DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Securities available-for-sale:
Amortized Cost	$ 4,136,857	$ 3,980,151
Gross Unrealized Gains	33,126	52,604
Gross Unrealized Losses	(50,768)	(39,370)
Fair Value	4,119,215	3,993,385
Securities held-to-maturity
Amortized Cost	1,286,813	1,336,632
Gross Unrealized Gains	506	545
Gross Unrealized Losses	(167,231)	(166,359)
Fair Value	1,120,088	1,170,818
Obligations of states and political subdivisions
Securities available-for-sale:
Amortized Cost	453,017	458,290
Gross Unrealized Gains	11,503	13,518
Gross Unrealized Losses	(1,800)	(649)
Fair Value	462,720	471,159
Securities held-to-maturity
Amortized Cost	13,030	12,902
Gross Unrealized Gains	506	545
Gross Unrealized Losses	(12)	(6)
Fair Value	13,524	13,441
Mortgage-backed securities - residential
Securities available-for-sale:
Amortized Cost	3,016,269	2,871,733
Gross Unrealized Gains	19,221	36,881
Gross Unrealized Losses	(34,295)	(24,325)
Fair Value	3,001,195	2,884,289
Securities held-to-maturity
Amortized Cost	962,717	1,012,716
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(134,393)	(134,994)
Fair Value	828,324	877,722
Mortgage-backed securities - commercial
Securities available-for-sale:
Amortized Cost	364,721	381,934
Gross Unrealized Gains	776	1,622
Gross Unrealized Losses	(12,893)	(11,750)
Fair Value	352,604	371,806
Securities held-to-maturity
Amortized Cost	311,066	311,014
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(32,826)	(31,359)
Fair Value	278,240	279,655
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	230,500	188,500
Gross Unrealized Gains	104	1
Gross Unrealized Losses	(22)	(185)
Fair Value	230,582	188,316
Corporate bonds
Securities available-for-sale:
Amortized Cost	45,243	51,828
Gross Unrealized Gains	1,522	527
Gross Unrealized Losses	(1,382)	(2,440)
Fair Value	45,383	49,915
U.S. Treasury securities
Securities available-for-sale:
Amortized Cost	20,674	20,623
Gross Unrealized Gains	0	46
Gross Unrealized Losses	(250)	0
Fair Value	20,424	20,669
Agency debentures
Securities available-for-sale:
Amortized Cost	6,433	7,243
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(126)	(21)
Fair Value	$ 6,307	$ 7,231

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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