Accounting Policies and Basis of Presentation Accounting Policies and Basis of Presentation (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 14, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain on acquisition		$ 3,290	$ 0	$ 4,994	$ 42,930
North Milwaukee State Bank
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period		$ 1,200
Gain on acquisition	$ 2,872