Note 5 - Loans and Allowance for Loan Losses - Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable	$ 2,498,848	$ 2,409,047	$ 2,409,047
Commercial Portfolio Segment [Member]
Financing Receivable	1,971,742	1,893,762
Commercial Portfolio Segment [Member] \| Pass [Member]
Financing Receivable	1,943,222	1,862,658
Commercial Portfolio Segment [Member] \| Special Mention [Member]
Financing Receivable	20,174	21,011
Commercial Portfolio Segment [Member] \| Classified [Member]
Financing Receivable	8,346	10,093
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Financing Receivable	454,952	387,401
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Pass [Member]
Financing Receivable	447,136	378,592
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Special Mention [Member]
Financing Receivable	7,094	7,229
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member] \| Classified [Member]
Financing Receivable	722	1,580
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member]
Financing Receivable	361,213	367,553
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Pass [Member]
Financing Receivable	351,049	356,214
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Special Mention [Member]
Financing Receivable	6,533	7,779
Commercial Portfolio Segment [Member] \| CRE - Owner Occupied [Member] \| Classified [Member]
Financing Receivable	3,631	3,560
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member]
Financing Receivable	801,698	743,107
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Pass [Member]
Financing Receivable	794,561	735,698
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Special Mention [Member]
Financing Receivable	3,878	3,276
Commercial Portfolio Segment [Member] \| CRE - Investor Income Producing [Member] \| Classified [Member]
Financing Receivable	3,259	4,133
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member]
Financing Receivable	95,236	82,707
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Pass [Member]
Financing Receivable	95,236	82,707
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Special Mention [Member]
Financing Receivable	0	0
Commercial Portfolio Segment [Member] \| AC&D - 1 - 4 Family Construction [Member] \| Classified [Member]
Financing Receivable		0
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member]
Financing Receivable	92,761	105,362
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Pass [Member]
Financing Receivable	91,415	102,146
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Special Mention [Member]
Financing Receivable	938	2,727
Commercial Portfolio Segment [Member] \| AC&D - Lots, Land, & Development [Member] \| Classified [Member]
Financing Receivable	408	489
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member]
Financing Receivable	150,170	194,732
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Pass [Member]
Financing Receivable	150,170	194,732
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Special Mention [Member]
Financing Receivable	0	0
Commercial Portfolio Segment [Member] \| AC&D - CRE [Member] \| Classified [Member]
Financing Receivable		0
Commercial Portfolio Segment [Member] \| Other Commercial [Member]
Financing Receivable	15,712	12,900
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Pass [Member]
Financing Receivable	13,655	12,569
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Special Mention [Member]
Financing Receivable	1,731	0
Commercial Portfolio Segment [Member] \| Other Commercial [Member] \| Classified [Member]
Financing Receivable	326	331
Consumer Portfolio Segment [Member]
Financing Receivable	527,106	515,285
Consumer Portfolio Segment [Member] \| Pass [Member]
Financing Receivable	509,594	498,591
Consumer Portfolio Segment [Member] \| Special Mention [Member]
Financing Receivable	11,323	10,765
Consumer Portfolio Segment [Member] \| Classified [Member]
Financing Receivable	6,189	5,929
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member]
Financing Receivable	283,911	260,521
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Pass [Member]
Financing Receivable	275,473	252,934
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Special Mention [Member]
Financing Receivable	5,012	4,707
Consumer Portfolio Segment [Member] \| Residential Mortgage Loans [Member] \| Classified [Member]
Financing Receivable	3,426	2,880
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member]
Financing Receivable	173,840	176,799
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Pass [Member]
Financing Receivable	165,280	168,460
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Special Mention [Member]
Financing Receivable	6,247	5,732
Consumer Portfolio Segment [Member] \| Home Equity Lines of Credit [Member] \| Classified [Member]
Financing Receivable	2,313	2,607
Consumer Portfolio Segment [Member] \| Residential Construction [Member]
Financing Receivable	52,222	59,060
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Pass [Member]
Financing Receivable	51,887	58,486
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Special Mention [Member]
Financing Receivable	31	312
Consumer Portfolio Segment [Member] \| Residential Construction [Member] \| Classified [Member]
Financing Receivable	304	262
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member]
Financing Receivable	17,133	18,905
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Pass [Member]
Financing Receivable	16,954	18,711
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Special Mention [Member]
Financing Receivable	33	14
Consumer Portfolio Segment [Member] \| Other Loans to Individuals [Member] \| Classified [Member]
Financing Receivable	$ 146	$ 180

Park Sterling Corp 10-Q