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Guarantees, Commitments, and Contingencies (Narrative) (Details) | 6 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended
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Jun. 30, 2021 USD ($) Apartment | Sep. 30, 2021 USD ($) Apartment | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($)
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Number of apartments under the project | Apartment |  | 37 |  |
Limited partner capital contribution |  | $ 7,506,000 |  | $ 7,506,000
Project investment amortization period |  | 10 years |  |
PPP Loans [Member] | Small Business Administration [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Nonrefundable loan processing fees received |  | $ 17,997,000 | $ 20,883,000 | $ 38,880,000
Cumberland County, Pennsylvania |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Number of apartments under the project | Apartment | 39 |  |  |
Limited partner capital contribution | $ 10,805,000 |  |  |
Total LIHTCs amount awarded for the project | 1,205,000 |  |  |
Total anticipated LIHTCs amount under the housing project | $ 12,046,000 |  |  |
Project investment amortization period | 10 years |  |  |
Financial Standby Letters of Credit [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Commitments to extend credit |  | $ 44,543,000 | $ 39,468,000 |

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