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Long-Term Debt and FHLB Stock (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Advances from Federal Home Loan Banks $ 79,645 $ 66,304  
Atlantic Community Bankers Bank      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Line of credit facility, maximum amount outstanding during period     $ 5,000
Zions Bank      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Line of credit, maximum borrowing capacity 10,000 10,000  
Line of credit facility, maximum amount outstanding during period $ 0 $ 0  
Subordinated Debt [Member]      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Interest rate 3.45% 3.91%  
Interest rate, variable rate basis 3-month LIBOR    
Interest LIBOR rate 2.00%    
Subordinated debt securities $ 5,155    
Stated maturity date May 23, 2035    
Subordinated Debt [Member] | RSB Capital Trust I      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Interest rate, variable rate basis 3-month LIBOR    
Interest LIBOR rate 2.00%    
Trust term 30 years    
Federal Home Loan Bank of New York ("FHLBNY")      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Advances from Federal Home Loan Banks $ 79,645    
Line of credit, maximum borrowing capacity 503,527 $ 486,906  
Amount of pledged assets 186,202 168,230  
Impairment Related To Federal Home Loan Stock $ 0 $ 0