SECURITIES - Summary of Available For Sale and Held to Maturity Securities (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 1,204,415,000	$ 1,226,319,000
Gross Unrealized Gain	107,000	183,000
Gross Unrealized Losses	(190,041,000)	(174,774,000)
Allowance for Credit Losses	0	0
Fair Value	1,014,481,000	1,051,728,000
U.S. government sponsored agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	144,693,000	146,692,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(28,241,000)	(27,213,000)
Allowance for Credit Losses	0	0
Fair Value	116,452,000	119,479,000
Mortgage-backed securities: residential
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	511,037,000	522,275,000
Gross Unrealized Gain	86,000	118,000
Gross Unrealized Losses	(79,105,000)	(74,551,000)
Allowance for Credit Losses	0	0
Fair Value	432,018,000	447,842,000
State and municipal securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	548,685,000	557,352,000
Gross Unrealized Gain	21,000	65,000
Gross Unrealized Losses	(82,695,000)	(73,010,000)
Allowance for Credit Losses	0	0
Fair Value	$ 466,011,000	$ 484,407,000