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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value    
Less than 12 Months $ 226,129 $ 1,483,442
More than 12 Months 1,320,482 1,126,912
Total 1,546,611 2,610,354
Unrealized Losses    
Less than 12 Months (498) (22,242)
More than 12 Months (136,535) (164,370)
Total (137,033) (186,612)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 301,335 291,549
Total 301,335 291,549
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (22,639) (28,002)
Total (22,639) (28,002)
U.S. government agency securities    
Fair Value    
Less than 12 Months 17,958 0
More than 12 Months 20,614 21,281
Total 38,572 21,281
Unrealized Losses    
Less than 12 Months (43) 0
More than 12 Months (1,249) (2,113)
Total (1,292) (2,113)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 5,741 6,208
Total 5,741 6,208
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (646) (682)
Total (646) (682)
Municipal bonds    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 137,577 139,216
Total 137,577 139,216
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (34,745) (32,304)
Total (34,745) (32,304)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 143,318 145,424
Total 143,318 145,424
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (35,391) (32,986)
Total (35,391) (32,986)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 189,309 1,483,442
More than 12 Months 706,670 501,858
Total 895,979 1,985,300
Unrealized Losses    
Less than 12 Months (367) (22,242)
More than 12 Months (67,783) (85,373)
Total (68,150) (107,615)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 18,862 0
More than 12 Months 148,545 166,800
Total 167,407 166,800
Unrealized Losses    
Less than 12 Months (88) 0
More than 12 Months (9,473) (15,896)
Total $ (9,561) $ (15,896)