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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, 2021
Dec. 31, 2020
Fair Value    
Less than Twelve Months $ 319,114 $ 60,712
More than Twelve Months 13,413 30,400
Total 332,527 91,112
Unrealized Losses    
Less than Twelve Months (2,911) (601)
More than Twelve Months (345) (318)
Total (3,256) (919)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 1,355 1,479
Total 1,355 1,479
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (7) (13)
Total (7) (13)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 10,344 0
More than Twelve Months 0 1,010
Total 10,344 1,010
Unrealized Losses    
Less than Twelve Months (39) 0
More than Twelve Months 0 (32)
Total (39) (32)
Municipal bonds    
Fair Value    
Less than Twelve Months 25,100 6,777
More than Twelve Months 0 0
Total 25,100 6,777
Unrealized Losses    
Less than Twelve Months (429) (69)
More than Twelve Months 0 0
Total (429) (69)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 35,444 6,777
More than Twelve Months 0 1,010
Total 35,444 7,787
Unrealized Losses    
Less than Twelve Months (468) (69)
More than Twelve Months 0 (32)
Total (468) (101)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 264,495 41,418
More than Twelve Months 12,058 27,911
Total 276,553 69,329
Unrealized Losses    
Less than Twelve Months (2,138) (500)
More than Twelve Months (338) (273)
Total (2,476) (773)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 19,175 12,517
More than Twelve Months 0 0
Total 19,175 12,517
Unrealized Losses    
Less than Twelve Months (305) (32)
More than Twelve Months 0 0
Total $ (305) $ (32)