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Acquisitions - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 01, 2018 | Feb. 01, 2018 | Jan. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Value of stock transaction |  |  |  |  | $ 137,000 | $ 0
Bank Mutual |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares received by shareholders (in shares) |  | 0.422 |  |  |  |
Number of shares issued |  |  | 19,500,000 |  |  |
Value of stock transaction |  | $ 482,000,000 |  |  |  |
Goodwill acquired |  | $ 173,000,000 |  |  | 173,000,000 |
Amortization period |  | 10 years |  |  |  |
Additions to finite-lived intangible assets |  |  |  | $ 58,000,000 |  |
BKMU Assets Acquired Liabilities Assumed IncreaseDecrease [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | $ 6,000,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, OREO |  | $ 1,000,000 |  |  |  |
Business Combination, Acquired Receivables, IncreaseDecrease |  | less than $1 million |  |  |  |
Anderson Insurance Investment Agency [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired | $ 7,000,000 |  |  | 7,000,000 |  |
Amortization period | 7 years |  |  |  |  |
Value of acquisition | $ 10,000,000 |  |  |  |  |
Additions to finite-lived intangible assets | $ 3,000,000 |  |  | 3,000,000 |  |
Diversified Insurance Solutions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 10,000,000 |
Amortization period |  | 10 years |  |  |  |
Value of acquisition |  |  |  | $ 19,000,000 |  |
Additions to finite-lived intangible assets |  | $ 8,000,000 |  |  |  |

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