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DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available-for-sale:
Amortized Cost	$ 3,495,649	$ 3,140,305
Gross Unrealized Gains	39,236	2,828
Gross Unrealized Losses	(44,407)	(77,882)
Fair Value	3,490,478	3,065,251
Securities held-to-maturity
Amortized Cost	1,363,636	1,440,494
Gross Unrealized Gains	503	509
Gross Unrealized Losses	(177,879)	(245,003)
Fair Value	1,186,260	1,196,000
Obligations of states and political subdivisions
Securities available-for-sale:
Amortized Cost	459,834	91,799
Gross Unrealized Gains	8,954	699
Gross Unrealized Losses	(918)	(1,199)
Fair Value	467,870	91,299
Securities held-to-maturity
Amortized Cost	15,082	14,193
Gross Unrealized Gains	503	509
Gross Unrealized Losses	(9)	(30)
Fair Value	15,576	14,672
Mortgage-backed securities - residential
Securities available-for-sale:
Amortized Cost	2,373,146	2,694,745
Gross Unrealized Gains	28,273	2,107
Gross Unrealized Losses	(27,264)	(53,164)
Fair Value	2,374,155	2,643,688
Securities held-to-maturity
Amortized Cost	1,037,566	1,115,389
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(144,497)	(196,949)
Fair Value	893,069	918,440
Mortgage-backed securities - commercial
Securities available-for-sale:
Amortized Cost	389,469	259,793
Gross Unrealized Gains	1,402	22
Gross Unrealized Losses	(12,693)	(18,953)
Fair Value	378,178	240,862
Securities held-to-maturity
Amortized Cost	310,988	310,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(33,373)	(48,024)
Fair Value	277,615	262,888
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	188,500	50,000
Gross Unrealized Gains	189	0
Gross Unrealized Losses	0	0
Fair Value	188,689	50,000
Corporate bonds
Securities available-for-sale:
Amortized Cost	56,558	43,968
Gross Unrealized Gains	417	0
Gross Unrealized Losses	(3,491)	(4,566)
Fair Value	53,484	$ 39,402
U.S. Treasury securities
Securities available-for-sale:
Amortized Cost	20,597
Gross Unrealized Gains	0
Gross Unrealized Losses	(18)
Fair Value	20,579
Agency debentures
Securities available-for-sale:
Amortized Cost	7,545
Gross Unrealized Gains	1
Gross Unrealized Losses	(23)
Fair Value	$ 7,523

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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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