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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, 2022
Dec. 31, 2021
Fair Value    
Less than Twelve Months $ 1,278,765 $ 459,944
More than Twelve Months 52,832 27,286
Total 1,331,597 487,230
Unrealized Losses    
Less than Twelve Months (105,914) (5,535)
More than Twelve Months (7,039) (999)
Total (112,953) (6,534)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months 292,397  
More than Twelve Months 0  
Total 292,397  
Unrealized Losses    
Less than Twelve Months (12,973)  
More than Twelve Months 0  
Total (12,973)  
U.S. government agency securities    
Fair Value    
Less than Twelve Months 26,224 0
More than Twelve Months 1,202 1,326
Total 27,426 1,326
Unrealized Losses    
Less than Twelve Months (575) 0
More than Twelve Months (17) (6)
Total (592) (6)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 9,315 10,549
More than Twelve Months 0 0
Total 9,315 10,549
Unrealized Losses    
Less than Twelve Months (331) (93)
More than Twelve Months 0 0
Total (331) (93)
Municipal bonds    
Fair Value    
Less than Twelve Months 141,951 19,100
More than Twelve Months 0 0
Total 141,951 19,100
Unrealized Losses    
Less than Twelve Months (28,916) (116)
More than Twelve Months 0 0
Total (28,916) (116)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 151,266 29,649
More than Twelve Months 0 0
Total 151,266 29,649
Unrealized Losses    
Less than Twelve Months (29,247) (209)
More than Twelve Months 0 0
Total (29,247) (209)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 660,060 371,256
More than Twelve Months 51,630 25,960
Total 711,690 397,216
Unrealized Losses    
Less than Twelve Months (52,782) (4,770)
More than Twelve Months (7,022) (993)
Total (59,804) (5,763)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 148,818 59,039
More than Twelve Months 0 0
Total 148,818 59,039
Unrealized Losses    
Less than Twelve Months (10,337) (556)
More than Twelve Months 0 0
Total $ (10,337) $ (556)