Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 950,516	$ 1,186,498	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	593,614	726,123
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	33,880	78,079
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	525,468	577,518
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	17,076	40,193
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	15,182	27,254
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	2,008	3,079
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	356,902	460,375
Noncommercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	0	912
Noncommercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	302,158	382,340
Noncommercial | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	52,471	74,109
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 2,273	$ 3,014