INVESTMENT SECURITIES, Contractual or Expected Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Maturity in years [Abstract]
Due in one year or less	$ 17,585
Due after one year through five years	82,350
Due after five years through ten years	65,385
Due after ten years	18,262
Subtotal	183,582
MBS & CMO	278,221
Amortized cost	461,803	$ 424,981
Maturity in years [Abstract]
Due in one year or less	17,746
Due after one year through five years	83,346
Due after five years through ten years	64,322
Due after ten years	18,838
Subtotal	184,252
MBS & CMO	281,794
Estimated fair value	$ 466,046	$ 435,080