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Fair Value Disclosures (Summary Of Gains (Losses) Due To Changes In Instrument Specific Credit Risk For Loans and Other Receivables And Loan Commitments Measured At Fair Value Under Fair Value Option) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financial Instruments [Line Items]        
Loans and other receivables $ 24,846 $ (24,874) $ 27,715 $ (48,658)
Financial Instruments Sold [Member]        
Financial Instruments [Line Items]        
Loans 3,436 212 (7,286) 229
Loan commitments 82 4,769 229 2,196
Long-term Debt [Member]        
Financial Instruments [Line Items]        
Loan commitments 5,638 (4,093) (14,141) (7,848)
Other changes in fair value (1,854) 4,474 2,786 15,225
Short-term Borrowings [Member]        
Financial Instruments [Line Items]        
Loan commitments 19 0 1 0
Other changes in fair value $ (2,570) $ 0 $ (37) $ 0