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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 15,000  
Unpaid Principal Balance 15,000  
Related Allowance 0  
Average Recorded Investment 15,000  
Interest Revenue Recognized 0  
Loans and leases, allowance for losses 53,000 $ 46,000
Commercial and Financial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 15,000  
Unpaid Principal Balance 15,000  
Related Allowance 0  
Average Recorded Investment 15,000  
Interest Revenue Recognized 0  
Senior Secured Bank Loans | Commercial and Financial    
Financing Receivable, Impaired [Line Items]    
Loans and leases, allowance for losses $ 195