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Investment Securities - Additional information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Investment Securities:      
Consolidated investment securities portfolio modified, years 24 months 21 days   36 months 27 days
Book value of securities available for sale and held to maturity $ 117,364,000   $ 117,076,000
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions 34    
Standard & Poor's, AAA Rating [Member]      
INVESTMENT SECURITIES      
Portfolio rated 52.10%   53.40%
Securities rated below A [Member]      
INVESTMENT SECURITIES      
Portfolio rated 9.80%   9.10%
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member]      
Investment Securities:      
Equity Securities, FV-NI $ 386,000   $ 366,000
Equity securities, realized gain 6,000 $ 0  
Equity securities, unrealized loss $ 6,000 $ 0  
Minimum      
Investment Securities:      
Consolidated investment securities portfolio modified, years 24 months    
Maximum      
Investment Securities:      
Consolidated investment securities portfolio modified, years 60 months