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Securities (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Schedule of securities with unrealized losses    
Less than 12 Months, Fair Value $ 55,966 $ 41,785
Less than 12 Months, Unrealized Losses (1,027) (350)
12 Months or Longer, Fair Value 16,819 17,558
12 Months or Longer, Unrealized Losses (573) (427)
Total, Fair Value 72,785 59,343
Total, Unrealized Losses (1,600) (777)
U.S. Treasury and Government Agencies [Member]    
Schedule of securities with unrealized losses    
Less than 12 Months, Fair Value 7,424 5,675
Less than 12 Months, Unrealized Losses (121) (27)
12 Months or Longer, Fair Value 2,546 2,559
12 Months or Longer, Unrealized Losses (54) (42)
Total, Fair Value 9,970 8,234
Total, Unrealized Losses (175) (69)
Mortgage-backed securities [Member]    
Schedule of securities with unrealized losses    
Less than 12 Months, Fair Value 47,336 35,205
Less than 12 Months, Unrealized Losses (894) (319)
12 Months or Longer, Fair Value 13,953 14,673
12 Months or Longer, Unrealized Losses (500) (371)
Total, Fair Value 61,289 49,878
Total, Unrealized Losses (1,394) (690)
State and political subdivisions [Member]    
Schedule of securities with unrealized losses    
Less than 12 Months, Fair Value 1,206 905
Less than 12 Months, Unrealized Losses (12) (4)
12 Months or Longer, Fair Value 320 326
12 Months or Longer, Unrealized Losses (19) (14)
Total, Fair Value 1,526 1,231
Total, Unrealized Losses $ (31) $ (18)