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Mergers and Acquisitions - (Details Textual) $ in Thousands | Jan. 17, 2017 shares | Apr. 01, 2016 USD ($) branch shares | Mar. 31, 2017 USD ($) branch | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($)
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill resulting from merger |  |  | $ 470,534 | $ 470,534 | $ 449,425
Metropolitan Bancgroup, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares to be issued per each common stock share of Metropolitan common stock (in shares) | shares | 0.6066 |  |  |  |
Number of offices in operation | branch |  |  | 8 |  |
Assets acquired |  |  | $ 1,164,500 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets |  |  | 929,700 |  |
Deposits |  |  | $ 945,100 |  |
KeyWorth Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of offices in operation | branch |  | 6 |  |  |
Assets acquired |  | $ 415,232 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets |  | 272,330 |  |  |
Transaction value |  | 58,884 |  |  |
Payment to stock option holders |  | $ 3,594 |  |  |
Voting interest acquired (percent) |  | 100.00% |  |  |
Intangible assets, including goodwill |  | $ 22,643 |  |  |
Goodwill resulting from merger |  | 20,633 |  |  |
Core deposit intangible |  | $ 2,010 |  |  |
Weighted average useful life (in years) |  | 10 years |  |  |
KeyWorth Bank | Core Deposits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Deposits |  | $ 348,961 |  |  |
KeyWorth Bank | Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued to common shareholders (shares) | shares |  | 1,680,021 |  |  |

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