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Securities - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months $ 1,258 $ 6,927
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 24,651 29,589
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 25,909 36,516
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months (10) (52)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (295) (581)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (305) (633)
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value    
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months   1,545
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 3,085 6,761
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Total 3,085 8,306
Debt securities, Held-to-maturity securities, Continuous unrealized loss position, accumulated loss    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (5)
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (11) (98)
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (11) (103)
U.S. government agency mortgage-backed securities    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months   2,354
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 12,625 15,223
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 12,625 17,577
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months   (6)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (156) (265)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (156) (271)
U.S. government agency collateralized mortgage obligations    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months 1,258 2,636
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 5,614 5,620
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 6,872 8,256
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months (10) (14)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (104) (128)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (114) (142)
State and municipal securities    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months   957
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 5,420 8,746
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 5,420 9,703
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months   (11)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (27) (188)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (27) (199)
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value    
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months   1,545
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 1,098 4,783
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Total 1,098 6,328
Debt securities, Held-to-maturity securities, Continuous unrealized loss position, accumulated loss    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (5)
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (4) (85)
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (4) (90)
Investments in mutual funds    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Less than 12 Months   980
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 992  
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total 992 980
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Less than 12 Months   (21)
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (8)  
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total (8) (21)
U.S. Treasuries    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value    
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer 1,987  
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Available-for-sale securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer (7)  
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value    
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, 12 Months or Longer   1,978
Held-to-maturity securities, Continuous Unrealized Loss Position, Fair Value, Total 1,987 1,978
Debt securities, Held-to-maturity securities, Continuous unrealized loss position, accumulated loss    
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, 12 Months or Longer   (13)
Held-to-maturity securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total $ (7) $ (13)