INVESTMENT SECURITIES, Contractual or Expected Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Maturity in years [Abstract]
Due in one year or less	$ 89,660
Due after one year through five years	135,601
Due after five years through ten years	24,901
Due after ten years	26,610
Subtotal	276,772
Mortgage-backed securities & Collateralized mortgage obligations	360,131
Amortized cost	636,903	$ 683,784
Maturity in years [Abstract]
Due in one year or less	87,943
Due after one year through five years	125,056
Due after five years through ten years	21,549
Due after ten years	21,878
Subtotal	256,426
Mortgage-backed securities & Collateralized mortgage obligations	310,983
Estimated fair value	$ 567,409	$ 618,092