Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 1,123,239	$ 1,186,498	$ 1,109,933	$ 1,029,426
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	697,045	726,123
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	48,208	78,079
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	611,505	577,518
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	14,353	40,193
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	20,382	27,254
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	2,597	3,079
Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	426,194	460,375
Noncommerical | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	345	912
Noncommerical | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	358,307	382,340
Noncommerical | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	64,340	74,109
Noncommerical | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 3,202	$ 3,014