Loans and Allowance for Loan and Lease Losses - Loan Balances and Related ALLL (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	$ 7,908		$ 2,711
Allowance for loans collectively evaluated for impairment	9,360		14,741
Total allowance	17,268	$ 17,127	17,452	$ 18,166	$ 17,520	$ 13,611
Loans individually evaluated for impairment	29,200		37,547
Loans collectively evaluated for impairment	1,082,491		1,186,310
Total	1,111,691		1,223,857
Commercial (excl PPP)
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	7,908		2,711
Allowance for loans collectively evaluated for impairment	4,378		8,544
Total allowance	12,286	10,623	11,255	11,487	11,218	8,883
Loans individually evaluated for impairment	23,882		30,886
Loans collectively evaluated for impairment	260,534		306,541
Total	284,416		337,427
Commercial loans - PPP
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	0		0
Total allowance	0	0	0	0	0	0
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	177,961		229,728
Total	177,961		229,728
Real Estate
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	2,758		3,964
Total allowance	2,758	4,453	3,964	4,733	4,368	2,897
Loans individually evaluated for impairment	5,318		6,661
Loans collectively evaluated for impairment	546,253		544,751
Total	551,571		551,412
Construction and land development loans
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	161		137
Total allowance	161	166	137	77	55	34
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	11,907		11,766
Total	11,907		11,766
Consumer and Single Family Mortgages
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	2,063		2,096
Total allowance	2,063	1,885	2,096	1,869	1,879	1,797
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	85,836		93,525
Total	85,836		93,525
Unallocated
Financing Receivable, Allowance for Credit Loss
Allowance for loans individually evaluated for impairment	0		0
Allowance for loans collectively evaluated for impairment	0		0
Total allowance	0	$ 0	0	$ 0	$ 0	$ 0
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	0		0
Total	$ 0		$ 0

PACIFIC MERCANTILE BANCORP 10-Q