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Note 25 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Results of Operations [Abstract]                              
Total interest income $ 67,311 $ 63,981 $ 62,423 $ 59,465 $ 56,091 $ 47,886 $ 44,759 $ 42,837 $ 41,652 $ 39,724 $ 37,985 $ 37,933 $ 253,180 $ 191,573 $ 157,294
Total interest expense 4,735 4,896 4,873 4,734 4,275 3,251 2,739 2,830 2,938 3,021 3,121 3,424 19,238 13,095 12,504
Net interest income 62,576 59,085 57,550 54,731 51,816 44,635 42,020 40,007 38,714 36,703 34,864 34,509 233,942 178,478 144,790
Provision for credit losses 4,595 3,262 3,471 3,310 3,700 2,111 3,134 1,934 2,508 1,372 2,357 3,365      
Net interest income after provision for credit losses 57,981 55,823 54,079 51,421 48,116 42,524 38,886 38,073 36,206 35,331 32,507 31,144 219,304 167,599 135,188
Noninterest income 6,492 6,099 6,233 7,804 5,310 4,761 3,811 4,463 4,304 5,236 7,065 8,111 26,628 18,345 24,716
Noninterest expense 28,640 27,405 26,598 28,073 29,352 25,143 22,135 23,098 21,524 21,673 20,685 20,697 110,716 99,728 84,579
Income before income tax expense 35,833 34,517 33,714 31,152 24,074 22,142 20,562 19,438 18,986 18,894 18,887 18,558 135,216 86,216 75,325
Income tax expense 13,485 13,054 12,776 11,734 9,347 8,054 7,618 6,939 6,983 7,137 7,212 6,986 51,049 31,958 28,318
Net income 22,348 21,463 20,938 19,418 14,727 14,088 12,944 12,499 12,003 11,757 11,675 11,572 84,167 54,258 47,007
Preferred stock dividends and discount accretion 62 180 179 180 180 151 142 141 141 142 142 141 601 614 566
Net income available to common shareholders $ 22,286 $ 21,283 $ 20,759 $ 19,238 $ 14,547 $ 13,937 $ 12,802 $ 12,358 $ 11,862 $ 11,615 $ 11,533 $ 11,431 $ 83,566 $ 53,644 $ 46,441
Earnings per common share                              
Basic (1) (in Dollars per share) $ 0.67 [1] $ 0.64 [1] $ 0.62 [1] $ 0.62 [1] $ 0.51 [1] $ 0.54 [1] $ 0.49 [1] $ 0.48 [1] $ 0.46 [1],[2] $ 0.45 [1],[2] $ 0.45 [1],[2] $ 0.45 [1],[2] $ 2.54 $ 2.01 $ 1.81
Diluted (1) (in Dollars per share) $ 0.65 [1] $ 0.63 [1] $ 0.61 [1] $ 0.61 [1] $ 0.49 [1] $ 0.52 [1] $ 0.48 [1] $ 0.47 [1] $ 0.45 [1],[2] $ 0.44 [1],[2] $ 0.44 [1],[2] $ 0.44 [1],[2] $ 2.50 $ 1.95 $ 1.76
[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.
[2] Per share amounts have been adjusted to give effect to the 10% common stock dividend paid on June 14, 2013.