Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 11, 2016	Dec. 31, 2015	Feb. 13, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,665,896	$ 2,092,936
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			$ 35,416		$ 154,496
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	21,398	25,067
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(61,443)	(113,516)
Ending balance	945,887	$ 1,252,545
Loans on the Cost Recovery Method
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on cost recovery method	1,100			$ 5,300
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	593,614
Ending balance	594,227
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	356,902
Ending balance	351,660
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	33,880
Ending balance	32,799
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	525,468
Ending balance	526,776
Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	302,158
Ending balance	298,662
Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	52,471
Ending balance	50,574
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	17,076
Ending balance	18,050
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	15,182
Ending balance	14,742
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	2,273
Ending balance	2,424
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			35,416
North Milwaukee State Bank | Commercial
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			28,375
North Milwaukee State Bank | Noncommercial
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			7,041
North Milwaukee State Bank | Construction and land development | Commercial
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			139
North Milwaukee State Bank | Mortgage | Commercial
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			25,237
North Milwaukee State Bank | Mortgage | Noncommercial
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			6,128
North Milwaukee State Bank | Revolving mortgage | Noncommercial
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			234
North Milwaukee State Bank | Other commercial real estate | Commercial
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			1,479
North Milwaukee State Bank | Commercial and industrial | Commercial
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			1,520
North Milwaukee State Bank | Consumer | Noncommercial
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			$ 679
PCI Loans
Carrying Value of Acquired Impaired Loans [Roll Forward]
Beginning balance	950,516
Ending balance	945,887
Nonaccruing	$ 7,300			$ 7,600