FAIR VALUE DISCLOSURES - Assets and Liabilities Measured At Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Total securities available-for-sale	$ 975,532	$ 1,185,528
Mortgage banking derivative	42,035	36,920
Fair Value, Measurements, Recurring
Assets:
U.S. Treasury securities	2,861	3,034
U.S. government sponsored agency securities	115,671	126,961
Mortgage-backed securities: residential	429,662	492,308
State and municipal securities	427,338	563,225
Total securities available-for-sale	975,532	1,185,528
Mortgage banking derivative	66	43
Interest rate swap derivative	42,035	36,920
Total assets	1,017,633	1,222,491
Liabilities:
Interest rate swap derivative	42,036	36,921
Total liabilities	42,036	36,921
Level 1 | Fair Value, Measurements, Recurring
Assets:
U.S. Treasury securities	2,861	3,034
U.S. government sponsored agency securities	0	0
Mortgage-backed securities: residential	0	0
State and municipal securities	0	0
Total securities available-for-sale	2,861	3,034
Mortgage banking derivative	0	0
Interest rate swap derivative	0	0
Total assets	2,861	3,034
Liabilities:
Interest rate swap derivative	0	0
Total liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets:
U.S. Treasury securities	0	0
U.S. government sponsored agency securities	115,671	126,961
Mortgage-backed securities: residential	429,662	492,308
State and municipal securities	425,348	561,150
Total securities available-for-sale	970,681	1,180,419
Mortgage banking derivative	66	43
Interest rate swap derivative	42,035	36,920
Total assets	1,012,782	1,217,382
Liabilities:
Interest rate swap derivative	42,036	36,921
Total liabilities	42,036	36,921
Level 3 | Fair Value, Measurements, Recurring
Assets:
U.S. Treasury securities	0	0
U.S. government sponsored agency securities	0	0
Mortgage-backed securities: residential	0	0
State and municipal securities	1,990	2,075
Total securities available-for-sale	1,990	2,075
Mortgage banking derivative	0	0
Interest rate swap derivative	0	0
Total assets	1,990	2,075
Liabilities:
Interest rate swap derivative	0	0
Total liabilities	$ 0	$ 0