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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 |  |  |  |

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