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Investments Securities - Additional Information (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Investments [Abstract]    
Investment securities with carrying value pledged to secure public deposits $ 19,678,000 $ 15,123,000
Sales of investment securities $ 0 $ 0
Number of securities in unrealized loss position | Security 12 11
Securities other than temporarily impaired $ 0 $ 0