Loans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Loan	Dec. 31, 2020 USD ($) Loan
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 833,739,000	$ 826,733,000
Notes, Loans and Financing Receivable, Net [Abstract]
Ninety days past due and still accruing interest	$ 0	$ 0
Troubled Debt Restructuring During Prior Twelve Months [Member]
Notes, Loans and Financing Receivable, Net [Abstract]
Number of loans subsequently defaulted | Loan	0	0
Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan	2,109
Total loans	$ 247,276,000	$ 235,392,000
Residential mortgage loans pledged to FHLBNY as blanket collateral	$ 123,200,000	$ 115,600,000
Real Estate [Member]
Notes, Loans and Financing Receivable, Net [Abstract]
Percentage of total loan portfolio	68.00%	68.00%
Minimum [Member] | Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 0
Maximum [Member] | Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,522,000
PPP Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Deferred fee income	$ 2,150,000	$ 938,000
Number of loans outstanding | Loan	256
Total loans	$ 19,338,000
Unusual or Infrequent Item, or Both | Ninety Days Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		618
Total loans		$ 137,400,000
Unusual or Infrequent Item, or Both | Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan	0
Total loans		$ 17,100,000
Loan outstanding		2.10%
Unusual or Infrequent Item, or Both | Residential Mortgage or Consumer Loans [Member] | Ninety Days Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		303
Total loans		$ 24,000,000.0
Unusual or Infrequent Item, or Both | Residential Mortgage or Consumer Loans [Member] | Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		38
Total loans		$ 2,700,000
Unusual or Infrequent Item, or Both | Residential and Consumer Loans [Member] | Non-Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		265
Total loans		$ 21,300,000
Unusual or Infrequent Item, or Both | Commercial Real Estate or Other Commercial and Industrial Loans [Member] | Ninety Days Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		315
Total loans		$ 113,300,000
Unusual or Infrequent Item, or Both | Commercial Real Estate or Other Commercial and Industrial Loans [Member] | Non-Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		291
Total loans		$ 98,900,000
Unusual or Infrequent Item, or Both | Commercial Real Estate or Other Commercial and Industrial Loans [Member] | Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		24
Total loans		$ 14,400,000
Unusual or Infrequent Item, or Both | Commercial Loan | One Eighty Days and Beyond Deferral [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans outstanding | Loan		11
Total loans		$ 8,300,000
Unusual or Infrequent Item, or Both | Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans Payable Contractual Maturities Term	2 years
Unusual or Infrequent Item, or Both | Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans Payable Contractual Maturities Term	5 years
Unusual or Infrequent Item, or Both | PPP Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
InterestOnLoan	1.00%
Loan origination fees	$ 4,000,000.0	4,000,000.0
Deferred fee income	3,100,000
Deferred fee income remaining	912,000
Unusual or Infrequent Item, or Both | PPP Loan [Member] | Interest Income [Member]
Accounts Notes And Loans Receivable [Line Items]
Loan origination fees	$ 2,200,000	$ 900,000