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Borrowed Funds - Terms of the Securities Issued by the Trusts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Flushing Financial Capital Trust II [Member] | Capital Securities [Member] |  |
Issue Date | Jun. 20, 2007 |
Initial Rate | 7.14% |
First Reset Date | Sep. 01, 2012 |
Spread over 3-month SOFR\LIBOR | 1.41% |
Maturity Date | Sep. 01, 2037 |
Flushing Financial Capital Trust III [Member] | Capital Securities [Member] |  |
Issue Date | Jun. 21, 2007 |
Initial Rate | 6.89% |
First Reset Date | Jun. 15, 2012 |
Spread over 3-month SOFR\LIBOR | 1.44% |
Maturity Date | Sep. 15, 2037 |
Flushing Financial Capital Trust IV [Member] | Capital Securities [Member] |  |
Issue Date | Jul. 03, 2007 |
Initial Rate | 6.85% |
First Reset Date | Jul. 30, 2012 |
Spread over 3-month SOFR\LIBOR | 1.42% |
Maturity Date | Jul. 30, 2037 |
Subordinated Debentures. |  |
Amount | $ 65,000 | $ 125,000
$1,25,000 subordinate debentures due December 01, 2031 |  |
Amount |  | $ 125,000
Issue Date |  | Nov. 22, 2021
Initial Rate |  | 3.125%
First Reset Date |  | Dec. 01, 2026
First Call Date |  | Dec. 01, 2026
Maturity Date |  | Dec. 01, 2031
$1,25,000 subordinate debentures due December 01, 2031 | London Interbank Offered Rate (LIBOR) [Member] |  |
Spread over 3-month SOFR\LIBOR |  | 2.035%
$65,000 Subordinated debentures due September 1, 2032 |  |
Amount | $ 65,000 |
Issue Date | Aug. 24, 2022 |
Initial Rate | 6.00% |
First Reset Date | Sep. 01, 2027 |
First Call Date | Sep. 01, 2027 |
Maturity Date | Sep. 01, 2032 |
$65,000 Subordinated debentures due September 1, 2032 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |
Spread over 3-month SOFR\LIBOR | 3.13% |

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