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Investment Securities - Unrealized Losses and Fair Value Debt Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value    
Less than Twelve Months $ 68,127 $ 289,110
More than Twelve Months 74,532 306,513
Total 142,659 595,623
Unrealized Losses    
Less than Twelve Months (2,325) (1,347)
More than Twelve Months (740) (4,235)
Total (3,065) (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 1,682 1,783
Total 1,682 1,783
Unrealized Losses    
Less than Twelve Months 0 0
More than Twelve Months (33) (19)
Total (33) (19)
Obligations of states and state agencies    
Fair Value    
Less than Twelve Months 3,582 18,540
More than Twelve Months 4,661 8,755
Total 8,243 27,295
Unrealized Losses    
Less than Twelve Months (152) (21)
More than Twelve Months (42) (62)
Total (194) (83)
Municipal bonds    
Fair Value    
Less than Twelve Months 3,222 0
More than Twelve Months 8,616 13,177
Total 11,838 13,177
Unrealized Losses    
Less than Twelve Months (13) 0
More than Twelve Months (71) (86)
Total (84) (86)
Obligations of states and political subdivisions    
Fair Value    
Less than Twelve Months 6,804 18,540
More than Twelve Months 13,277 21,932
Total 20,081 40,472
Unrealized Losses    
Less than Twelve Months (165) (21)
More than Twelve Months (113) (148)
Total (278) (169)
Residential mortgage-backed securities    
Fair Value    
Less than Twelve Months 38,175 240,412
More than Twelve Months 59,573 282,798
Total 97,748 523,210
Unrealized Losses    
Less than Twelve Months (243) (1,194)
More than Twelve Months (594) (4,068)
Total (837) (5,262)
Corporate and other debt securities    
Fair Value    
Less than Twelve Months 23,148 5,139
More than Twelve Months 0 0
Total 23,148 5,139
Unrealized Losses    
Less than Twelve Months (1,917) (111)
More than Twelve Months 0 0
Total $ (1,917) $ (111)