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Borrowings - Additional Information (Detail) - USD ($)
9 Months Ended
Jan. 06, 2022
Sep. 15, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]          
Securities sold under agreements to repurchase     $ 132,800,000   $ 106,500,000
Advances from the FHLB     25,000,000   25,000,000
Subordinated debt     14,734,000 $ 0  
Securities Sold under Agreements to Repurchase          
Debt Instrument [Line Items]          
Pledged assets separately reported, mortgage-related securities available-for-sale or held-for-investment     135,100,000    
Subordinated Debt | Fixed To Floating, Due September 15, 2031          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 150,000,000      
Debt instrument, interest rate, stated percentage   2.875%      
Subordinated Debt | Fixed To Floating, Due September 15, 2031 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate   2.20%      
Subordinated Debt | Fixed To Floating Due June 15, 2036          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 18,000,000        
Subordinated debt $ 14,700,000        
Debt instrument, basis spread on variable rate 1.65%        
Line of Credit          
Debt Instrument [Line Items]          
Federal funds available for borrowing     250,000,000    
Overnight federal funds borrowed     0   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     $ 225,000,000   $ 0
Collateralized FHLB Advances | Weighted Average          
Debt Instrument [Line Items]          
Federal Home Loan Bank, advances, branch of FHLB Bank, interest rate     0.77%