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Investment Securities (Details 2) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Held to maturity securities:    
Held-to-maturity Securities, Duration of Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 12
Held-to-maturity Securities, Duration of Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss   0
Held-to-maturity Securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Fair Value   9
Held-to-maturity Securities, Duration of Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss   0
Held-to-maturity Securities, Duration of Unrealized Loss Position, Fair Value   21
Held-to-maturity Securities, Duration of Unrealized Loss Position, Gross Unrealized Loss   0
Total temporarily impaired securities, Duration Unrealized Loss Position, Less Than Twelve Months, Fair Value $ 155,896 92,314
Total temporarily impaired securities, Duration of Unrealized Loss Position, Less Than 12 Months, Gross Unrealized Loss (3,252) (705)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Fair Value 37,797 43,729
Total temporarily impaired securities, Duration of Unrealized Loss Position, Twelve Months or Longer, Gross Unrealized Loss (2,043) (1,257)
Total temporarily impaired securities, Duration of Unrealized Loss Position, Fair Value 193,693 136,043
Total temporarily impaired securities, Duration of Unrealized Loss Position, Unrealized Loss (5,295) (1,962)
Collateralized mortgage obligations [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 79,785 49,107
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (1,522) (320)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 16,590 20,804
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (849) (572)
Available-for-sale securities, Total, Fair Value 96,375 69,911
Available-for-sale securities, Total, Unrealized Loss (2,371) (892)
Obligations of state and political subdivisions [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 24,211 14,249
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (615) (163)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 3,296 3,370
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (203) (127)
Available-for-sale securities, Total, Fair Value 27,507 17,619
Available-for-sale securities, Total, Unrealized Loss (818) (290)
Mortgage-backed securities - residential [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 46,958 27,881
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (1,093) (215)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 17,413 19,038
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (970) (548)
Available-for-sale securities, Total, Fair Value 64,371 46,919
Available-for-sale securities, Total, Unrealized Loss (2,063) (763)
REMICs [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 2,952 1,065
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (12) (7)
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 0 0
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss 0 0
Available-for-sale securities, Total, Fair Value 2,952 1,065
Available-for-sale securities, Total, Unrealized Loss (12) (7)
Obligations of U.S. government corporations and agencies [Member]    
Available-for-sale securities, Duration of Unrealized Loss Position, Less than 12 Month, Fair Value 1,990 0
Available-for-sale Securities, Duration of Unrealized Loss Position, Less than 12 Month, Gross Unrealized Loss (10) 0
Available-for-sale securities, Duration of Unrealized Loss Position, 12 Month or Longer, Fair Value 498 508
Available-for-sale Securities, Duration of Unrealized Loss Position, 12 Month or Longer, Gross Unrealized Loss (21) (10)
Available-for-sale securities, Total, Fair Value 2,488 508
Available-for-sale securities, Total, Unrealized Loss $ (31) $ (10)