DEBT SECURITIES - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 2,334,630	$ 2,772,453
Unrealized gross gains	186	144
Unrealized gross losses	(247,245)	(311,204)
Fair Value	2,087,571	2,461,393
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	872,628	918,312
Unrealized gross gains	0	0
Unrealized gross losses	(142,231)	(133,017)
Fair Value	730,397	785,295
U.S. Treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	16,031	117,805
Unrealized gross gains	0	0
Unrealized gross losses	(85)	(3,744)
Fair Value	15,946	114,061
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	5,889	20,097
Unrealized gross gains	1	3
Unrealized gross losses	(58)	(321)
Fair Value	5,832	19,779
Obligations of states and political subdivisions
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	190,819	283,481
Unrealized gross gains	52	106
Unrealized gross losses	(18,026)	(26,075)
Fair Value	172,845	257,512
Asset-backed securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	470,046	489,558
Unrealized gross gains	0	0
Unrealized gross losses	(1,823)	(19,683)
Fair Value	468,223	469,875
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	119,044	124,423
Unrealized gross gains	0	0
Unrealized gross losses	(15,535)	(16,029)
Fair Value	103,509	108,394
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	428,526	474,820
Unrealized gross gains	0	0
Unrealized gross losses	(71,000)	(63,738)
Fair Value	357,526	411,082
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	1,306,854	1,463,971
Unrealized gross gains	5	2
Unrealized gross losses	(195,547)	(220,717)
Fair Value	1,111,312	1,243,256
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	444,102	443,492
Unrealized gross gains	0	0
Unrealized gross losses	(71,231)	(69,279)
Fair Value	372,871	374,213
Corporate debt securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	225,947	273,118
Unrealized gross gains	128	33
Unrealized gross losses	(16,171)	(24,635)
Fair Value	$ 209,904	$ 248,516

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 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 of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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