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, 2026	Dec. 31, 2025
Debt securities available for sale
Amortized Cost	$ 2,367,021	$ 2,300,845
Unrealized gross gains	6,826	13,885
Unrealized gross losses	(158,580)	(152,182)
Fair Value	2,215,267	2,162,548
Debt securities held to maturity
Amortized Cost	725,540	746,385
Unrecognized gross gains	0	0
Unrecognized gross losses	(124,466)	(120,428)
Fair Value	601,074	625,957
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	109,005	111,876
Unrealized gross gains	245	250
Unrealized gross losses	(244)	(80)
Fair Value	109,006	112,046
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	271,311	270,682
Unrealized gross gains	862	3,089
Unrealized gross losses	(12,119)	(9,898)
Fair Value	260,054	263,873
Asset-backed securities
Debt securities available for sale
Amortized Cost	246,728	265,203
Unrealized gross gains	100	412
Unrealized gross losses	(322)	(35)
Fair Value	246,506	265,580
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	160,476	143,522
Unrealized gross gains	272	611
Unrealized gross losses	(11,293)	(11,191)
Fair Value	149,455	132,942
Debt securities held to maturity
Amortized Cost	354,095	367,825
Unrecognized gross gains	0	0
Unrecognized gross losses	(66,759)	(65,210)
Fair Value	287,336	302,615
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,537,318	1,464,347
Unrealized gross gains	5,104	9,336
Unrealized gross losses	(132,751)	(129,267)
Fair Value	1,409,671	1,344,416
Debt securities held to maturity
Amortized Cost	371,445	378,560
Unrecognized gross gains	0	0
Unrecognized gross losses	(57,707)	(55,218)
Fair Value	313,738	323,342
Corporate debt securities
Debt securities available for sale
Amortized Cost	42,183	45,215
Unrealized gross gains	243	187
Unrealized gross losses	(1,851)	(1,711)
Fair Value	$ 40,575	$ 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 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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