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Fair Value Measurements - Estimated Fair Values of the Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets:
Trading securities	$ 12,743	$ 12,291
Debt securities available-for-sale	1,097,423	1,264,805
Debt securities held-to-maturity	6,703	7,574
Loans held-for-sale		19,895
Carrying Value
Financial assets:
Cash and cash equivalents	193,184	87,544
Trading securities	12,743	12,291
Debt securities available-for-sale	1,097,423	1,264,805
Debt securities held-to-maturity	6,417	7,234
Equity securities	219	253
FHLBNY stock, at cost	24,508	28,641
Loans held-for-sale		19,895
Net loans held-for-investment	3,777,780	3,785,631
Derivative assets	788	1,498
Financial liabilities:
Deposits	4,108,269	4,076,551
Borrowed funds	470,329	591,789
Advance payments by borrowers for taxes and insurance	24,203	19,677
Derivative liabilities	790	1,502
Estimated Fair Value
Financial assets:
Cash and cash equivalents	193,184	87,544
Trading securities	12,743	12,291
Debt securities available-for-sale	1,097,423	1,264,805
Debt securities held-to-maturity	6,703	7,574
Equity securities	219	253
FHLBNY stock, at cost	24,508	28,641
Net loans held-for-investment	3,894,985	3,842,054
Derivative assets	788	1,498
Financial liabilities:
Deposits	4,112,519	4,082,538
Borrowed funds	481,011	609,900
Advance payments by borrowers for taxes and insurance	24,203	19,677
Derivative liabilities	790	1,502
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	193,184	87,544
Trading securities	12,743	12,291
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities	219	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 | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Trading securities	0	0
Debt securities available-for-sale	1,097,423	1,264,805
Debt securities held-to-maturity	6,703	7,574
Equity securities	0	0
FHLBNY stock, at cost	24,508	28,641
Loans held-for-sale		0
Net loans held-for-investment	0	0
Derivative assets	788	1,498
Financial liabilities:
Deposits	4,112,519	4,082,538
Borrowed funds	481,011	609,900
Advance payments by borrowers for taxes and insurance	24,203	19,677
Derivative liabilities	790	1,502
Estimated Fair Value | Significant Unobservable Inputs (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	3,894,985	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

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