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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value
Less than Twelve Months	$ 131,004	$ 1,483,442
More than Twelve Months	1,078,814	1,126,912
Total	1,209,818	2,610,354
Unrealized Losses
Less than Twelve Months	(243)	(22,242)
More than Twelve Months	(126,462)	(164,370)
Total	(126,705)	(186,612)
U.S. Treasury securities
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	128,232	291,549
Total	128,232	291,549
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(22,233)	(28,002)
Total	(22,233)	(28,002)
U.S. government agency securities
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	20,754	21,281
Total	20,754	21,281
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(1,117)	(2,113)
Total	(1,117)	(2,113)
Obligations of states and state agencies
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	5,453	6,208
Total	5,453	6,208
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(646)	(682)
Total	(646)	(682)
Municipal bonds
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	141,083	139,216
Total	141,083	139,216
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(31,937)	(32,304)
Total	(31,937)	(32,304)
Obligations of states and political subdivisions
Fair Value
Less than Twelve Months	0	0
More than Twelve Months	146,536	145,424
Total	146,536	145,424
Unrealized Losses
Less than Twelve Months	0	0
More than Twelve Months	(32,583)	(32,986)
Total	(32,583)	(32,986)
Residential mortgage-backed securities
Fair Value
Less than Twelve Months	118,263	1,483,442
More than Twelve Months	650,985	501,858
Total	769,248	1,985,300
Unrealized Losses
Less than Twelve Months	(234)	(22,242)
More than Twelve Months	(63,210)	(85,373)
Total	(63,444)	(107,615)
Corporate and other debt securities
Fair Value
Less than Twelve Months	12,741	0
More than Twelve Months	132,307	166,800
Total	145,048	166,800
Unrealized Losses
Less than Twelve Months	(9)	0
More than Twelve Months	(7,319)	(15,896)
Total	$ (7,328)	$ (15,896)

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