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Investment Securities - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
security
state
Dec. 31, 2016
USD ($)
security
Sep. 30, 2014
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Securities pledged as collateral $ 231,516,000 $ 222,328,000  
Number of securities temporarily impaired (security) | security 241 299  
Number of securities temporarily impaired for 12 months or more (security) | security 157 15  
Period of temporary impairment 12 months 12 months  
Amortized cost of securities transferred     $ 89,780,000
Fair value of securities transferred     89,757,000
Net unrealized losses on securities transferred     $ 15,000
Net unrealized loss on securities transferred from available for sale to held to maturity $ 174,000 $ 129,000  
Number of states | state 6    
FHLB stock $ 9,321,000 10,893,000  
Impairment losses $ 0 $ 0