INVESTMENT SECURITIES, Contractual or Expected Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Maturity in years [Abstract]
Due in one year or less	$ 16,109
Due after one year through five years	111,664
Due after five years through ten years	55,291
Due after ten years	22,404
Subtotal	205,468
MBS & CMO	351,642
Amortized cost	557,110	$ 424,981
Maturity in years [Abstract]
Due in one year or less	16,274
Due after one year through five years	112,446
Due after five years through ten years	55,165
Due after ten years	23,189
Subtotal	207,074
MBS & CMO	354,485
Estimated fair value	$ 561,559	$ 435,080