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Acquisitions - Bank Mutual Acquisition (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Feb. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,166,665 |  | $ 976,239 |
Total liabilities | $ 2,828,448 |  |  | $ 0
Purchase Accounting Adjustments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 0 |  |
Investment securities |  | (6,238) |  |
Federal Home Loan Bank stock, at cost |  | 0 |  |
Loans |  | (48,043) |  |
Premises and equipment, net |  | 5,180 |  |
Bank owned life insurance |  | (24) |  |
Goodwill |  |  |  |
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet) |  | 58,100 |  |
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet) |  | 989 |  |
Others assets |  | 6,153 |  |
Deposits |  | 2,498 |  |
Other borrowings |  | 1,875 |  |
Other liabilities |  | 4,370 |  |
BKMU Assets Acquired, Liabilities Assumed |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  | 78,052 |  |
Investment securities |  | 452,867 |  |
Federal Home Loan Bank stock, at cost |  | 20,026 |  |
Loans |  | 1,875,877 |  |
Premises and equipment, net |  | 44,939 |  |
Bank owned life insurance |  | 65,390 |  |
Goodwill |  | 173,243 |  |
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet) |  | 58,100 |  |
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet) |  | 5,638 |  |
Others assets |  | 46,257 |  |
Total assets |  | 2,820,389 |  |
Deposits |  | 1,840,950 |  |
Other borrowings |  | 431,886 |  |
Other liabilities |  | 65,864 |  |
Total liabilities |  | 2,338,701 |  |
Total consideration paid |  | $ 481,688 |  |

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