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Note 2 - Mergers and Acquisitions - Pro Forma Combined Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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
Noninterest income |  |  | 34,773
Net income |  |  | $ 34,137
Basic (in dollars per share) |  |  | $ 2.62
Diluted (in dollars per share) |  |  | $ 2.58
Springfield Bancshares |  |  |
Net interest income | $ 153,229 | $ 136,190 |
Noninterest income | 42,538 | 32,395 |
Net income | $ 49,542 | $ 42,316 |
Basic (in dollars per share) | $ 3.17 | $ 2.82 |
Diluted (in dollars per share) | $ 3.11 | $ 2.75 |
Bates Companies [Member] |  |  |
Net interest income | $ 142,368 | $ 116,029 |
Noninterest income | 44,455 | 33,044 |
Net income | $ 44,032 | $ 35,627 |
Basic (in dollars per share) | $ 2.98 | $ 2.67 |
Diluted (in dollars per share) | $ 2.92 | $ 2.60 |

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