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Long-Term Debt and FHLB Stock (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Advances from Federal Home Loan Banks   $ 50,674 $ 66,304
Funding received   (4,302) 13,209
Zions Bank      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Line of credit, maximum borrowing capacity   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   2.21% 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]      
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available   $ 564,330 $ 486,906
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   175,011 168,230
Advances from Federal Home Loan Banks   50,674  
Impairment Related To Federal Home Loan Stock   0 0
Federal Home Loan Bank of New York ("FHLBNY") | Maturity Overnight [Member]      
Long-Term Debt And Federal Home Loan Bank [Line Items]      
Advances from Federal Home Loan Banks   $ 0 $ 22,500