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Investment Securities (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Fair Value, Less than 12 Months $ 59,420 $ 34,850
Fair Value, 12 Months or More 72,577 76,214
Fair Value, Total 131,997 111,064
Unrealized Losses    
Unrealized Losses, Less than 12 Months 1,655 303
Unrealized Losses, 12 Months or More 3,653 2,705
Unrealized Losses, Total 5,308 3,008
U.S. Government agencies and corporations    
Fair Value    
Fair Value, Less than 12 Months 6,195  
Fair Value, 12 Months or More 2,757 2,860
Fair Value, Total 8,952 2,860
Unrealized Losses    
Unrealized Losses, Less than 12 Months 40  
Unrealized Losses, 12 Months or More 243 140
Unrealized Losses, Total 283 140
Obligations of states and political subdivisions    
Fair Value    
Fair Value, Less than 12 Months 31,631 7,430
Fair Value, 12 Months or More 17,746 18,066
Fair Value, Total 49,377 25,496
Unrealized Losses    
Unrealized Losses, Less than 12 Months 869 24
Unrealized Losses, 12 Months or More 821 300
Unrealized Losses, Total 1,690 324
U.S. Government-sponsored mortgage-backed securities    
Fair Value    
Fair Value, Less than 12 Months 21,594 24,888
Fair Value, 12 Months or More 37,864 40,968
Fair Value, Total 59,458 65,856
Unrealized Losses    
Unrealized Losses, Less than 12 Months 746 241
Unrealized Losses, 12 Months or More 1,971 1,163
Unrealized Losses, Total 2,717 1,404
U.S. Government-sponsored collateralized mortgage obligations    
Fair Value    
Fair Value, 12 Months or More 5,746 6,302
Fair Value, Total 5,746 6,302
Unrealized Losses    
Unrealized Losses, 12 Months or More 236 161
Unrealized Losses, Total 236 161
U.S. Government-guaranteed small business administration pools    
Fair Value    
Fair Value, Less than 12 Months   2,532
Fair Value, 12 Months or More 8,464 7,123
Fair Value, Total 8,464 9,655
Unrealized Losses    
Unrealized Losses, Less than 12 Months   38
Unrealized Losses, 12 Months or More 382 218
Unrealized Losses, Total $ 382 256
Trust preferred securities    
Fair Value    
Fair Value, 12 Months or More   895
Fair Value, Total   895
Unrealized Losses    
Unrealized Losses, 12 Months or More   723
Unrealized Losses, Total   $ 723