Fair Value - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	$ 113,346	$ 17,498
Held-to-maturity securities, at amortized cost	934	1,743
Mortgage loans held for sale, at fair value	15,800
Warehouse lines of credit (Note 8)	15,090	29,961
Mortgage loan fundings payable (Note 8)		1,483
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	153,894	72,078
Available-for-sale securities, at fair value (Note 4)	113,346	17,498
Held-to-maturity securities, at amortized cost	934	1,743
Placements with banks	2,490	2,739
Mortgage loans held for sale, at fair value	15,836	35,406
Loans receivable, net	1,305,078	1,158,640
Accrued interest receivable	12,362	11,396
FHLBNY stock	6,001	6,426
Demand deposits	274,956	189,855
Interest-bearing deposits	500,281	432,737
Certificates of deposit	429,479	406,987
Advance payments by borrowers for taxes and insurance	7,657	7,019
Advances from FHLBNY	106,255	117,255
Warehouse lines of credit (Note 8)	15,090	29,961
Mortgage loan fundings payable (Note 8)		1,483
Accrued interest payable	228	60
Fair Value Measurements
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	153,894	72,078
Available-for-sale securities, at fair value (Note 4)	113,346	17,498
Held-to-maturity securities, at amortized cost	914	1,722
Placements with banks	2,490	2,739
Mortgage loans held for sale, at fair value	15,836	35,406
Loans receivable, net	1,306,253	1,182,971
Accrued interest receivable	12,362	11,396
FHLBNY stock	6,001	6,426
Demand deposits	274,956	189,855
Interest-bearing deposits	500,281	432,737
Certificates of deposit	431,339	411,742
Advance payments by borrowers for taxes and insurance	7,657	7,019
Advances from FHLBNY	106,680	119,248
Warehouse lines of credit (Note 8)	15,090	29,961
Mortgage loan fundings payable (Note 8)		1,483
Accrued interest payable	228	60
Fair Value Measurements \| Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	153,894	72,078
FHLBNY stock	6,001	6,426
Demand deposits	274,956	189,855
Interest-bearing deposits	500,281	432,737
Fair Value Measurements \| Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	108,417	17,498
Held-to-maturity securities, at amortized cost	914	1,722
Placements with banks	2,490	2,739
Mortgage loans held for sale, at fair value	15,836	35,406
Accrued interest receivable	12,362	11,396
Certificates of deposit	431,339	411,742
Advance payments by borrowers for taxes and insurance	7,657	7,019
Advances from FHLBNY	106,680	119,248
Warehouse lines of credit (Note 8)	15,090	29,961
Mortgage loan fundings payable (Note 8)		1,483
Accrued interest payable	228	60
Fair Value Measurements \| Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	4,929
Loans receivable, net	$ 1,306,253	$ 1,182,971

Accrued interest payable fair value.

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Accrued interest receivable fair value.

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Advance payments by borrowers for taxes and insurance fair value.

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Certificates of deposit fair value.

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Demand deposit liability fair value.

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Interest bearing deposit fair value.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of mortgage loans held-for-sale.

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The aggregate amount of the participation liability at the end of the accounting period.

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Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

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