SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Available-for-Sale and Related Gross Unrealized Gains and Losses (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 1,189,135,000	$ 1,182,501,000
Gross Unrealized Gain	555,000	100,000
Gross Unrealized Losses	(188,815,000)	(191,175,000)
Allowance for Credit Losses	0	0
Fair Value	1,000,875,000	991,426,000
U.S. government sponsored agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	139,872,000	137,150,000
Gross Unrealized Gain	44,000	0
Gross Unrealized Losses	(24,798,000)	(27,715,000)
Allowance for Credit Losses	0	0
Fair Value	115,118,000	109,435,000
Mortgage-backed securities: residential
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	505,416,000	500,278,000
Gross Unrealized Gain	494,000	83,000
Gross Unrealized Losses	(66,992,000)	(77,952,000)
Allowance for Credit Losses	0	0
Fair Value	438,918,000	422,409,000
State and municipal securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	543,847,000	545,073,000
Gross Unrealized Gain	17,000	17,000
Gross Unrealized Losses	(97,025,000)	(85,508,000)
Allowance for Credit Losses	0	0
Fair Value	$ 446,839,000	$ 459,582,000