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Loans and Leases (Troubled debt in text) (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Gross loans and leases receivable held to maturity $ 5,484,759,000 $ 5,003,866,000
Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Gross loans and leases receivable held to maturity 0  
Loss    
Financing Receivable, Recorded Investment [Line Items]    
Gross loans and leases receivable held to maturity $ 0