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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, 2024
Dec. 31, 2023
Fair Value    
Less than Twelve Months $ 1,483,442 $ 15,006
More than Twelve Months 1,126,912 1,192,879
Total 2,610,354 1,207,885
Unrealized Losses    
Less than Twelve Months (22,242) (30)
More than Twelve Months (164,370) (158,580)
Total (186,612) (158,610)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 291,549 288,156
Total 291,549 288,156
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (28,002) (25,615)
Total (28,002) (25,615)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 21,281 22,364
Total 21,281 22,364
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (2,113) (2,284)
Total (2,113) (2,284)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 6,208 8,276
Total 6,208 8,276
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (682) (588)
Total (682) (588)
Municipal bonds    
Fair Value    
Less than Twelve Months 0 1,019
More than Twelve Months 139,216 142,976
Total 139,216 143,995
Unrealized Losses    
Less than Twelve Months 0 (4)
More than Twelve Months (32,304) (26,261)
Total (32,304) (26,265)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 0 1,019
More than Twelve Months 145,424 151,252
Total 145,424 152,271
Unrealized Losses    
Less than Twelve Months 0 (4)
More than Twelve Months (32,986) (26,849)
Total (32,986) (26,853)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 1,483,442 9,010
More than Twelve Months 501,858 569,629
Total 1,985,300 578,639
Unrealized Losses    
Less than Twelve Months (22,242) (3)
More than Twelve Months (85,373) (78,028)
Total (107,615) (78,031)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 0 4,977
More than Twelve Months 166,800 161,478
Total 166,800 166,455
Unrealized Losses    
Less than Twelve Months 0 (23)
More than Twelve Months (15,896) (25,804)
Total $ (15,896) $ (25,827)