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Fair Value Measurements (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 30, 2014
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount   $ 0   $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount   0   0  
Transfers into level 3     $ 100,700,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net   0      
Cash and cash equivalents   301,000,000.0   301,000,000.0 $ 944,500,000
Collateral dependent loans   12,800,000   12,800,000  
Specific reserves and other write downs on impaired loans   $ 2,900,000   $ 2,900,000  
Number of troubled debt restructured loans | loan   11   11  
Troubled debt restructured loans balance       $ 1,661,000 2,084,000
Troubled debt restructured loans, specific reserve   $ 479,000   479,000  
Other real estate owned   0   $ 0 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 Notes [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Senior Notes $ 178,200,000        
Debt Instrument, Interest Rate, Stated Percentage 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        
Debt Instrument, Interest Rate, Stated Percentage 10.00%        
Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Collateral dependent loans [1]   $ 9,922,000   $ 9,922,000 $ 3,651,000
[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.