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Long-Term Debt and FHLB Stock (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Long-Term Debt And Federal Home Loan Bank [Line Items]        
Advances from Federal Home Loan Banks   $ 54,857   $ 66,304
Funding received   (2,223) $ (13,954)  
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
Paycheck Protection Program        
Long-Term Debt And Federal Home Loan Bank [Line Items]        
Interest rate   0.35%    
Percentage of Principal Funding   100.00%    
Funding received $ 70,100      
Subordinated Debt.        
Long-Term Debt And Federal Home Loan Bank [Line Items]        
Interest rate, variable rate basis   3-month LIBOR    
Interest LIBOR rate   2.00%    
Interest rate   2.26%   3.91%
Subordinated debt securities   $ 5,155    
Stated maturity date   May 23, 2035    
Subordinated Debt. | 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]        
Line of credit, maximum borrowing capacity   $ 556,202   $ 486,906
Amount of pledged assets   176,487   168,230
Advances from Federal Home Loan Banks   54,857    
Impairment Related To Federal Home Loan Stock   $ 0   $ 0