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Investment Securities - Unrealized Losses and Fair Value Debt Securities Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value    
Less than Twelve Months $ 134,715 $ 289,110
More than Twelve Months 35,954 306,513
Total 170,669 595,623
Unrealized Losses    
Less than Twelve Months (943) (1,347)
More than Twelve Months (458) (4,235)
Total (1,401) (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 1,585 1,783
Total 1,585 1,783
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (18) (19)
Total (18) (19)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 1,319 18,540
More than Twelve Months 1,023 8,755
Total 2,342 27,295
Unrealized Losses    
Less than Twelve Months (6) (21)
More than Twelve Months (24) (62)
Total (30) (83)
Municipal bonds    
Fair Value    
Less than Twelve Months 6,767 0
More than Twelve Months 0 13,177
Total 6,767 13,177
Unrealized Losses    
Less than Twelve Months (74) 0
More than Twelve Months 0 (86)
Total (74) (86)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 8,086 18,540
More than Twelve Months 1,023 21,932
Total 9,109 40,472
Unrealized Losses    
Less than Twelve Months (80) (21)
More than Twelve Months (24) (148)
Total (104) (169)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 111,973 240,412
More than Twelve Months 33,346 282,798
Total 145,319 523,210
Unrealized Losses    
Less than Twelve Months (526) (1,194)
More than Twelve Months (416) (4,068)
Total (942) (5,262)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 14,656 5,139
More than Twelve Months 0 0
Total 14,656 5,139
Unrealized Losses    
Less than Twelve Months (337) (111)
More than Twelve Months 0 0
Total $ (337) $ (111)