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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.