XML 70 R60.htm IDEA: XBRL DOCUMENT v3.21.1
Borrowings - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Securities sold under agreements to repurchase   $ 62,000,000.0 $ 69,600,000
Advances from the FHLB   25,000,000.0 25,000,000.0
Repayments of debt $ 10,000,000.0    
Securities Sold under Agreements to Repurchase      
Debt Instrument [Line Items]      
Pledged securities   72,700,000  
Line of Credit      
Debt Instrument [Line Items]      
Overnight federal funds borrowed   0 0
Federal funds available for borrowing   215,000,000.0  
Line of Credit | Federal Reserve Bank of New York      
Debt Instrument [Line Items]      
Federal reserve bank, advances, amount of advances by branch   0 0
Federal Home Loan Bank of New York | Line of Credit      
Debt Instrument [Line Items]      
Overnight borrowings   $ 50,000,000.0 $ 100,000,000.0
Collateralized FHLB Advances      
Debt Instrument [Line Items]      
Long term debt prepayment fee $ 356,000    
Collateralized FHLB Advances | Weighted Average      
Debt Instrument [Line Items]      
Federal Home Loan Bank, advances, branch of FHLB Bank, interest rate   0.77%