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Note 25 - Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | 2015 |
(dollars in thousands except per share data) |  | Fourth Quarter |  |  | Third Quarter |  |  | Second Quarter |  |  | First Quarter |
Total interest income |  | $ | 67,311 |  |  | $ | 63,981 |  |  | $ | 62,423 |  |  | $ | 59,465 |
Total interest expense |  |  | 4,735 |  |  |  | 4,896 |  |  |  | 4,873 |  |  |  | 4,734 |
Net interest income |  |  | 62,576 |  |  |  | 59,085 |  |  |  | 57,550 |  |  |  | 54,731 |
Provision for credit losses |  |  | 4,595 |  |  |  | 3,262 |  |  |  | 3,471 |  |  |  | 3,310 |
Net interest income after provision for credit losses |  |  | 57,981 |  |  |  | 55,823 |  |  |  | 54,079 |  |  |  | 51,421 |
Noninterest income |  |  | 6,492 |  |  |  | 6,099 |  |  |  | 6,233 |  |  |  | 7,804 |
Noninterest expense |  |  | 28,640 |  |  |  | 27,405 |  |  |  | 26,598 |  |  |  | 28,073 |
Income before income tax expense |  |  | 35,833 |  |  |  | 34,517 |  |  |  | 33,714 |  |  |  | 31,152 |
Income tax expense |  |  | 13,485 |  |  |  | 13,054 |  |  |  | 12,776 |  |  |  | 11,734 |
Net income |  |  | 22,348 |  |  |  | 21,463 |  |  |  | 20,938 |  |  |  | 19,418 |
Preferred stock dividends and discount accretion |  |  | 62 |  |  |  | 180 |  |  |  | 179 |  |  |  | 180 |
Net income available to common shareholders |  | $ | 22,286 |  |  | $ | 21,283 |  |  | $ | 20,759 |  |  | $ | 19,238 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.67 |  |  | $ | 0.64 |  |  | $ | 0.62 |  |  | $ | 0.62 |
Diluted (1) |  | $ | 0.65 |  |  | $ | 0.63 |  |  | $ | 0.61 |  |  | $ | 0.61 |
|  | 2014 |
(dollars in thousands except per share data) |  | Fourth Quarter |  |  | Third Quarter |  |  | Second Quarter |  |  | First Quarter |
Total interest income |  | $ | 56,091 |  |  | $ | 47,886 |  |  | $ | 44,759 |  |  | $ | 42,837 |
Total interest expense |  |  | 4,275 |  |  |  | 3,251 |  |  |  | 2,739 |  |  |  | 2,830 |
Net interest income |  |  | 51,816 |  |  |  | 44,635 |  |  |  | 42,020 |  |  |  | 40,007 |
Provision for credit losses |  |  | 3,700 |  |  |  | 2,111 |  |  |  | 3,134 |  |  |  | 1,934 |
Net interest income after provision for credit losses |  |  | 48,116 |  |  |  | 42,524 |  |  |  | 38,886 |  |  |  | 38,073 |
Noninterest income |  |  | 5,310 |  |  |  | 4,761 |  |  |  | 3,811 |  |  |  | 4,463 |
Noninterest expense |  |  | 29,352 |  |  |  | 25,143 |  |  |  | 22,135 |  |  |  | 23,098 |
Income before income tax expense |  |  | 24,074 |  |  |  | 22,142 |  |  |  | 20,562 |  |  |  | 19,438 |
Income tax expense |  |  | 9,347 |  |  |  | 8,054 |  |  |  | 7,618 |  |  |  | 6,939 |
Net income |  |  | 14,727 |  |  |  | 14,088 |  |  |  | 12,944 |  |  |  | 12,499 |
Preferred stock dividends and discount accretion |  |  | 180 |  |  |  | 151 |  |  |  | 142 |  |  |  | 141 |
Net income available to common shareholders |  | $ | 14,547 |  |  | $ | 13,937 |  |  | $ | 12,802 |  |  | $ | 12,358 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.51 |  |  | $ | 0.54 |  |  | $ | 0.49 |  |  | $ | 0.48 |
Diluted (1) |  | $ | 0.49 |  |  | $ | 0.52 |  |  | $ | 0.48 |  |  | $ | 0.47 |
|  | 2013 |
(dollars in thousands except per share data) |  | Fourth Quarter |  |  | Third Quarter |  |  | Second Quarter |  |  | First Quarter |
Total interest income |  | $ | 41,652 |  |  | $ | 39,724 |  |  | $ | 37,985 |  |  | $ | 37,933 |
Total interest expense |  |  | 2,938 |  |  |  | 3,021 |  |  |  | 3,121 |  |  |  | 3,424 |
Net interest income |  |  | 38,714 |  |  |  | 36,703 |  |  |  | 34,864 |  |  |  | 34,509 |
Provision for credit losses |  |  | 2,508 |  |  |  | 1,372 |  |  |  | 2,357 |  |  |  | 3,365 |
Net interest income after provision for credit losses |  |  | 36,206 |  |  |  | 35,331 |  |  |  | 32,507 |  |  |  | 31,144 |
Noninterest income |  |  | 4,304 |  |  |  | 5,236 |  |  |  | 7,065 |  |  |  | 8,111 |
Noninterest expense |  |  | 21,524 |  |  |  | 21,673 |  |  |  | 20,685 |  |  |  | 20,697 |
Income before income tax expense |  |  | 18,986 |  |  |  | 18,894 |  |  |  | 18,887 |  |  |  | 18,558 |
Income tax expense |  |  | 6,983 |  |  |  | 7,137 |  |  |  | 7,212 |  |  |  | 6,986 |
Net income |  |  | 12,003 |  |  |  | 11,757 |  |  |  | 11,675 |  |  |  | 11,572 |
Preferred stock dividends and discount accretion |  |  | 141 |  |  |  | 142 |  |  |  | 142 |  |  |  | 141 |
Net income available to common shareholders |  | $ | 11,862 |  |  | $ | 11,615 |  |  | $ | 11,533 |  |  | $ | 11,431 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (1 & 2) |  | $ | 0.46 |  |  | $ | 0.45 |  |  | $ | 0.45 |  |  | $ | 0.45 |
Diluted (1 & 2) |  | $ | 0.45 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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