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Available-for-Sale Securities (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Summary of securities with unrealized losses    
Less than 12 Months, Fair Value $ 41,785 $ 51,483
Less than 12 Months, Unrealized Losses (350) (698)
12 Months or Longer, Fair Value 17,558 703
12 Months or Longer, Unrealized Losses (427) (29)
Total Fair Value 59,343 52,186
Total Unrealized Losses (777) (727)
U.S. Treasury and Government agencies [Member]    
Summary of securities with unrealized losses    
Less than 12 Months, Fair Value 5,675 6,044
Less than 12 Months, Unrealized Losses (27) (52)
12 Months or Longer, Fair Value 2,559
12 Months or Longer, Unrealized Losses (42)
Total Fair Value 8,234 6,044
Total Unrealized Losses (69) (52)
Mortgage-backed securities [Member]    
Summary of securities with unrealized losses    
Less than 12 Months, Fair Value 35,205 44,344
Less than 12 Months, Unrealized Losses (319) (607)
12 Months or Longer, Fair Value 14,673 703
12 Months or Longer, Unrealized Losses (371) (29)
Total Fair Value 49,878 45,047
Total Unrealized Losses (690) (636)
State and political subdivisions [Member]    
Summary of securities with unrealized losses    
Less than 12 Months, Fair Value 905 1,095
Less than 12 Months, Unrealized Losses (4) (39)
12 Months or Longer, Fair Value 326
12 Months or Longer, Unrealized Losses (14)
Total Fair Value 1,231 1,095
Total Unrealized Losses $ (18) $ (39)