Fair Value - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	$ 140,044	$ 113,346
Held-to-maturity securities, at amortized cost	211,517	934
Mortgage loans held for sale, at fair value	9,200
Warehouse lines of credit (Note 8)		15,090
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	274,806	153,894
Available-for-sale securities, at fair value (Note 4)	140,044	113,346
Held-to-maturity securities, at amortized cost	211,517	934
Placements with banks	2,490	2,490
Mortgage loans held for sale, at fair value	9,234	15,836
Loans receivable, net	1,324,320	1,305,078
Accrued interest receivable	13,255	12,362
FHLBNY stock	16,429	6,001
Demand deposits	284,462	274,956
Interest-bearing deposits	500,261	500,281
Certificates of deposit	364,005	429,479
Advance payments by borrowers for taxes and insurance	8,668	7,657
Advances from FHLBNY	334,375	106,255
Accrued interest payable	158	228
Warehouse lines of credit (Note 8)		15,090
Fair Value Measurements
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	274,806	153,894
Available-for-sale securities, at fair value (Note 4)	140,044	113,346
Held-to-maturity securities, at amortized cost	211,352	914
Placements with banks	2,490	2,490
Mortgage loans held for sale, at fair value	9,234	15,836
Loans receivable, net	1,298,496	1,306,253
Accrued interest receivable	13,255	12,362
FHLBNY stock	16,429	6,001
Demand deposits	284,462	274,956
Interest-bearing deposits	500,261	500,281
Certificates of deposit	358,040	431,339
Advance payments by borrowers for taxes and insurance	8,668	7,657
Advances from FHLBNY	331,700	106,680
Accrued interest payable	158	228
Warehouse lines of credit (Note 8)		15,090
Fair Value Measurements \| Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	274,806	153,894
FHLBNY stock	16,429	6,001
Demand deposits	284,462	274,956
Interest-bearing deposits	500,261	500,281
Fair Value Measurements \| Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	135,399	108,417
Held-to-maturity securities, at amortized cost	211,352	914
Placements with banks	2,490	2,490
Mortgage loans held for sale, at fair value	9,234	15,836
Accrued interest receivable	13,255	12,362
Certificates of deposit	358,040	431,339
Advance payments by borrowers for taxes and insurance	8,668	7,657
Advances from FHLBNY	331,700	106,680
Accrued interest payable	158	228
Warehouse lines of credit (Note 8)		15,090
Fair Value Measurements \| Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available-for-sale securities, at fair value (Note 4)	4,645	4,929
Loans receivable, net	$ 1,298,496	$ 1,306,253

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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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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