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Investment Securities (Details 5)
$ in Thousands
Sep. 30, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Held-to-maturity Securities [Abstract]    
Less than Twelve Months Number of individual securities | Securities 9 10
Less than Twelve Months, Unrealized Losses $ 35 $ 16
Less than Twelve Months, Fair Value $ 2,748 $ 1,574
Twelve Months or More Number of individual securities | Securities 13 6
Twelve Months or More, Unrealized Losses $ 53 $ 21
Twelve Months or More, Fair Value $ 2,026 $ 1,502
Total Number of Individual Securities | Securities 22 16
Total Unrealized Losses $ 88 $ 37
Fair Value $ 4,774 $ 3,076
Mortgage-backed securities - residential    
Held-to-maturity Securities [Abstract]    
Less than Twelve Months Number of individual securities | Securities [1] 0 0
Less than Twelve Months, Unrealized Losses [1] $ 0 $ 0
Less than Twelve Months, Fair Value [1] $ 0 $ 0
Twelve Months or More Number of individual securities | Securities [1] 1 1
Twelve Months or More, Unrealized Losses [1] $ 0 $ 0
Twelve Months or More, Fair Value [1] $ 166 $ 171
Total Number of Individual Securities | Securities [1] 1 1
Total Unrealized Losses [1] $ 0 $ 0
Fair Value [1] $ 166 $ 171
State and municipal securities    
Held-to-maturity Securities [Abstract]    
Less than Twelve Months Number of individual securities | Securities 9 10
Less than Twelve Months, Unrealized Losses $ 35 $ 16
Less than Twelve Months, Fair Value $ 2,748 $ 1,574
Twelve Months or More Number of individual securities | Securities 12 5
Twelve Months or More, Unrealized Losses $ 53 $ 21
Twelve Months or More, Fair Value $ 1,860 $ 1,331
Total Number of Individual Securities | Securities 21 15
Total Unrealized Losses $ 88 $ 37
Fair Value $ 4,608 $ 2,905
[1] Aggregate unrealized loss position of these securities is less than $500.