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Loans - Troubled Debt Restructurings That Are Performing (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) contract
Number of contracts | 1 | 2 | 1 |
Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 19 |  | 25
Amortized Cost |  | $ 13,137,000 |  | $ 15,911,000
Multi-Family Residential [Member] | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 6 |  | 6
Amortized Cost |  | $ 1,681,000 |  | $ 1,700,000
Commercial Real Estate | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 1 |  | 1
Amortized Cost |  | $ 7,572,000 |  | $ 7,702,000
One-To-Four Family - Mixed Used Property [Member] |  |  |  |
Number of contracts | 1 |  | 1 |
One-To-Four Family - Mixed Used Property [Member] | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 5 |  | 5
Amortized Cost |  | $ 1,655,000 |  | $ 1,731,000
One-To-Four Family - Residential [Member] | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 3 |  | 3
Amortized Cost |  | $ 489,000 |  | $ 507,000
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  |  |  | 2
Amortized Cost |  |  |  | $ 440,000
Commercial Business and Other [Member] |  |  |  |
Number of contracts |  | 2 |  |
Commercial Business and Other [Member] | Performing Financial Instruments [Member] |  |  |  |
Number of contracts | contract |  | 4 |  | 8
Amortized Cost |  | $ 1,740,000 |  | $ 3,831,000

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- Definition The amount of amortized cost of financing receivables modified as troubled debt restructuring. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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