Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 11, 2016	Dec. 31, 2015	Feb. 13, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,614,998	$ 2,025,905
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	950,516	1,186,498
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	80,084		$ 80,084		$ 154,496
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	41,821	59,182
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(150,954)	(276,937)
Ending balance	921,467	$ 1,123,239
Loans on the Cost Recovery Method
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on cost recovery method	568			$ 5,300
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	593,614
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	59,083
Ending balance	576,942
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	356,902
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	21,001
Ending balance	344,525
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	33,880
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	550
Ending balance	27,742
Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	0
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	365
Ending balance	467
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	525,468
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	50,497
Ending balance	513,021
Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	302,158
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	18,122
Ending balance	294,625
Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	52,471
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,258
Ending balance	47,230
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	17,076
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	2,637
Ending balance	20,166
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	15,182
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	3,790
Ending balance	12,854
Other | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	2,008
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,609
Ending balance	3,159
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	2,273
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	1,256
Ending balance	2,203
North Milwaukee State Bank
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			$ 36,914
PCI Loans
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	950,516
Ending balance	921,467
Nonaccruing	$ 3,800			$ 7,600