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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,290,642	$ 3,552,273
Gross Unrealized Gains	38,281	4,063
Gross Unrealized Losses	(126,705)	(186,612)
Fair Value	4,202,218	3,369,724
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	250,494	319,551
Gross Unrealized Gains	226	0
Gross Unrealized Losses	(22,233)	(28,002)
Fair Value	228,487	291,549
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,026	24,636
Gross Unrealized Gains	35	20
Gross Unrealized Losses	(1,117)	(2,113)
Fair Value	39,944	22,543
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	44,079	46,211
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(646)	(682)
Fair Value	43,433	45,529
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	181,883	179,284
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(31,937)	(32,304)
Fair Value	149,947	146,980
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	225,962	225,495
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(32,583)	(32,986)
Fair Value	193,380	192,509
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,541,284	2,784,895
Gross Unrealized Gains	36,238	3,796
Gross Unrealized Losses	(63,444)	(107,615)
Fair Value	3,514,078	2,681,076
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,876	197,696
Gross Unrealized Gains	1,781	247
Gross Unrealized Losses	(7,328)	(15,896)
Fair Value	$ 226,329	$ 182,047

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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