Investment Securities, Contractual and Expected Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Maturity in years [Abstract]
Due in one year or less	$ 15,115
Due after one year through five years	151,898
Due after five years through ten years	40,443
Due after ten years	28,026
Subtotal	235,482
MBS & CMO	400,610
Amortized cost	636,092	$ 424,981
Maturity in years [Abstract]
Due in one year or less	15,279
Due after one year through five years	151,022
Due after five years through ten years	39,822
Due after ten years	28,683
Subtotal	234,806
MBS & CMO	397,407
Estimated fair value	$ 632,213	$ 435,080