INVESTMENT SECURITIES - Contractual maturities, Held to maturity (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Held to Maturity, Amortized Cost
Due in one year or less	$ 1
Due after one year through five years	45,259
Due after five years through ten years	26,486
Due after ten years	164,272
Total, Amortized Cost	236,018
Held to Maturity, Estimated Fair Value
Due in one year or less	1
Due after one year through five years	41,526
Due after five years through ten years	21,100
Due after ten years	130,656
Total, Estimated Fair Value	$ 193,283