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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Line Of Credit Facility [Line Items]          
Advance from the Federal Home Loan Bank $ 371,100,000   $ 371,100,000   $ 511,400,000
Guarantee from the FHLBNY through a standby letter of credit 1,000,000   1,000,000   21,500,000
Interest expense on FHLBNY advances 7,000,000 $ 1,500,000 17,600,000 $ 2,500,000  
Interest Expense on overnight advances 0 $ 300,000 900,000 $ 300,000  
Collateral in residential 1-4 and multifamily mortgage loans available to secure advances from the FHLBNY 1,814,329,000   1,814,329,000   1,525,668,000
Asset Pledged as Collateral without Right          
Line Of Credit Facility [Line Items]          
Collateral in residential 1-4 and multifamily mortgage loans available to secure advances from the FHLBNY 853,600,000   853,600,000   478,800,000
Overnight Line of Credit Advance          
Line Of Credit Facility [Line Items]          
Advance from the Federal Home Loan Bank $ 0   $ 0   6,000,000
FRBNY          
Line Of Credit Facility [Line Items]          
Percentage of total securities portfolio 49.40%   49.40%    
Securities portfolio amortized cost     $ 303,800,000    
Outstanding term advances from FRBNY $ 304,000,000   $ 304,000,000   $ 0