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Fair Value Measurements (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 30, 2014
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount   $ 0   $ 0 $ 0 $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount   0   0 0 0  
Investment in unconsolidated entity             $ 31,294,000
Transfer of loans from investment in unconsolidated entity upon its dissolution     $ 22,900,000   22,926,000    
Transfer to Other Real Estate     2,100,000   2,145,000 $ 3,780,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0   $ 0      
Cash and cash equivalents   317,300,000     317,300,000   345,500,000
Collateral dependent loans   6,900,000     6,900,000    
Specific reserves and other write downs on impaired loans   $ 1,812,000     $ 1,812,000   3,177,000
Number of troubled debt restructured loans | loan   9     9    
Troubled debt restructured loans balance         $ 1,439,000   1,631,000
Troubled debt restructured loans, specific reserve   $ 626,000     626,000    
Other real estate owned   2,145,000     $ 2,145,000   0
Minimum [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Estimated selling costs         7.00%    
Maximum [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Estimated selling costs         10.00%    
Walnut Street [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Loans, face value $ 267,600,000            
Proceeds from Sale of Loans Receivable 209,600,000            
Notes Payable $ 193,600,000            
Number of notes | loan 2            
Walnut Street [Member] | Senior Debt [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Senior Notes $ 178,200,000            
Interest rate (in hundredths) 1.50%            
Walnut Street [Member] | Junior Subordinated Debt [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Junior Subordinated Notes $ 15,400,000            
Interest rate (in hundredths) 10.00%            
Fair Value, Measurements, Nonrecurring [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Collateral dependent loans [1]   5,068,000     $ 5,068,000   $ 9,578,000
Other real estate owned   $ 2,145,000     $ 2,145,000    
Reclassification, Other [Member]              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Investment in unconsolidated entity     $ (25,000,000.0)        
[1] The method of valuation approach for the collateral dependent loans was the market value approach based upon appraisals of the underlying collateral by external appraisers, reduced by 7% to 10% for estimated selling costs. Intangible assets are valued based upon internal analyses.