Commitments and Contingencies (Schedule of Commitments to Extend Credit) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 6,385,147	$ 6,136,313
Commercial Loan
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	3,992,089	3,748,690
Consumer Loan
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 2,393,058	$ 2,387,623