Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,417,585	$ 4,290,642
Gross Unrealized Gains	16,392	38,281
Gross Unrealized Losses	(141,829)	(126,705)
Fair Value	4,292,148	4,202,218
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	251,614	250,494
Gross Unrealized Gains	0	226
Gross Unrealized Losses	(24,616)	(22,233)
Fair Value	226,998	228,487
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,224	41,026
Gross Unrealized Gains	24	35
Gross Unrealized Losses	(1,549)	(1,117)
Fair Value	38,699	39,944
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,331	44,079
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(681)	(646)
Fair Value	42,650	43,433
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	184,575	181,883
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(29,874)	(31,937)
Fair Value	154,704	149,947
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	227,906	225,962
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(30,555)	(32,583)
Fair Value	197,354	193,380
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,653,256	3,541,284
Gross Unrealized Gains	14,329	36,238
Gross Unrealized Losses	(77,885)	(63,444)
Fair Value	3,589,700	3,514,078
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	244,585	231,876
Gross Unrealized Gains	2,036	1,781
Gross Unrealized Losses	(7,224)	(7,328)
Fair Value	$ 239,397	$ 226,329

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, after 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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