SECURITIES - Summary of Available For Sale Securities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,226,319,000	$ 1,400,783,000
Gross Unrealized Gain	183,000	224,000
Gross Unrealized Losses	(174,774,000)	(215,479,000)
Allowance for Credit Losses	0	0
Fair Value	1,051,728,000	1,185,528,000
Schedule of Held-to-Maturity Securities [Line Items]
Fair Value	129,918,000
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost		3,057,000
Gross Unrealized Gain		0
Gross Unrealized Losses		(23,000)
Allowance for Credit Losses		0
Fair Value		3,034,000
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	146,692,000	156,184,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(27,213,000)	(29,223,000)
Allowance for Credit Losses	0	0
Fair Value	119,479,000	126,961,000
Mortgage-backed securities: residential
Schedule of Available-for-sale Securities
Amortized Cost	522,275,000	578,175,000
Gross Unrealized Gain	118,000	67,000
Gross Unrealized Losses	(74,551,000)	(85,934,000)
Allowance for Credit Losses	0	0
Fair Value	447,842,000	492,308,000
State and municipal securities
Schedule of Available-for-sale Securities
Amortized Cost	557,352,000	663,367,000
Gross Unrealized Gain	65,000	157,000
Gross Unrealized Losses	(73,010,000)	(100,299,000)
Allowance for Credit Losses	0	0
Fair Value	484,407,000	563,225,000
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	129,918,000	128,242,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(10,703,000)	(17,213,000)
Allowance for Credit Losses	0	0
Fair Value	$ 119,215,000	$ 111,029,000