Other noninterest expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Data processing expenses	$ 13,952	$ 12,671	$ 10,879
Office expenses	4,396	4,610	6,203
Loan appraisal, servicing, and collection expenses	4,043	3,558	2,189
Professional fees	4,506	3,446	6,253
Advertising and marketing expenses	3,124	2,397	2,782
Insurance expenses	3,537	2,373	1,463
Travel and entertainment	2,526	1,634	3,227
Automated teller machine (ATM) and interchange expenses	1,176	1,109	1,647
Deposit expenses and other operational losses	1,024	548	1,777
Other	3,358	3,546	3,746
Total other noninterest expenses	$ 41,642	$ 35,892	$ 40,166