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Note 25 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Total interest income | $ 75,795 |  | $ 72,431 |  | $ 69,772 |  | $ 67,807 |  | $ 67,311 |  | $ 63,981 |  | $ 62,423 |  | $ 59,465 |  | $ 56,091 |  | $ 47,886 |  | $ 44,759 |  | $ 42,837 |  | $ 285,805 | $ 253,180 | $ 191,573
Total interest expense | 8,771 |  | 7,703 |  | 5,950 |  | 5,216 |  | 4,735 |  | 4,896 |  | 4,873 |  | 4,734 |  | 4,275 |  | 3,251 |  | 2,739 |  | 2,830 |  | 27,640 | 19,238 | 13,095
Net interest income | 67,024 |  | 64,728 |  | 63,822 |  | 62,591 |  | 62,576 |  | 59,085 |  | 57,550 |  | 54,731 |  | 51,816 |  | 44,635 |  | 42,020 |  | 40,007 |  | 258,165 | 233,942 | 178,478
Provision for credit losses | 2,112 |  | 2,288 |  | 3,888 |  | 3,043 |  | 4,595 |  | 3,262 |  | 3,471 |  | 3,310 |  | 3,700 |  | 2,111 |  | 3,134 |  | 1,934 |  |  |  |
Net interest income after provision for credit losses | 64,912 |  | 62,440 |  | 59,934 |  | 59,548 |  | 57,981 |  | 55,823 |  | 54,079 |  | 51,421 |  | 48,116 |  | 42,524 |  | 38,886 |  | 38,073 |  | 246,834 | 219,304 | 167,599
Noninterest income | 7,014 |  | 6,405 |  | 7,575 |  | 6,290 |  | 6,492 |  | 6,099 |  | 6,233 |  | 7,804 |  | 5,310 |  | 4,761 |  | 3,811 |  | 4,463 |  | 27,284 | 26,628 | 18,345
Noninterest expense | 29,780 |  | 28,838 |  | 28,295 |  | 28,103 |  | 28,640 |  | 27,405 |  | 26,598 |  | 28,073 |  | 29,352 |  | 25,143 |  | 22,135 |  | 23,098 |  | 115,016 | 110,716 | 99,728
Income before income tax expense | 42,146 |  | 40,007 |  | 39,214 |  | 37,735 |  | 35,833 |  | 34,517 |  | 33,714 |  | 31,152 |  | 24,074 |  | 22,142 |  | 20,562 |  | 19,438 |  | 159,102 | 135,216 | 86,216
Income Tax Expense | 16,429 |  | 15,484 |  | 15,069 |  | 14,413 |  | 13,485 |  | 13,054 |  | 12,776 |  | 11,734 |  | 9,347 |  | 8,054 |  | 7,618 |  | 6,939 |  | 61,395 | 51,049 | 31,958
Net Income | 25,717 |  | 24,523 |  | 24,145 |  | 23,322 |  | 22,348 |  | 21,463 |  | 20,938 |  | 19,418 |  | 14,727 |  | 14,088 |  | 12,944 |  | 12,499 |  | 97,707 | 84,167 | 54,258
Net income available to common shareholders | $ 25,717 |  | $ 24,523 |  | $ 24,145 |  | $ 23,322 |  | $ 22,286 |  | $ 21,283 |  | $ 20,759 |  | $ 19,238 |  | $ 14,547 |  | $ 13,937 |  | $ 12,802 |  | $ 12,358 |  | $ 97,707 | $ 83,566 | $ 53,644
Earnings Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.76 | [1] | $ 0.73 | [1] | $ 0.72 | [1] | $ 0.70 | [1] | $ 0.67 | [1] | $ 0.64 | [1] | $ 0.62 | [1] | $ 0.62 | [1] | $ 0.51 | [1] | $ 0.54 | [1] | $ 0.49 | [1] | $ 0.48 | [1] | $ 2.91 | $ 2.54 | $ 2.01
Diluted (in dollars per share) | $ 0.75 | [1] | $ 0.72 | [1] | $ 0.71 | [1] | $ 0.68 | [1] | $ 0.65 | [1] | $ 0.63 | [1] | $ 0.61 | [1] | $ 0.61 | [1] | $ 0.49 | [1] | $ 0.52 | [1] | $ 0.48 | [1] | $ 0.47 | [1] | $ 2.86 | $ 2.50 | $ 1.95
Total interest income | $ 75,795 |  | $ 72,431 |  | $ 69,772 |  | $ 67,807 |  | $ 67,311 |  | $ 63,981 |  | $ 62,423 |  | $ 59,465 |  | $ 56,091 |  | $ 47,886 |  | $ 44,759 |  | $ 42,837 |  | $ 285,805 | $ 253,180 | $ 191,573
Total interest expense | 8,771 |  | 7,703 |  | 5,950 |  | 5,216 |  | 4,735 |  | 4,896 |  | 4,873 |  | 4,734 |  | 4,275 |  | 3,251 |  | 2,739 |  | 2,830 |  | 27,640 | 19,238 | 13,095
Net interest income | 67,024 |  | 64,728 |  | 63,822 |  | 62,591 |  | 62,576 |  | 59,085 |  | 57,550 |  | 54,731 |  | 51,816 |  | 44,635 |  | 42,020 |  | 40,007 |  | 258,165 | 233,942 | 178,478
Provision for credit losses | 2,112 |  | 2,288 |  | 3,888 |  | 3,043 |  | 4,595 |  | 3,262 |  | 3,471 |  | 3,310 |  | 3,700 |  | 2,111 |  | 3,134 |  | 1,934 |  |  |  |
Net interest income after provision for credit losses | 64,912 |  | 62,440 |  | 59,934 |  | 59,548 |  | 57,981 |  | 55,823 |  | 54,079 |  | 51,421 |  | 48,116 |  | 42,524 |  | 38,886 |  | 38,073 |  | 246,834 | 219,304 | 167,599
Noninterest income | 7,014 |  | 6,405 |  | 7,575 |  | 6,290 |  | 6,492 |  | 6,099 |  | 6,233 |  | 7,804 |  | 5,310 |  | 4,761 |  | 3,811 |  | 4,463 |  | 27,284 | 26,628 | 18,345
Noninterest expense | 29,780 |  | 28,838 |  | 28,295 |  | 28,103 |  | 28,640 |  | 27,405 |  | 26,598 |  | 28,073 |  | 29,352 |  | 25,143 |  | 22,135 |  | 23,098 |  | 115,016 | 110,716 | 99,728
Income before income tax expense | 42,146 |  | 40,007 |  | 39,214 |  | 37,735 |  | 35,833 |  | 34,517 |  | 33,714 |  | 31,152 |  | 24,074 |  | 22,142 |  | 20,562 |  | 19,438 |  | 159,102 | 135,216 | 86,216
Income Tax Expense | 16,429 |  | 15,484 |  | 15,069 |  | 14,413 |  | 13,485 |  | 13,054 |  | 12,776 |  | 11,734 |  | 9,347 |  | 8,054 |  | 7,618 |  | 6,939 |  | 61,395 | 51,049 | 31,958
Net Income | 25,717 |  | 24,523 |  | 24,145 |  | 23,322 |  | 22,348 |  | 21,463 |  | 20,938 |  | 19,418 |  | 14,727 |  | 14,088 |  | 12,944 |  | 12,499 |  | 97,707 | 84,167 | 54,258
Preferred Stock Dividends |  |  |  |  |  |  |  |  | 62 |  | 180 |  | 179 |  | 180 |  | 180 |  | 151 |  | 142 |  | 141 |  |  | 601 | 614
Net income available to common shareholders | $ 25,717 |  | $ 24,523 |  | $ 24,145 |  | $ 23,322 |  | $ 22,286 |  | $ 21,283 |  | $ 20,759 |  | $ 19,238 |  | $ 14,547 |  | $ 13,937 |  | $ 12,802 |  | $ 12,358 |  | $ 97,707 | $ 83,566 | $ 53,644
[1] | Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.

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