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	Jun. 30, 2026	Dec. 31, 2025
Debt securities available for sale
Amortized Cost	$ 2,419,023	$ 2,300,845
Unrealized gross gains	6,816	13,885
Unrealized gross losses	(160,672)	(152,182)
Fair Value	2,265,167	2,162,548
Debt securities held to maturity
Amortized Cost	703,988	746,385
Unrecognized gross gains	0	0
Unrecognized gross losses	(124,685)	(120,428)
Fair Value	579,303	625,957
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	106,962	111,876
Unrealized gross gains	0	250
Unrealized gross losses	(1,191)	(80)
Fair Value	105,771	112,046
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	276,467	270,682
Unrealized gross gains	2,894	3,089
Unrealized gross losses	(10,384)	(9,898)
Fair Value	268,977	263,873
Asset-backed securities
Debt securities available for sale
Amortized Cost	227,166	265,203
Unrealized gross gains	58	412
Unrealized gross losses	(218)	(35)
Fair Value	227,006	265,580
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	160,834	143,522
Unrealized gross gains	116	611
Unrealized gross losses	(11,828)	(11,191)
Fair Value	149,122	132,942
Debt securities held to maturity
Amortized Cost	340,073	367,825
Unrecognized gross gains	0	0
Unrecognized gross losses	(66,792)	(65,210)
Fair Value	273,281	302,615
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,604,567	1,464,347
Unrealized gross gains	3,435	9,336
Unrealized gross losses	(135,420)	(129,267)
Fair Value	1,472,582	1,344,416
Debt securities held to maturity
Amortized Cost	363,915	378,560
Unrecognized gross gains	0	0
Unrecognized gross losses	(57,893)	(55,218)
Fair Value	306,022	323,342
Corporate debt securities
Debt securities available for sale
Amortized Cost	43,027	45,215
Unrealized gross gains	313	187
Unrealized gross losses	(1,631)	(1,711)
Fair Value	$ 41,709	$ 43,691

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 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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