Allowance for Loan and Lease Losses (ALLL) - Troubled Debt Restructuring (Details) - Organic Loans $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	3	0
Pre-Modification Outstanding Recorded Investment	$ 5,570	$ 0
Post-Modification Outstanding Recorded Investment	$ 5,570	$ 0
Total commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	2	0
Pre-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Total commercial real estate \| Construction, land & land development
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Total commercial real estate \| Other commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	2	0
Pre-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Commercial & industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Owner-occupied real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	0
Pre-Modification Outstanding Recorded Investment	$ 2,769	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,769	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0

STATE BANK FINANCIAL CORP 10-Q