Servicing Assets and Liabilities - Changes in SBA/USDA loans servicing rights (Details) - SBA/USDA loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Servicing rights roll forward
Beginning of period	$ 6,462	$ 6,794	$ 7,510
Acquired servicing rights	581	0	0
Originated servicing rights capitalized upon sale of loans	2,005	1,114	1,835
Disposals	(1,430)	(624)	(1,258)
Changes in fair value due to change in inputs or assumptions used in the valuation	(1,105)	(822)	(1,293)
End of period	$ 6,513	$ 6,462	$ 6,794