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Commitments and Contingencies (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable, Commitments, Fixed Rates			$ 17,800
Loans and Leases Receivable, Commitments, Weighted Average Rate of Interest			4.32%
Loans and Leases Receivable, Commitments, Variable Rates			$ 289,300
Loans and Leases Receivable, Commitments, Variable Rates, Weighted Average Rate			4.75%
Loan Commitments, Expiration			90 days
Line of Credit, Maturity, Max			1 year 180 days
Operating Leases, Future Minimum Payments Due, Total				$ 60,234
Home Equity Line of Credit [Member]
Loans and Leases Receivable, Commitments, Credit			$ 262,300
Line of Credit, Maturity, Max			10 years
Letter of Credit Pledged as Collateral [Member]
Deposit Liabilities, Collateral Issued, Financial Instruments			$ 494,000	$ 659,600
Capital Securities [Member] | Flushing Financial's Capital Trusts [Member]
Proceeds from Issuance of Debt	$ 61,900	$ 61,900
Mortgages [Member]
Loans and Leases Receivable, Commitments, Credit			$ 44,800

X

- Definition

Maximum length of time until the line of credit matures.

+ References

No definition available.

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- Definition

Loan commitments expiration period.

+ References

No definition available.

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- Definition

Reflects the amount of cash required to fully fund agreements to provide credit to borrowers.

+ References

No definition available.

+ Details

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X

- Definition

Reflects the weighted average interest rate on commitments to advance to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

No definition available.

+ Details

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- Definition

Reflects the weighted average interest rate associated with agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

No definition available.

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- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

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- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

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- Definition

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

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-Publisher FASB
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