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Commitments and Contingencies (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019
Loans and Leases Receivable, Commitments, Fixed Rates |  |  | $ 38.4 |
Loans and Leases Receivable, Commitments, Weighted Average Rate of Interest |  |  | 3.82% |
Loans and Leases Receivable, Commitments, Variable Rates |  |  | $ 436.7 |
Loans and Leases Receivable, Commitments, Variable Rates, Weighted Average Rate |  |  | 3.84% |
Loan Commitments, Expiration |  |  | 90 days |
Line of Credit, Maturity, Max |  |  | 1 year 180 days |
Purchase obligations |  |  | $ 17.4 | $ 22.0
Home Equity Line of Credit [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  |  | $ 411.7 |
Line of Credit, Maturity, Max |  |  | 10 years |
Letter of Credit Pledged as Collateral [Member] |  |  |  |
Deposit Liabilities, Collateral Issued, Financial Instruments |  |  | $ 855.4 | $ 494.0
Capital Securities [Member] | Flushing Financial's Capital Trusts [Member] |  |  |  |
Proceeds from Issuance of Debt | $ 61.9 | $ 61.9 |  |
Mortgages [Member] |  |  |  |
Loans and Leases Receivable, Commitments, Credit |  |  | $ 62.4 |

X
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