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Fair Value of Financial Instruments (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 944,500,000 $ 554,300,000
Short-term Debt 0 0
Time deposits 475,000,000 0
Balance of impaired loans 6,793,000 6,786,000
Specific reserves and other write downs on impaired loans 3,100,000 3,000,000
Troubled debt restructured loans balance 2,084,000 2,947,000
Troubled debt restructured loans, specific reserve $ 1,000,000 1,500,000
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%  
Measurement Input, Default Rate [Member] | Performing Financial Instruments [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment in unconsolidated entity, measurement input | item 1  
Measurement Input, Discount Rate [Member] | Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment in unconsolidated entity, measurement input | item 5.84  
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans $ 3,651,000 $ 3,747,000