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Goodwill and Other Intangible Assets (Details Textuals) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2018 | Feb. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 1,166,665,000 | $ 1,166,665,000 |  | $ 976,239,000
Goodwill, Impairment Loss |  |  |  | 0 | $ 0 |
Bank Mutual |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  | $ 173,000,000 |  | 173,000,000 |  |
Additions to finite-lived intangible assets |  |  | 58,000,000 |  |  |
Diversified Insurance Solutions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 10,000,000 |  |
Additions to finite-lived intangible assets |  | $ 8,000,000 |  |  |  |
Anderson Insurance Investment Agency [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired | $ 7,000,000 |  | 7,000,000 |  |  |
Additions to finite-lived intangible assets | $ 3,000,000 |  | $ 3,000,000 |  |  |

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