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Troubled Debt Restructurings (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan contract | Sep. 30, 2020 contract | Sep. 30, 2021 USD ($) loan contract | Sep. 30, 2020 contract | Dec. 31, 2020 USD ($) loan
Financing Receivable Modifications [Line Items] |  |  |  |  |
Number of troubled debt restructured loans | loan |  |  | 17 |  | 17
Financing Receivable, Modifications, Nonaccrual, Number of Contracts | loan | 3 |  | 3 |  | 3
Financing Receivable, Modifications, Nonaccrual, Recorded Investment | $ | $ 791 |  | $ 791 |  | $ 796
Total troubled debt restructured loans | $ | $ 2,700 |  | $ 2,700 |  | $ 3,300
Number of deferral loans of interest and principal payments | loan | 2 |  | 2 |  | 255
Number of contractions modified by granting concession |  | 1 | 3 |  |
Number of contracts modified by changing the amortization period |  | 1 |  | 1 |
Number of contracts modified by reduced payment amount |  | 1 |  | 1 |
Number of payment defaults | 0 | 0 | 0 | 0 |
Residential Single Family |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Loan is considered payment default |  |  | 30 days |  |
Payment Deferral [Member] | CARES Act [Member] |  |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |  |
Deferrals on outstanding loan balances | $ | $ 41 |  | $ 41 |  | $ 130,500

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