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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, 2022
Dec. 31, 2021
Fair Value    
Less than Twelve Months $ 818,503 $ 459,944
More than Twelve Months 40,435 27,286
Total 858,938 487,230
Unrealized Losses    
Less than Twelve Months (39,634) (5,535)
More than Twelve Months (3,220) (999)
Total (42,854) (6,534)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 13,880 0
More than Twelve Months 1,292 1,326
Total 15,172 1,326
Unrealized Losses    
Less than Twelve Months (140) 0
More than Twelve Months (8) (6)
Total (148) (6)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 10,153 10,549
More than Twelve Months 0 0
Total 10,153 10,549
Unrealized Losses    
Less than Twelve Months (310) (93)
More than Twelve Months 0 0
Total (310) (93)
Municipal bonds    
Fair Value    
Less than Twelve Months 31,523 19,100
More than Twelve Months 0 0
Total 31,523 19,100
Unrealized Losses    
Less than Twelve Months (4,371) (116)
More than Twelve Months 0 0
Total (4,371) (116)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 41,676 29,649
More than Twelve Months 0 0
Total 41,676 29,649
Unrealized Losses    
Less than Twelve Months (4,681) (209)
More than Twelve Months 0 0
Total (4,681) (209)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 688,282 371,256
More than Twelve Months 39,143 25,960
Total 727,425 397,216
Unrealized Losses    
Less than Twelve Months (31,427) (4,770)
More than Twelve Months (3,212) (993)
Total (34,639) (5,763)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 74,665 59,039
More than Twelve Months 0 0
Total 74,665 59,039
Unrealized Losses    
Less than Twelve Months (3,386) (556)
More than Twelve Months 0 0
Total $ (3,386) $ (556)