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Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized cost and fair values of securities    
Less than 12 Months $ 0 $ 499
12 Months or More 2,987 3,232
Total 2,987 3,731
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss 0 (1)
12 Months or More (60) (28)
Unrealized Loss 60 29
Mortgage Backed Securities Residential [Member]    
Amortized cost and fair values of securities    
Less than 12 Months 0 0
12 Months or More 1,097 1,149
Total 1,097 1,149
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss 0 0
12 Months or More (49) (17)
Unrealized Loss 49 17
Collateralized mortgage obligations - residential [Member]    
Amortized cost and fair values of securities    
Less than 12 Months 0 0
12 Months or More 1,890 2,083
Total 1,890 2,083
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss 0 0
12 Months or More (11) (11)
Unrealized Loss $ 11 11
Equity Funds [Member]    
Amortized cost and fair values of securities    
Less than 12 Months   499
12 Months or More   0
Total   499
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss   (1)
12 Months or More   0
Unrealized Loss   $ 1