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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)