SECURITIES - Summary of Available For Sale and Held to Maturity Securities (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 1,448,323,000	$ 1,376,969,000
Gross Unrealized Gain	90,000	30,244,000
Gross Unrealized Losses	(256,227,000)	(8,655,000)
Allowance for Credit Losses	0	0
Fair Value	1,192,186,000	1,398,558,000
Information related to held-to-maturity securities
Amortized Cost	127,820,000	0
Fair Value	103,326,000	0
Allowance for credit losses for held-to-maturity	0
U.S. Treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	1,994,000	900,000
Gross Unrealized Gain	0	0
Gross Unrealized Losses	(26,000)	0
Allowance for Credit Losses	0	0
Fair Value	1,968,000	900,000
U.S. government sponsored agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	159,169,000	145,858,000
Gross Unrealized Gain	0	39,000
Gross Unrealized Losses	(27,914,000)	(2,445,000)
Allowance for Credit Losses	0	0
Fair Value	131,255,000	143,452,000
Mortgage-backed securities: residential
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	597,258,000	487,157,000
Gross Unrealized Gain	80,000	4,455,000
Gross Unrealized Losses	(92,582,000)	(4,936,000)
Allowance for Credit Losses	0	0
Fair Value	504,756,000	486,676,000
Mortgage-backed securities: commercial
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost		522,000
Gross Unrealized Gain		1,000
Gross Unrealized Losses		0
Allowance for Credit Losses		0
Fair Value		523,000
State and municipal securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	689,902,000	742,532,000
Gross Unrealized Gain	10,000	25,749,000
Gross Unrealized Losses	(135,705,000)	(1,274,000)
Allowance for Credit Losses	0	0
Fair Value	554,207,000	$ 767,007,000
Information related to held-to-maturity securities
Amortized Cost	127,820,000
Gross Unrealized Gain	0
Gross Unrealized Losses	(24,494,000)
Allowance for Credit Losses	0
Fair Value	$ 103,326,000

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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