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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-accrual loans, interest income lost |  |  | $ 998,000 | $ 1,200,000
Loans Receivable >90 Days and Accruing | $ 651,000 |  | 651,000 | 333,000
Loans acquired with deteriorated credit quality, fair value | 667,000 |  | 667,000 | 1,100,000
Troubled debt restructurings, subsequent default, amount | $ 232,072 | $ 602,274 |  |
Troubled debt restructuring, subsequent default, number | loan | 1 |  |  |
Troubled debt restructurings, number | loan | 1 | 5 |  |
Troubled debt restructurings, amount | $ 168,102 | $ 458,181 |  |
Past due loans | 17,015,000 |  | 17,015,000 | 30,879,000
Less Than 90 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due loans | $ 9,500,000 |  | $ 9,500,000 | $ 11,900,000

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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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