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Borrowed Funds (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) item $ / item
Advances from Federal Home Loan Banks and Letters of Credit		$ 1,889,200,000
Subordinated Borrowing, Interest Rate	6.00%
Subordinated debentures	$ 186,965,000	122,885,000
Repayments of subordinated debt		$ 90,300,000
Number of repayments for subordinated debt in call feature		3
Subordinated debt called at par | item		2
Subordinated debt, premium | $ / item		102.5
Flushing Bank
Proceeds from subordinated debt	50,000,000.0
Capital Securities [Member] | Flushing Financial Capital Trust IV [Member]
Proceeds from Issuance of Debt	20,600,000
Capital Securities [Member] | Flushing Financial Capital Trust II [Member]
Proceeds from Issuance of Debt	20,600,000
Capital Securities [Member] | Flushing Financial Capital Trust III [Member]
Proceeds from Issuance of Debt	20,600,000
Unsecured Line of Credit [Member]
Unsecured lines of credit	1,108,000,000.0
Federal Home Loan Bank of New York [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	3,800,100,000
Federal Home Loan Bank advances and other borrowings	$ 815,501,000	$ 611,187,000
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Minimum [Member]
Debt Instrument, Term	7 days
Federal Home Loan Bank Advances [Member] | Federal Home Loan Bank of New York [Member] | Maximum [Member]
Debt Instrument, Term	3 years
Other Borrowings [Member] | Other Borrowings Due in 2022
Unsecured debt	$ 0	25,000,000
Subordinated Debentures.
Net Proceeds	63,600,000
Debt Instrument, Face Amount	65,000,000.0	$ 125,000,000.0
Subordinated Borrowing, Interest Rate		3.125%
Proceeds from Issuance of Debt		$ 122,800,000
Subordinated debentures	186,965,000	122,885,000
Unamortized debt issuance costs	3,000,000.0
Subordinated Debentures. | Subordinated debentures Due in 2031
Subordinated debentures	$ 123,285,000	122,885,000
Subordinated Debt One [Member]
Repayments of subordinated debt		75,000,000.0
Subordinated Debt Two [Member]
Repayments of subordinated debt		7,800,000
Subordinated Debt Three [Member]
Repayments of subordinated debt		7,500,000
Premium paid upon call		$ 200,000

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