Loans and Allowance for Credit Losses - Purchase and Sale of loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Loans and Allowance for Loan Losses
Repurchases of SBA participations	$ 1,773	$ 631	$ 5,140	$ 2,789
SBA Sales	12,298	11,539	25,437	17,938
Total Loans	14,071	12,170	30,577	20,727
Loans sold, delinquent amount	3,700		3,700		$ 8,400
Commercial and industrial
Loans and Allowance for Loan Losses
Repurchases of SBA participations	411	631	1,070	1,322
SBA Sales	8,052	10,205	16,266	16,169
Total Loans	8,463	10,836	17,336	17,491
Commercial real estate
Loans and Allowance for Loan Losses
Repurchases of SBA participations			2,708	1,467
SBA Sales	3,582	1,334	8,507	1,492
Total Loans	3,582	$ 1,334	11,215	2,959
Residential mortgages
Loans and Allowance for Loan Losses
Repurchases of SBA participations	1,362		1,362
SBA Sales	664		664	277
Total Loans	$ 2,026		$ 2,026	$ 277