Investment Securities - Schedule of Unrealized Loss on Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair value
Less than 12 months	$ 419,704	$ 1,471,434
12 months or more	1,479,874	2,793,730
Total	1,899,578	4,265,164
Unrealized losses
Less than 12 months	(1,190)	(14,309)
12 months or more	(103,392)	(184,284)
Total	(104,582)	(198,593)
U.S. government obligations and government- sponsored enterprises
Fair value
Less than 12 months	419,704	1,468,478
12 months or more	1,469,113	2,757,421
Total	1,888,817	4,225,899
Unrealized losses
Less than 12 months	(1,190)	(14,293)
12 months or more	(103,318)	(183,418)
Total	(104,508)	(197,711)
Obligations of states and political subdivisions
Fair value
Less than 12 months	0	2,239
12 months or more	7,204	9,618
Total	7,204	11,856
Unrealized losses
Less than 12 months	0	(16)
12 months or more	(38)	(195)
Total	(38)	(211)
Other securities
Fair value
Less than 12 months	0	717
12 months or more	3,557	26,691
Total	3,557	27,409
Unrealized losses
Less than 12 months	0	0
12 months or more	(36)	(671)
Total	$ (36)	$ (671)