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Securities - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]          
Available for sale securities carrying value pledged to secure public deposits $ 33,700   $ 33,700   $ 33,400
Gross gains on sales of securities available for sale 89 $ 64 353 $ 368  
Gross losses on sales of securities available for sale 1 $ 53 1 $ 101  
Fair value of available-for-sale securities 20,225   20,225   49,024
Unrealized loss of available-for-sale securities $ 171   171   $ 620
Held-to-maturity securities, realized gain (loss) on sale     $ 8    
Number of securities with unrealized losses, held-to-maturity | security 0   0   0
U.S. Government Agencies [Member]          
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]          
Number of securities with unrealized losses, available-for-sale | security 3   3   6
Fair value of available-for-sale securities $ 4,358   $ 4,358   $ 8,361
Unrealized loss of available-for-sale securities $ 49   $ 49   $ 55
State And Political Subdivisions [Member]          
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]          
Number of securities with unrealized losses, available-for-sale | security 1   1   15
Fair value of available-for-sale securities $ 597   $ 597   $ 8,778
Unrealized loss of available-for-sale securities $ 8   $ 8   $ 129
Number of securities with unrealized losses from state and political subdivisions maturity minimum number of years     10 years    
U.S. Government-Sponsored Enterprises [Member]          
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]          
Number of securities with unrealized losses, available-for-sale | security 9   9   18
Fair value of available-for-sale securities $ 15,270   $ 15,270   $ 31,885
Unrealized loss of available-for-sale securities $ 114   $ 114   $ 436
Corporate Debt [Member]          
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]          
Number of securities with unrealized losses, available-for-sale | security 0   0