Borrowings - Schedule of contractual maturity of borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total FHLB advances	$ 377,309	$ 799,364
Line of Credit and FHLB Advances
Debt Instrument [Line Items]
One year or less	228,725
After one year to two years	33,804
After two years to three years	38,602
After three years to four years	28,053
After four years	11,311
Total FHLB advances	$ 340,495