Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 01, 2016	Mar. 11, 2016	Dec. 31, 2015	Feb. 13, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			$ 241,392
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,475,149	$ 1,788,136
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	80,690			$ 80,690		$ 154,496
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	59,066	91,642
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(222,072)	(388,572)
Ending balance	868,200	$ 1,044,064
Loans on the Cost Recovery Method
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on cost recovery method	545				$ 5,300
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			134,468
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	58,934
Ending balance	543,705
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			106,924
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	21,756
Ending balance	324,495
Construction and land development | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			3,066
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	684
Ending balance	23,138
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	340
Ending balance	83
Mortgage | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			77,455
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	50,372
Ending balance	491,180
Mortgage | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			16,839
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	18,934
Ending balance	278,872
Revolving mortgage | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			9,867
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	1,238
Ending balance	43,509
Other commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			22,174
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	2,629
Ending balance	14,783
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			31,773
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	3,630
Ending balance	11,437
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	1,619
Ending balance	3,167
Consumer | Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of loans acquired			$ 80,218
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	1,244
Ending balance	2,031
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	868,200
Nonaccruing	$ 4,100				$ 7,600