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Mergers and Acquisitions - Narrative (Details) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2017 USD ($) branch shares | Sep. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) branch | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Assets |  |  | $ 10,238,313,000 | $ 9,829,981,000 | $ 8,764,711,000
Deposits |  |  | 8,357,769,000 | 7,921,075,000 |
Goodwill resulting from merger |  |  | $ 611,046,000 | $ 611,046,000 | $ 470,534,000
Metropolitan Bancgroup, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash settlement for stock options | $ 4,764,000 |  |  |  |
Transaction value | $ 219,461,000 |  |  |  |
Shares issued to common shareholders (in shares) | shares | 4,883,182 |  |  |  |
Voting interest acquired (percent) | 100.00% |  |  |  |
Number of locations acquired | branch | 8 |  |  |  |
Intangible assets, including goodwill | $ 147,478,000 |  |  |  |
Goodwill resulting from merger | 140,512,000 |  |  |  |
Core deposit intangible | $ 6,966,000 |  |  |  |
Weighted average useful life (in years) | 10 years |  |  |  |
Scenario, Forecast | Brand Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Entity shares issued per acquiree share (in shares) | shares |  | 32.87 |  |  |
Amount paid per acquiree share (in dollars per share) | $ / shares |  | $ 77.50 |  |  |
Cash settlement for stock options |  | $ 1,550 |  |  |
Brand |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of locations | branch |  |  | 13 |  |
Assets |  |  | $ 2,400,000,000 |  |
Loans |  |  | 1,910,000,000 |  |
Deposits |  |  | $ 1,920,000,000 |  |

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