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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, 2022
Dec. 31, 2021
Fair Value    
Less than Twelve Months $ 962,066 $ 459,944
More than Twelve Months 299,793 27,286
Total 1,261,859 487,230
Unrealized Losses    
Less than Twelve Months (126,371) (5,535)
More than Twelve Months (66,727) (999)
Total (193,098) (6,534)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 277,902  
More than Twelve Months 0  
Total 277,902  
Unrealized Losses    
Less than Twelve Months (28,846)  
More than Twelve Months 0  
Total (28,846)  
U.S. government agency securities    
Fair Value    
Less than Twelve Months 22,614 0
More than Twelve Months 1,142 1,326
Total 23,756 1,326
Unrealized Losses    
Less than Twelve Months (2,720) 0
More than Twelve Months (38) (6)
Total (2,758) (6)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 4,402 10,549
More than Twelve Months 7,610 0
Total 12,012 10,549
Unrealized Losses    
Less than Twelve Months (56) (93)
More than Twelve Months (509) 0
Total (565) (93)
Municipal bonds    
Fair Value    
Less than Twelve Months 119,722 19,100
More than Twelve Months 9,305 0
Total 129,027 19,100
Unrealized Losses    
Less than Twelve Months (40,475) (116)
More than Twelve Months (3,547) 0
Total (44,022) (116)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 124,124 29,649
More than Twelve Months 16,915 0
Total 141,039 29,649
Unrealized Losses    
Less than Twelve Months (40,531) (209)
More than Twelve Months (4,056) 0
Total (44,587) (209)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 376,683 371,256
More than Twelve Months 266,591 25,960
Total 643,274 397,216
Unrealized Losses    
Less than Twelve Months (39,604) (4,770)
More than Twelve Months (58,344) (993)
Total (97,948) (5,763)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 160,743 59,039
More than Twelve Months 15,145 0
Total 175,888 59,039
Unrealized Losses    
Less than Twelve Months (14,670) (556)
More than Twelve Months (4,289) 0
Total $ (18,959) $ (556)