SECURITIES - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-Sale, Amortized Cost
Due less than one year	$ 27,963
Due after one year through five years	269,064
Due after five years through ten years	387,471
Due greater than ten years	333,021
Mortgage-backed securities - residential	368,957
Mortgage-backed securities - commercial	251,865
Total	1,638,341
Available-for-Sale, Fair Value
Due less than one year	27,852
Due after one year through five years	257,549
Due after five years through ten years	350,647
Due greater than ten years	278,565
Mortgage-backed securities - residential	339,827
Mortgage-backed securities - commercial	234,807
Total	1,489,247
Held-to-maturity, Amortized Cost
Due less than one year	20,798
Due after one year through five years	109,904
Due after five years through ten years	35,543
Due greater than ten years	133,367
Mortgage-backed securities - residential	163,453
Mortgage-backed securities - commercial	130,089
Total	593,154
Held-to-maturity, Estimated Fair Value
Due less than one year	20,545
Due after one year through five years	106,351
Due after five years through ten years	33,601
Due greater than ten years	123,160
Mortgage-backed securities - residential	153,314
Mortgage-backed securities - commercial	124,362
Total	$ 561,333	$ 0

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