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Business Combinations Pro Forma Information (Details) - Integrity Bancshares, Inc. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition, Pro Forma Information [Abstract] |  |
Total revenue | $ 240,581 | $ 232,635
Net income | $ 68,850 | $ 70,001
Earnings per common share |  |
Basic (in USD per share) | $ 1.78 | $ 2.02
Diluted (in USD per share) | $ 1.77 | $ 2.02

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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