INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 6,745
Due from one year to five years	339,429
Due from five to ten years	31,462
Due after ten years	32,206
Mortgage-backed securities	658,508
Amortized Cost	1,068,350	$ 572,887
Estimated Fair Value
Due in one year or less	6,754
Due from one year to five years	337,279
Due from five to ten years	31,085
Due after ten years	30,649
Mortgage-backed securities	646,501
Estimated Fair Value	1,052,268	592,621
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five to ten years	0
Due after ten years	31,905
Mortgage-backed securities	79,749
Amortized Cost	111,654	79,850
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five to ten years	0
Due after ten years	27,626
Mortgage-backed securities	69,518
Estimated Fair Value	$ 97,144	$ 78,206