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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, 2022
Dec. 31, 2021
Fair Value    
Less than Twelve Months $ 874,061 $ 459,944
More than Twelve Months 380,921 27,286
Total 1,254,982 487,230
Unrealized Losses    
Less than Twelve Months (97,008) (5,535)
More than Twelve Months (79,617) (999)
Total (176,625) (6,534)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 279,498  
More than Twelve Months 0  
Total 279,498  
Unrealized Losses    
Less than Twelve Months (28,639)  
More than Twelve Months 0  
Total (28,639)  
U.S. government agency securities    
Fair Value    
Less than Twelve Months 22,831 0
More than Twelve Months 1,116 1,326
Total 23,947 1,326
Unrealized Losses    
Less than Twelve Months (2,538) 0
More than Twelve Months (39) (6)
Total (2,577) (6)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 2,943 10,549
More than Twelve Months 7,462 0
Total 10,405 10,549
Unrealized Losses    
Less than Twelve Months (54) (93)
More than Twelve Months (439) 0
Total (493) (93)
Municipal bonds    
Fair Value    
Less than Twelve Months 112,029 19,100
More than Twelve Months 24,127 0
Total 136,156 19,100
Unrealized Losses    
Less than Twelve Months (26,044) (116)
More than Twelve Months (9,137) 0
Total (35,181) (116)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 114,972 29,649
More than Twelve Months 31,589 0
Total 146,561 29,649
Unrealized Losses    
Less than Twelve Months (26,098) (209)
More than Twelve Months (9,576) 0
Total (35,674) (209)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 311,836 371,256
More than Twelve Months 314,834 25,960
Total 626,670 397,216
Unrealized Losses    
Less than Twelve Months (27,152) (4,770)
More than Twelve Months (62,962) (993)
Total (90,114) (5,763)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 144,924 59,039
More than Twelve Months 33,382 0
Total 178,306 59,039
Unrealized Losses    
Less than Twelve Months (12,581) (556)
More than Twelve Months (7,040) 0
Total $ (19,621) $ (556)