DEBT SECURITIES - Schedule of Amortized Cost, Unrealized or Unrecognized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt securities available for sale
Amortized Cost	$ 2,464,241	$ 2,039,952
Gross unrealized gains	2,930	594
Gross unrealized losses	(193,297)	(230,325)
Fair Value	2,273,874	1,810,221
Debt securities held to maturity
Amortized Cost	815,402	826,630
Gross unrecognized gains	0	0
Gross unrecognized losses	(136,932)	(151,577)
Fair Value	678,470	675,053
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	219	1,408
Gross unrealized gains	0	0
Gross unrealized losses	(2)	(8)
Fair Value	217	1,400
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	262,377	156,534
Gross unrealized gains	90	31
Gross unrealized losses	(18,603)	(16,736)
Fair Value	243,864	139,829
Asset-backed securities
Debt securities available for sale
Amortized Cost	342,584	336,379
Gross unrealized gains	92	181
Gross unrealized losses	0	(3)
Fair Value	342,676	336,557
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	93,488	107,305
Gross unrealized gains	98	0
Gross unrealized losses	(12,762)	(15,131)
Fair Value	80,824	92,174
Debt securities held to maturity
Amortized Cost	411,680	415,530
Gross unrecognized gains	0	0
Gross unrecognized losses	(71,458)	(77,242)
Fair Value	340,222	338,288
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,651,857	1,279,090
Gross unrealized gains	2,285	19
Gross unrealized losses	(158,626)	(191,899)
Fair Value	1,495,516	1,087,210
Debt securities held to maturity
Amortized Cost	403,722	411,100
Gross unrecognized gains	0	0
Gross unrecognized losses	(65,474)	(74,335)
Fair Value	338,248	336,765
Corporate debt securities
Debt securities available for sale
Amortized Cost	113,716	159,236
Gross unrealized gains	365	363
Gross unrealized losses	(3,304)	(6,548)
Fair Value	$ 110,777	$ 153,051

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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Amortized cost excluding accrued interest, before allowance for credit loss, 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 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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Amount of accumulated unrealized loss 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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