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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value    
Less than 12 Months $ 678,989 $ 1,483,442
More than 12 Months 1,127,905 1,126,912
Total 1,806,894 2,610,354
Unrealized Losses    
Less than 12 Months (7,576) (22,242)
More than 12 Months (152,286) (164,370)
Total (159,862) (186,612)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 298,070 291,549
Total 298,070 291,549
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (24,423) (28,002)
Total (24,423) (28,002)
U.S. government agency securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 21,179 21,281
Total 21,179 21,281
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (1,471) (2,113)
Total (1,471) (2,113)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 5,744 6,208
Total 5,744 6,208
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (836) (682)
Total (836) (682)
Municipal bonds    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 131,768 139,216
Total 131,768 139,216
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (41,114) (32,304)
Total (41,114) (32,304)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 137,512 145,424
Total 137,512 145,424
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (41,950) (32,986)
Total (41,950) (32,986)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 674,361 1,483,442
More than 12 Months 505,120 501,858
Total 1,179,481 1,985,300
Unrealized Losses    
Less than 12 Months (7,204) (22,242)
More than 12 Months (72,557) (85,373)
Total (79,761) (107,615)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 4,628 0
More than 12 Months 166,024 166,800
Total 170,652 166,800
Unrealized Losses    
Less than 12 Months (372) 0
More than 12 Months (11,885) (15,896)
Total $ (12,257) $ (15,896)