Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 13, 2015	Dec. 31, 2014	Jan. 01, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	$ 1,247,343,000	$ 1,270,818,000		$ 1,186,498,000		$ 1,029,426,000
Impaired Financing Receivable, Unpaid Principal Balance	2,092,936,000	1,727,492,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			149,294,000		316,327,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	25,067,000	30,200,000
Carrying Value of Acquired Impaired Loans [Roll Forward]
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(113,516,000)	(105,135,000)
Loans on the Cost Recovery Method
Carrying Value of Acquired Impaired Loans [Roll Forward]
Ending balance	13,000,000			33,400,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	791,756,000			726,123,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			135,604,000
Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	455,587,000			460,375,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			13,690,000
Construction and land development | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	70,049,000			78,079,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			4,221,000
Mortgage | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	653,846,000			577,518,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			125,202,000
Mortgage | Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	380,490,000			382,340,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			12,050,000
Other commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	40,841,000			40,193,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			3,132,000
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	24,134,000			27,254,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			3,049,000
Consumer | Noncommerical
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI loans	3,860,000			3,014,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 1,640,000