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Summary of Significant Accounting Policies (Details) shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) item | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) item shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | $ 157,400 |  |  |  | $ 49,800 |  |  |  | $ 157,400 | $ 49,800 |
Restricted Cash and Cash Equivalents |  | $ 63,500 |  |  |  |  |  |  |  | $ 63,500 |  |
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 |  | $ 133,700 |  |  |  | 36,500 |  |  |  | $ 133,700 | 36,500 |
Cash Reserve Deposit Required and Made |  |  |  |  |  | 14,400 |  |  |  |  | 14,400 |
Interest Income, Securities, Operating, Tax Exempt |  |  |  |  |  |  |  |  |  | 1,900 | 2,000 | $ 3,400
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Goodwill, Ending Balance |  | 17,636 |  |  |  | 16,127 |  |  |  | 17,636 | 16,127 |
Financing Receivable Purchase |  |  |  |  |  |  |  |  |  | 193,300 | 221,200 | 294,600
Financing Receivable Sale |  |  |  |  |  |  |  |  |  | 7,400 | 13,700 | 14,000
Provision for credit loan losses |  | 3,862 | $ 2,470 | $ 9,619 | $ 7,178 | (318) | $ 683 | $ 1,474 | $ 972 | 22,600 | 2,811 | 575
Assets Acquired | $ 286,100 |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Losses | $ 4,100 |  |  |  |  |  |  |  |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other than Temporary Impairment Losses, Investments, Total |  |  |  |  |  |  |  |  |  | 0 |  |
Advertising Expense |  |  |  |  |  |  |  |  |  | $ 1,800 | $ 2,200 | $ 2,200
Number of business units | item |  |  |  |  |  |  |  |  |  | 3 |  |
Flushing Financial Capital Trust II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Securities, Value Issued |  |  |  |  |  |  |  |  |  | $ 60,000 |  |
Common Securities With Voting Rights, Value , Issued |  |  |  |  |  |  |  |  |  | $ 1,900 |  |
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 |  | $ 5,900 |  |  |  | 6,600 |  |  |  | $ 5,900 | $ 6,600 |
Loans Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of active forbearances | item |  | 134 |  |  |  |  |  |  |  | 134 |  |
Outstanding balance in active forbearance |  | $ 364,400 |  |  |  |  |  |  |  | $ 364,400 |  |
Financing Receivable |  | 23,600 |  |  |  |  |  |  |  | 23,600 |  |
Interest Receivable |  | $ 41,500 |  |  |  | $ 19,700 |  |  |  | $ 41,500 | $ 19,700 |

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