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Investment Securities (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value    
Less than 12 months $ 92,909 $ 93,280
12 months or more 114,021 114,649
Total 206,930 207,929
Unrealized Losses    
Less than 12 months (1,634) (785)
12 months or more (3,754) (2,537)
Total (5,388) (3,322)
U.S. Treasury    
Fair Value    
Less than 12 months 1,939 1,967
12 months or more 0 0
Total 1,939 1,967
Unrealized Losses    
Less than 12 months (42) (13)
12 months or more 0 0
Total (42) (13)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 0 0
12 months or more 11,493 12,073
Total 11,493 12,073
Unrealized Losses    
Less than 12 months 0 0
12 months or more (305) (268)
Total (305) (268)
Government sponsored enterprises    
Fair Value    
Less than 12 months 14,881 16,471
12 months or more 23,295 20,426
Total 38,176 36,897
Unrealized Losses    
Less than 12 months (218) (119)
12 months or more (424) (305)
Total (642) (424)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 22,906 22,013
12 months or more 12,379 12,570
Total 35,285 34,583
Unrealized Losses    
Less than 12 months (260) (165)
12 months or more (449) (312)
Total (709) (477)
Mortgage-backed securities | Residential - government agencies    
Fair Value    
Less than 12 months 53,183 52,829
12 months or more 66,854 69,580
Total 120,037 122,409
Unrealized Losses    
Less than 12 months (1,114) (488)
12 months or more (2,576) (1,652)
Total $ (3,690) $ (2,140)