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Loans and Leases - Impaired Loans (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 15,000,000 $ 15,000,000
Unpaid Principal Balance 15,000,000 15,000,000
Related Allowance 0 0
Loans and leases, allowance for losses 51,000,000 53,000,000
Commercial and Financial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 15,000,000 15,000,000
Unpaid Principal Balance 15,000,000 15,000,000
Related Allowance 0 0
Average Recorded Investment 15,000,000  
Interest Income Recognized 0  
Senior Secured Bank Loans | Commercial and Financial    
Financing Receivable, Impaired [Line Items]    
Loans and leases, allowance for losses $ 195,000 $ 195,000