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Troubled Debt Restructurings - Loans By Class of Financing Receivable Modified as TDRs (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 contract | Sep. 30, 2019 USD ($) contract | Dec. 31, 2019 contract
Troubled Debt Restructuring Subsequent Periods [Line Items] |  |  |
Number of troubled debt restructured loans | 16 |  | 18
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  | 1 |
Troubled Debt Restructurings Within Previous Twelve Months [Member] |  |  |
Troubled Debt Restructuring Subsequent Periods [Line Items] |  |  |
Troubled Debt Restructuring Modifications Recorded Investment | $ |  | $ 74 |
Troubled Debt Restructurings Within Previous Twelve Months [Member] | Residential Single Family |  |  |
Troubled Debt Restructuring Subsequent Periods [Line Items] |  |  |
Number of troubled debt restructured loans |  | 1 |
Troubled Debt Restructuring Modifications Recorded Investment | $ |  | $ 74 |

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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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