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BORROWINGS (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Residential and commercial mortgage loans pledged $ 320,800,000  
Long-term fixed rate advances $ 34,100,000 $ 40,100,000
Federal funds rate | Minimum    
Debt Instrument [Line Items]    
Variable rate spread on debt instrument (in percentage) 20.00%  
Federal funds rate | Maximum    
Debt Instrument [Line Items]    
Variable rate spread on debt instrument (in percentage) 30.00%  
ACBB    
Debt Instrument [Line Items]    
Secured borrowing potential $ 10,000,000  
Ability to borrow capacity 10,000,000  
FHLBNY    
Debt Instrument [Line Items]    
Secured borrowing potential 320,800,000  
Ability to borrow capacity 110,100,000  
Term advances $ 196,100,000 $ 193,000,000
Weighted average interest rate (in percentage) 0.91% 1.81%