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Mergers and Acquisitions - Summary of the Allocation of Purchase Price to Assets and Liabilities Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands | Jul. 01, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |
Goodwill resulting from merger |  | $ 611,046 | $ 611,046 | $ 470,534
Metropolitan Bancgroup, Inc. |  |  |  |
Purchase Price: |  |  |  |
Shares issued to common shareholders (in shares) | 4,883,182 |  |  |
Purchase price per share (usd per share) | $ 43.74 |  |  |
Value of stock paid | $ 213,590 |  |  |
Cash paid for fractional shares | 5 |  |  |
Cash settlement for stock options | 4,764 |  |  |
Deal charges, net of taxes | 1,102 |  |  |
Total Purchase Price | 219,461 |  |  |
Increase (decrease) to net assets as a result of fair value adjustments to assets acquired and liabilities assumed: |  |  |  |
Securities | (731) |  |  |
Mortgage loans held for sale | 30 |  |  |
Loans, net of Metropolitan’s allowance for loan losses | (13,071) |  |  |
Premises and equipment | (4,629) |  |  |
Intangible assets, net of Metropolitan’s existing intangibles | 2,340 |  |  |
Other real estate owned | (1,251) |  |  |
Other assets | 2,731 |  |  |
Deposits | (3,603) |  |  |
Borrowings | (1,294) |  |  |
Other liabilities | 3,930 |  |  |
Deferred income taxes | 5,244 |  |  |
Total Net Assets Acquired | 78,949 |  |  |
Goodwill resulting from merger | 140,512 |  |  |
Metropolitan Bancgroup, Inc. | Metropolitan Bancgroup, Inc. |  |  |  |
Net Assets Acquired: |  |  |  |
Stockholders’ equity at acquisition date | $ 89,253 |  |  |

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