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Long-Term Debt and FHLB Stock (Detail Textuals) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 15, 2019
Jan. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Dividend paid to Rhinebeck Bancorp, MHC $ 5,100      
Atlantic Community Bankers Bank        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Interest rate, description   Wall Street Journal prime rate of interest, floating, plus 0.50%    
Interest LIBOR rate   0.50%    
Long-term Line of Credit   $ 5,000    
Zions Bank        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Unsecured, uncommitted line of credit   $ 10,000    
Subordinated Debt        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Interest rate     4.651% 4.653%
Interest rate, description     3-month LIBOR plus 2.00  
Interest LIBOR rate     2.00%  
Subordinated debt securities     $ 5,155  
Stated maturity date     May 23, 2035  
Subordinated Debt | RSB Capital Trust I        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Interest rate, description     3-month LIBOR plus 2.00  
Interest LIBOR rate     2.00%  
Trust term     30 years  
FHLB        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Preapproved secured line of credit     $ 442,413 $ 441,134
Amount of pledged assets     149,112 145,805
Outstanding amount secured line of credit     $ 59,800 $ 0
Interest rate     2.66%  
Structured borrowings     $ 17,045