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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value    
Less than 12 Months $ 688,631 $ 1,483,442
More than 12 Months 1,122,076 1,126,912
Total 1,810,707 2,610,354
Unrealized Losses    
Less than 12 Months (8,848) (22,242)
More than 12 Months (153,182) (164,370)
Total (162,030) (186,612)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 296,253 291,549
Total 296,253 291,549
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (24,756) (28,002)
Total (24,756) (28,002)
U.S. government agency securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 21,158 21,281
Total 21,158 21,281
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (1,472) (2,113)
Total (1,472) (2,113)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 5,938 6,208
Total 5,938 6,208
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (840) (682)
Total (840) (682)
Municipal bonds    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 134,643 139,216
Total 134,643 139,216
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (37,555) (32,304)
Total (37,555) (32,304)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 140,581 145,424
Total 140,581 145,424
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (38,395) (32,986)
Total (38,395) (32,986)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 683,881 1,483,442
More than 12 Months 499,009 501,858
Total 1,182,890 1,985,300
Unrealized Losses    
Less than 12 Months (8,598) (22,242)
More than 12 Months (74,832) (85,373)
Total (83,430) (107,615)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 4,750 0
More than 12 Months 165,075 166,800
Total 169,825 166,800
Unrealized Losses    
Less than 12 Months (250) 0
More than 12 Months (13,727) (15,896)
Total $ (13,977) $ (15,896)