Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	May 05, 2017	Jan. 13, 2017	May 06, 2016	Mar. 11, 2016	Dec. 31, 2015
Carrying Value of Acquired Impaired Loans [Roll Forward]
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	$ (322,447)	$ (298,602)
Outstanding principal balance	1,175,441	1,266,395
PCI Loans	762,998	809,169					$ 950,516
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	199,682	80,690
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion	76,594	76,565
Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	396,938	499,970
Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	366,060	309,199
Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	13,654	20,766
Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	358,103	453,013
Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	17,124	12,645
Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	6,374	11,844
Other | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	1,683	1,702
Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	2,190	1,772
PCI Loans
Loans and Leases Receivable Disclosure [Abstract]
Nonaccruing	624	3,451
PCI Loans | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	366,060	309,199
PCI Loans | Construction and land development | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	13,654	20,766
PCI Loans | Construction and land development | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	644	0
PCI Loans | Mortgage | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	358,103	453,013
PCI Loans | Mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	299,318	268,777
PCI Loans | Revolving mortgage | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	63,908	38,650
PCI Loans | Other commercial real estate | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	17,124	12,645
PCI Loans | Commercial and industrial | Commercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	6,374	11,844
PCI Loans | Consumer | Noncommercial
Carrying Value of Acquired Impaired Loans [Roll Forward]
PCI Loans	$ 2,190	$ 1,772
Harvest Community Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition				$ 111,250
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition				101,802
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value				85,149
Harvest Community 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				54,976
Harvest Community 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				30,173
Harvest Community 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				7,061
Harvest Community Bank | Construction and land development | 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				0
Harvest Community 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				21,836
Harvest Community 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				25,857
Harvest Community 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				3,434
Harvest Community 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				6,404
Harvest Community 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				19,675
Harvest Community Bank | Other | 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				0
Harvest Community 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				$ 882
Guaranty Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition			$ 158,456
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition			142,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value			114,533
Guaranty 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			701
Guaranty 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			113,832
Guaranty 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			55
Guaranty Bank | Construction and land development | 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			26
Guaranty 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			644
Guaranty 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			80,475
Guaranty 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			33,319
Guaranty 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			0
Guaranty 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			2
Guaranty Bank | Other | 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			0
Guaranty 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			$ 12
First CornerStone Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					$ 58,036
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					50,665
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value					43,776
First CornerStone 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					29,275
First CornerStone 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					14,501
First CornerStone 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					559
First CornerStone Bank | Construction and land development | 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					340
First CornerStone 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					24,156
First CornerStone 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					12,518
First CornerStone 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					1,117
First CornerStone 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					1,158
First CornerStone 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					1,783
First CornerStone Bank | Other | 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					1,619
First CornerStone 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					$ 526
North Milwaukee State Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition						$ 50,613
Carrying Value of Acquired Impaired Loans [Roll Forward]
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition						42,513
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value						36,914
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						29,659
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						7,255
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						125
North Milwaukee State Bank | Construction and land development | 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						0
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						26,216
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						6,416
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						121
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						1,471
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						1,847
North Milwaukee State Bank | Other | 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						0
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						$ 718