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Investment Securities - Unrealized Losses and Fair Value Debt Securities Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value    
Less than Twelve Months $ 153,479 $ 289,110
More than Twelve Months 52,031 306,513
Total 205,510 595,623
Unrealized Losses    
Less than Twelve Months (1,360) (1,347)
More than Twelve Months (514) (4,235)
Total (1,874) (5,582)
U.S. Treasury securities    
Fair Value    
Less than Twelve Months   25,019
More than Twelve Months   0
Total   25,019
Unrealized Losses    
Less than Twelve Months   (21)
More than Twelve Months   0
Total   (21)
U.S. government agency securities    
Fair Value    
Less than Twelve Months 0 0
More than Twelve Months 1,627 1,783
Total 1,627 1,783
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (28) (19)
Total (28) (19)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 24,913 18,540
More than Twelve Months 1,036 8,755
Total 25,949 27,295
Unrealized Losses    
Less than Twelve Months (37) (21)
More than Twelve Months (17) (62)
Total (54) (83)
Municipal bonds    
Fair Value    
Less than Twelve Months 210 0
More than Twelve Months 0 13,177
Total 210 13,177
Unrealized Losses    
Less than Twelve Months (1) 0
More than Twelve Months 0 (86)
Total (1) (86)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 25,123 18,540
More than Twelve Months 1,036 21,932
Total 26,159 40,472
Unrealized Losses    
Less than Twelve Months (38) (21)
More than Twelve Months (17) (148)
Total (55) (169)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 101,162 240,412
More than Twelve Months 49,368 282,798
Total 150,530 523,210
Unrealized Losses    
Less than Twelve Months (458) (1,194)
More than Twelve Months (469) (4,068)
Total (927) (5,262)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 27,194 5,139
More than Twelve Months 0 0
Total 27,194 5,139
Unrealized Losses    
Less than Twelve Months (864) (111)
More than Twelve Months 0 0
Total $ (864) $ (111)