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Guarantees, Commitments, and Contingencies (Narrative) (Details)
 6 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
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