SECURITIES - Contractual maturities of debt securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 8,031
Due after one but within five years	45,010
Due after five but within ten years	88,684
Due after ten years	407,323
Total of securities having specified maturity period	549,048
Mortgage-backed securities and collateralized mortgage obligations	949,578
Amortized Cost	1,498,626	$ 1,339,570
Fair Value
Due in one year or less	7,984
Due after one but within five years	43,566
Due after five but within ten years	83,055
Due after ten years	362,466
Total of securities having specified maturities period	497,071
Mortgage-backed securities and collateralized mortgage obligations	833,410
TOTAL	1,330,481	1,359,514
TOTAL	$ 1,330,481	$ 1,359,514