INVESTMENT SECURITIES, Contractual or Expected Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Maturity in years [Abstract]
Due in one year or less	$ 22,255
Due after one year through five years	171,580
Due after five years through ten years	44,081
Due after ten years	27,030
Subtotal	264,946
MBS & CMO	412,105
Amortized cost	677,051	$ 636,092
Maturity in years [Abstract]
Due in one year or less	22,316
Due after one year through five years	165,608
Due after five years through ten years	41,114
Due after ten years	24,916
Subtotal	253,954
MBS & CMO	391,201
Estimated fair value	$ 645,155	$ 632,213