Borrowings - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Advance from the Federal Home Loan Bank	$ 106,300,000	$ 109,300,000
Unsecured fed fund line amount outstanding	25,000,000.0	25,000,000.0
Unsecured fed fund line amount outstanding	14,910,000	4,939,000
Repayments of advances from FHLBNY	22,500,000	179,879,000	$ 664,498,000
Interest expense on FHLBNY advances	2,200,000	2,500,000	1,700,000
Interest Expense on overnight advances		173,000,000	130,000,000
Collateral mortgage loans available to secure advances from the FHLB	$ 362,300	336,800
Warehouse line of credit expiration date	Jun. 30, 2022
Mortgage loans funding payable	$ 0	1,500
Warehouse Line of Credit #1
Line Of Credit Facility [Line Items]
Unsecured fed fund line amount outstanding	$ 8,636,000	$ 2,171,000
Debt Instrument, Interest Rate, Basis for Effective Rate	The interest rate is based on the 30-day LIBOR rate plus 3.25%.
Line of credit facility, effective interest rate	3.35%	3.39%
Warehouse Line of Credit #2
Line Of Credit Facility [Line Items]
Unsecured fed fund line amount outstanding	$ 6,274,000	$ 2,768,000
Debt Instrument, Interest Rate, Basis for Effective Rate	The interest rate is based on the 30-day LIBOR rate plus 3.00%
Line of credit facility, effective interest rate	3.10%	3.14%
Variable Rate Above LIBOR | Warehouse Line of Credit #1
Line Of Credit Facility [Line Items]
Interest rate, LIBOR/Variable rate	3.25%
Variable Rate Above LIBOR | Warehouse Line of Credit #2
Line Of Credit Facility [Line Items]
Interest rate, LIBOR/Variable rate	3.00%
Maximum
Line Of Credit Facility [Line Items]
Guarantee from the FHLBNY through a standby letter of credit	$ 21,500,000	$ 61,500,000
FHLBNY
Line Of Credit Facility [Line Items]
Unsecured fed fund line amount outstanding		$ 0	$ 0
Repayments of advances from FHLBNY	$ 11,000,000.0