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Fair Values Schedule of Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Book Value Of Impaired Loans Carried At Fair Value $ 6,379 $ 11,783  
Partial Charge-Offs On Impaired Loans carried at Fair Value 3,681 10,512  
Impaired Financing Receivable, Related Allowance 548 4,191  
Impaired loans carried at fair value 5,983 9,496  
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment 64,047 68,881  
Partial Charge-offs on Impaired Loans carried at Cost 21,262 18,193  
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount 63,895 66,977  
Recorded investment 70,426 80,664 $ 73,712
Partial charge-offs on impaired loans 24,943 28,705  
Individually evaluated for impairment 548 4,191  
Impaired Financing Receivable, Carrying Value 69,878 76,473  
Financing Receivable, not collateral dependent [Domain]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Related Allowance 152 1,904  
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Related Allowance $ 396 $ 2,287