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v3.24.0.1

Summary of Significant Accounting Policies (Details) shares in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) security | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) security | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) security item shares | Dec. 31, 2022 USD ($) security shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($)
Other real estate owned | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |
Restricted Cash and Cash Equivalents | 47,900,000 |  |  |  | 66,300,000 |  |  |  | 47,900,000 | 66,300,000 |  |
ACL for held-to-maturity securities | $ 1,087,000 |  |  |  | $ 1,100,000 |  |  |  | $ 1,087,000 | $ 1,100,000 | $ 862,000 | $ 907,000
Number of securities in portfolio | security | 4 |  |  |  | 4 |  |  |  | 4 | 4 |  |
Interest-bearing Deposits in Banks and Other Financial Institutions | $ 145,300,000 |  |  |  | $ 121,900,000 |  |  |  | $ 145,300,000 | $ 121,900,000 |  |
Interest Income, Securities, Operating, Tax Exempt |  |  |  |  |  |  |  |  | 1,500,000 | 1,700,000 |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Goodwill, Ending Balance | 17,636,000 |  |  |  | 17,636,000 |  |  |  | 17,636,000 | 17,636,000 |  |
Financing Receivable Purchase |  |  |  |  |  |  |  |  | 166,300,000 | 275,700,000 | 262,100,000 |
(Benefit) provision for loans | 998,000 | $ 596,000 | $ 1,416,000 | $ 7,508,000 | (12,000) | $ 2,145,000 | $ 1,590,000 | $ 1,358,000 |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 |  |
Other than temporary impairment losses investments |  |  |  |  |  |  |  |  | 0 | 0 |  |
Advertising Expense |  |  |  |  |  |  |  |  | $ 2,100,000 | 3,100,000 | 2,500,000 |
Maximum remaining term | 40 months |  |  |  |  |  |  |  | 40 months |  |  |
Number of business units | item |  |  |  |  |  |  |  |  | 3 |  |  |
Purchase of bank owned life insurance |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 25,000,000 |
Securities similar to commercial owner occupied loan |  |  |  |  |  |  |  |  |  |  |  |
Number of securities in portfolio | security | 2 |  |  |  | 2 |  |  |  | 2 | 2 |  |
Flushing Financial Capital Trust II |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Bank Premises and Equipment [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |  |  |  |  | 3 years |  |  |
Bank Premises and Equipment [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |  |  |  |  | 10 years |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans in process of foreclosure, amount | $ 4,800,000 |  |  |  | $ 5,200,000 |  |  |  | $ 4,800,000 | $ 5,200,000 |  |
Loans Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Interest Receivable | $ 45,000,000.0 |  |  |  | $ 34,500,000 |  |  |  | $ 45,000,000.0 | $ 34,500,000 |  |

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