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Business Combinations - Pro Forma Information (Details) - Integrity Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |
Total revenue(1) | [1] | $ 60,307 | $ 57,921 | $ 118,992 | $ 115,045
Net income | [2] | $ 18,816 | $ 17,765 | $ 32,728 | $ 33,697
Earnings per common share: |  |  |  |  |
Basic (in USD per share) | [2] | $ 0.54 | $ 0.51 | $ 0.95 | $ 0.97
Diluted (in USD per share) | [2] | $ 0.54 | $ 0.51 | $ 0.94 | $ 0.97
[1] | Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.
[2] | Excludes merger expenses

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