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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]            
Federal funds purchased $ 15,000       $ 15,000  
Securities sold under agreements to repurchase 32,400       32,400  
Repayment of borrowings   $ 20,000   $ 20,000    
Long-term debt prepayment fees 0   $ 0   0 $ 2,828
Securities Sold under Agreements to Repurchase            
Debt Instrument [Line Items]            
Pledged securities $ 32,800       $ 32,800  
Federal Home Loan Bank of New York            
Debt Instrument [Line Items]            
Long-term debt prepayment fees       638    
Repayment of borrowings from the Federal Home Loan Bank       34,000    
Debt Securities Sold Under Agreement To Repurchase            
Debt Instrument [Line Items]            
Long-term debt prepayment fees       $ 2,200