SECURITIES - Summary of Available For Sale Securities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,400,783,000	$ 1,376,969,000
Gross Unrealized Gain	224,000	30,244,000
Gross Unrealized Losses	(215,479,000)	(8,655,000)
Allowance for Credit Losses	0	0
Fair Value	1,185,528,000	1,398,558,000
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	128,242,000	0
Allowance for Credit Losses	0
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	3,057,000	900,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(23,000)	0
Allowance for Credit Losses	0	0
Fair Value	3,034,000	900,000
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized Cost	156,184,000	145,858,000
Gross Unrealized Gain	0	39,000
Gross Unrealized Losses	(29,223,000)	(2,445,000)
Allowance for Credit Losses	0	0
Fair Value	126,961,000	143,452,000
Mortgage-backed securities: residential
Schedule of Available-for-sale Securities
Amortized Cost	578,175,000	487,157,000
Gross Unrealized Gain	67,000	4,455,000
Gross Unrealized Losses	(85,934,000)	(4,936,000)
Allowance for Credit Losses	0	0
Fair Value	492,308,000	486,676,000
Mortgage-backed securities: commercial
Schedule of Available-for-sale Securities
Amortized Cost	0	522,000
Gross Unrealized Gain	0	1,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	0	523,000
State and municipal securities
Schedule of Available-for-sale Securities
Amortized Cost	663,367,000	742,532,000
Gross Unrealized Gain	157,000	25,749,000
Gross Unrealized Losses	(100,299,000)	(1,274,000)
Allowance for Credit Losses	0	0
Fair Value	563,225,000	$ 767,007,000
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	128,242,000
Gross Unrealized Gain	0
Gross Unrealized Losses	(17,213,000)
Allowance for Credit Losses	0
Fair Value	$ 111,029,000