Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 454
Due after one year through five years	71,981
Due after five years through ten years	121,335
Due after ten years	160,381
Total amortized cost	354,151
Mortgage-backed securities	339,028
Amortized cost	693,179		$ 946,511
Fair Value
Due in one year or less	454
Due after one year through five years	69,718
Due after five years through ten years	113,599
Due after ten years	147,956
Total fair value	331,727
Mortgage-backed securities	321,565
Fair value	653,292		$ 938,164
Amortized Cost
Due in one year or less	0
Due after one year through five years	6,678
Due after five years through ten years	45,654
Due after ten years	73,467
Total amortized cost	125,799
Mortgage-backed securities	181,210
Amortized cost	307,009
Fair Value
Due in one year or less	0
Due after one year through five years	6,505
Due after five years through ten years	43,466
Due after ten years	67,986
Total fair value	117,957
Mortgage-backed securities	170,853
Fair value	$ 288,810	$ 309,700