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Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Amortized cost and fair values of securities    
Less than 12 Months $ 924 $ 499
12 Months or More 2,800 3,232
Total 3,724 3,731
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss (6) (1)
12 Months or More (66) (28)
Unrealized Loss 72 29
Mortgage Backed Securities Residential [Member]    
Amortized cost and fair values of securities    
Less than 12 Months 924 0
12 Months or More 1,004 1,149
Total 1,928 1,149
Unrealized loss of securities    
Less than 12 Months, Unrealized Loss (6) 0
12 Months or More (55) (17)
Unrealized Loss 61 17
Collateralized mortgage obligations - residential [Member]    
Amortized cost and fair values of securities    
Less than 12 Months 0 0
12 Months or More 1,796 2,083
Total 1,796 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