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Summary of Significant Accounting Policies (Details) shares in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) item shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Other real estate owned |  | $ 0 | $ 0 | $ 239,000 | $ 0
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | 81,700,000 | 157,400,000 |  |
Restricted Cash and Cash Equivalents |  | $ 21,500,000 | $ 63,500,000 |  |
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List] |  | Cash and Cash Equivalents, at Carrying Value, Ending Balance | Cash and Cash Equivalents, at Carrying Value, Ending Balance |  |
Interest-bearing Deposits in Banks and Other Financial Institutions |  | $ 51,700,000 | $ 133,700,000 |  |
Interest Income, Securities, Operating, Tax Exempt |  | 1,700,000 | 1,900,000 | 2,000,000.0 |
Goodwill, Impairment Loss |  | 0 | 0 | 0 |
Goodwill, Ending Balance |  | 17,636,000 | 17,636,000 |  |
Financing Receivable Purchase |  | 262,100,000 | 193,300,000 | 221,200,000 |
Financing Receivable Sale |  | 27,400,000 | 7,400,000 | 13,700,000 |
(Benefit) provision for loans |  | 4,900,000 | 22,600,000 | 2,800,000 |
Assets Acquired | $ 286,100,000 |  |  |  |
Allowance for credit losses | $ 4,100,000 |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance |  | 0 | 0 |  |
Other than Temporary Impairment Losses, Investments, Total |  | 0 |  |  |
Advertising Expense |  | $ 2,500,000 | 1,800,000 | 2,200,000 |
Number of business units | item |  | 3 |  |  |
Purchase of bank owned life insurance |  | $ 25,000,000 | $ 0 | $ 25,000,000 |
Flushing Financial Capital Trust II [Member] |  |  |  |  |
Capital Securities, Value Issued |  | 60,000,000.0 |  |  |
Common Securities With Voting Rights, Value , Issued |  | $ 1,900,000 |  |  |
Percentage Of Ownership Interest In Common Securities Of Trust |  | 100.00% |  |  |
Share-based Payment Arrangement, Option |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 0 | 0 | 0 |
Bank Premises and Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Bank Premises and Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount |  | $ 8,700,000 | $ 5,900,000 |  |
Loans Receivable [Member] |  |  |  |  |
Number of active forbearances | item |  | 20 |  |  |
Outstanding balance in active forbearance |  | $ 71,900,000 |  |  |
Financing Receivable |  | 4,800,000 |  |  |
Interest Receivable |  | $ 35,800,000 | $ 41,500,000 |  |

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