Fair Value Measurement - Estimated Fair Values Of The Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and cash equivalents	$ 91,068	$ 87,544
Trading securities	13,461	12,291
Debt securities available-for-sale	1,208,237	1,264,805
Debt securities held-to-maturity	5,475	7,574
Equity securities	328	253
FHLBNY stock, at cost	22,336	28,641
Loans held-for-sale		19,895
Net loans held-for-investment	3,904,026	3,842,054
Derivative assets	923	1,498
Financial liabilities:
Deposits	4,172,125	4,082,538
Borrowed funds	426,235	609,900
Advance payments by borrowers for taxes and insurance	24,909	19,677
Derivative liabilities	925	1,502
Investment measured at fair value	5,000
Carrying Value
Financial assets:
Cash and cash equivalents	91,068	87,544
Trading securities	13,461	12,291
Debt securities available-for-sale	1,208,237	1,264,805
Debt securities held-to-maturity	5,283	7,234
Equity securities	328	253
FHLBNY stock, at cost	22,336	28,641
Loans held-for-sale		19,895
Net loans held-for-investment	3,767,644	3,785,631
Derivative assets	923	1,498
Financial liabilities:
Deposits	4,169,334	4,076,551
Borrowed funds		591,789
Advance payments by borrowers for taxes and insurance	24,909	19,677
Derivative liabilities	925	1,502
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	91,068	87,544
Trading securities	13,461	12,291
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities	328	253
FHLBNY stock, at cost	0	0
Loans held-for-sale		0
Net loans held-for-investment	0	0
Derivative assets	0	0
Financial liabilities:
Deposits	0	0
Borrowed funds	0	0
Advance payments by borrowers for taxes and insurance	0	0
Derivative liabilities	0	0
Estimated Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Trading securities	0	0
Debt securities available-for-sale	1,208,237	1,264,805
Debt securities held-to-maturity	5,475	7,574
Equity securities	0	0
FHLBNY stock, at cost	22,336	28,641
Loans held-for-sale		0
Net loans held-for-investment	0	0
Derivative assets	923	1,498
Financial liabilities:
Deposits	4,172,125	4,082,538
Borrowed funds	426,235	609,900
Advance payments by borrowers for taxes and insurance	24,909	19,677
Derivative liabilities	925	1,502
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Trading securities	0	0
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities	0	0
FHLBNY stock, at cost	0	0
Loans held-for-sale		19,895
Net loans held-for-investment	3,904,026	3,842,054
Derivative assets	0	0
Financial liabilities:
Deposits	0	0
Borrowed funds	0	0
Advance payments by borrowers for taxes and insurance	0	0
Derivative liabilities	$ 0	$ 0