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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	Sep. 30, 2025	Dec. 31, 2024
Debt securities available for sale
Amortized Cost	$ 2,251,731	$ 2,039,952
Gross unrealized gains	9,753	594
Gross unrealized losses	(162,225)	(230,325)
Fair Value	2,099,259	1,810,221
Debt securities held to maturity
Amortized Cost	784,821	826,630
Gross unrecognized gains	0	0
Gross unrecognized losses	(125,350)	(151,577)
Fair Value	659,471	675,053
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	113,676	1,408
Gross unrealized gains	124	0
Gross unrealized losses	(195)	(8)
Fair Value	113,605	1,400
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	259,470	156,534
Gross unrealized gains	655	31
Gross unrealized losses	(12,581)	(16,736)
Fair Value	247,544	139,829
Asset-backed securities
Debt securities available for sale
Amortized Cost	285,052	336,379
Gross unrealized gains	510	181
Gross unrealized losses	0	(3)
Fair Value	285,562	336,557
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	147,183	107,305
Gross unrealized gains	541	0
Gross unrealized losses	(11,743)	(15,131)
Fair Value	135,981	92,174
Debt securities held to maturity
Amortized Cost	398,375	415,530
Gross unrecognized gains	0	0
Gross unrecognized losses	(68,743)	(77,242)
Fair Value	329,632	338,288
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,395,849	1,279,090
Gross unrealized gains	7,513	19
Gross unrealized losses	(135,786)	(191,899)
Fair Value	1,267,576	1,087,210
Debt securities held to maturity
Amortized Cost	386,446	411,100
Gross unrecognized gains	0	0
Gross unrecognized losses	(56,607)	(74,335)
Fair Value	329,839	336,765
Corporate debt securities
Debt securities available for sale
Amortized Cost	50,501	159,236
Gross unrealized gains	410	363
Gross unrealized losses	(1,920)	(6,548)
Fair Value	$ 48,991	$ 153,051

X

- Definition

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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