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DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Securities available-for-sale:
Amortized Cost	$ 3,952,753	$ 3,980,151
Gross Unrealized Gains	29,170	52,604
Gross Unrealized Losses	(48,218)	(39,370)
Fair Value	3,933,705	3,993,385
Securities held-to-maturity
Amortized Cost	1,313,520	1,336,632
Gross Unrealized Gains	401	545
Gross Unrealized Losses	(163,952)	(166,359)
Fair Value	1,149,969	1,170,818
Obligations of states and political subdivisions
Securities available-for-sale:
Amortized Cost	454,978	458,290
Gross Unrealized Gains	6,612	13,518
Gross Unrealized Losses	(1,721)	(649)
Fair Value	459,869	471,159
Securities held-to-maturity
Amortized Cost	12,967	12,902
Gross Unrealized Gains	401	545
Gross Unrealized Losses	(9)	(6)
Fair Value	13,359	13,441
Mortgage-backed securities - residential
Securities available-for-sale:
Amortized Cost	2,818,727	2,871,733
Gross Unrealized Gains	20,363	36,881
Gross Unrealized Losses	(31,371)	(24,325)
Fair Value	2,807,719	2,884,289
Securities held-to-maturity
Amortized Cost	989,514	1,012,716
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(132,144)	(134,994)
Fair Value	857,370	877,722
Mortgage-backed securities - commercial
Securities available-for-sale:
Amortized Cost	369,056	381,934
Gross Unrealized Gains	1,210	1,622
Gross Unrealized Losses	(12,285)	(11,750)
Fair Value	357,981	371,806
Securities held-to-maturity
Amortized Cost	311,039	311,014
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(31,799)	(31,359)
Fair Value	279,240	279,655
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	230,500	188,500
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(792)	(185)
Fair Value	229,708	188,316
Corporate bonds
Securities available-for-sale:
Amortized Cost	52,028	51,828
Gross Unrealized Gains	985	527
Gross Unrealized Losses	(1,878)	(2,440)
Fair Value	51,135	49,915
U.S. Treasury securities
Securities available-for-sale:
Amortized Cost	20,648	20,623
Gross Unrealized Gains	0	46
Gross Unrealized Losses	(112)	0
Fair Value	20,536	20,669
Agency debentures
Securities available-for-sale:
Amortized Cost	6,816	7,243
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(59)	(21)
Fair Value	$ 6,757	$ 7,231

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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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