SECURITIES - Summary of Available For Sale and Held to Maturity Securities (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 1,296,759,000	$ 1,400,783,000
Gross Unrealized Gain	176,000	224,000
Gross Unrealized Losses	(188,654,000)	(215,479,000)
Allowance for Credit Losses	0	0
Fair Value	1,108,281,000	1,185,528,000
Information related to held-to-maturity securities
Amortized Cost	128,651,000	128,242,000
Allowance for credit losses for held-to-maturity	0	0
Fair Value	115,533,000	111,029,000
U.S. Treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	3,363,000	3,057,000
Gross Unrealized Gain	2,000	0
Gross Unrealized Losses	(13,000)	(23,000)
Allowance for Credit Losses	0	0
Fair Value	3,352,000	3,034,000
U.S. government sponsored agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	153,928,000	156,184,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(25,933,000)	(29,223,000)
Allowance for Credit Losses	0	0
Fair Value	127,995,000	126,961,000
Mortgage-backed securities: residential
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	561,865,000	578,175,000
Gross Unrealized Gain	81,000	67,000
Gross Unrealized Losses	(77,484,000)	(85,934,000)
Allowance for Credit Losses	0	0
Fair Value	484,462,000	492,308,000
State and municipal securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	577,603,000	663,367,000
Gross Unrealized Gain	93,000	157,000
Gross Unrealized Losses	(85,224,000)	(100,299,000)
Allowance for Credit Losses	0	0
Fair Value	492,472,000	563,225,000
Information related to held-to-maturity securities
Amortized Cost	128,651,000	128,242,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(13,118,000)	(17,213,000)
Allowance for credit losses for held-to-maturity	0	0
Fair Value	$ 115,533,000	$ 111,029,000

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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