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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, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months $ 558,073 $ 874,061
More than 12 Months 695,069 380,921
Total 1,253,142 1,254,982
Unrealized Losses    
Less than 12 Months (55,449) (97,008)
More than 12 Months (97,428) (79,617)
Total (152,877) (176,625)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 286,745 279,498
More than 12 Months 0 0
Total 286,745 279,498
Unrealized Losses    
Less than 12 Months (22,779) (28,639)
More than 12 Months 0 0
Total (22,779) (28,639)
U.S. government agency securities    
Fair Value    
Less than 12 Months 12,003 22,831
More than 12 Months 11,371 1,116
Total 23,374 23,947
Unrealized Losses    
Less than 12 Months (1,238) (2,538)
More than 12 Months (850) (39)
Total (2,088) (2,577)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 2,231 2,943
More than 12 Months 7,766 7,462
Total 9,997 10,405
Unrealized Losses    
Less than 12 Months (17) (54)
More than 12 Months (635) (439)
Total (652) (493)
Municipal bonds    
Fair Value    
Less than 12 Months 114,299 112,029
More than 12 Months 28,229 24,127
Total 142,528 136,156
Unrealized Losses    
Less than 12 Months (20,463) (26,044)
More than 12 Months (7,978) (9,137)
Total (28,441) (35,181)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 116,530 114,972
More than 12 Months 35,995 31,589
Total 152,525 146,561
Unrealized Losses    
Less than 12 Months (20,480) (26,098)
More than 12 Months (8,613) (9,576)
Total (29,093) (35,674)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 34,170 311,836
More than 12 Months 582,739 314,834
Total 616,909 626,670
Unrealized Losses    
Less than 12 Months (1,506) (27,152)
More than 12 Months (77,992) (62,962)
Total (79,498) (90,114)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 108,625 144,924
More than 12 Months 64,964 33,382
Total 173,589 178,306
Unrealized Losses    
Less than 12 Months (9,446) (12,581)
More than 12 Months (9,973) (7,040)
Total $ (19,419) $ (19,621)