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Note 2 - Acquisitions - Pro Forma Combined Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Guaranty Bank and Trust Company [Member] |  |  |
Net interest income | $ 122,923 | $ 102,902 |
Noninterest income | 32,703 | 34,238 |
Net income | $ 38,728 | $ 27,103 |
Basic (in dollars per share) | $ 2.80 | $ 2.05 |
Diluted (in dollars per share) | $ 2.73 | $ 2.02 |
Community State Bank [Member] |  |  |
Net interest income |  | $ 110,035 | $ 98,483
Noninterest income |  | 34,773 | 31,051
Net income |  | $ 34,137 | $ 22,118
Basic (in dollars per share) |  | $ 2.62 | $ 1.91
Diluted (in dollars per share) |  | $ 2.58 | $ 1.89

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- Definition The pro forma interest income for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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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=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the 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=79982066&loc=d3e1392-128463 + Details
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