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Investment Securities - Age of Unrealized Losses and Fair Value of Related Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value
Less than Twelve Months	$ 61,548	$ 328,108
More than Twelve Months	2,377,489	2,492,592
Total	2,439,037	2,820,700
Unrealized Losses
Less than Twelve Months	(2,119)	(3,761)
More than Twelve Months	(376,465)	(502,282)
Total	(378,584)	(506,043)
U.S. Treasury securities
Fair Value
Less than Twelve Months		25,461
More than Twelve Months		0
Total		25,461
Unrealized Losses
Less than Twelve Months		(19)
More than Twelve Months		0
Total		(19)
U.S. government agency securities
Fair Value
Less than Twelve Months	0	22,621
More than Twelve Months	235,027	229,143
Total	235,027	251,764
Unrealized Losses
Less than Twelve Months	0	(75)
More than Twelve Months	(39,226)	(48,938)
Total	(39,226)	(49,013)
Obligations of states and state agencies
Fair Value
Less than Twelve Months	8,974	20,632
More than Twelve Months	32,537	42,058
Total	41,511	62,690
Unrealized Losses
Less than Twelve Months	(161)	(517)
More than Twelve Months	(3,132)	(4,818)
Total	(3,293)	(5,335)
Municipal bonds
Fair Value
Less than Twelve Months	18,237	36,766
More than Twelve Months	176,687	210,723
Total	194,924	247,489
Unrealized Losses
Less than Twelve Months	(1,777)	(440)
More than Twelve Months	(15,518)	(20,362)
Total	(17,295)	(20,802)
Total obligations of states and political subdivisions
Fair Value
Less than Twelve Months	27,211	57,398
More than Twelve Months	209,224	252,781
Total	236,435	310,179
Unrealized Losses
Less than Twelve Months	(1,938)	(957)
More than Twelve Months	(18,650)	(25,180)
Total	(20,588)	(26,137)
Residential mortgage-backed securities
Fair Value
Less than Twelve Months	23,866	216,651
More than Twelve Months	1,837,989	1,917,644
Total	1,861,855	2,134,295
Unrealized Losses
Less than Twelve Months	(152)	(2,687)
More than Twelve Months	(311,663)	(417,895)
Total	(311,815)	(420,582)
Trust preferred securities
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	30,689	29,145
Total	30,689	29,145
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(5,414)	(6,936)
Total	(5,414)	(6,936)
Corporate and other debt securities
Fair Value
Less than Twelve Months	10,471	5,977
More than Twelve Months	64,560	63,879
Total	75,031	69,856
Unrealized Losses
Less than Twelve Months	(29)	(23)
More than Twelve Months	(1,512)	(3,333)
Total	$ (1,541)	$ (3,356)

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