Annual report pursuant to Section 13 and 15(d)

Note 26 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details)

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Note 26 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest income $ 72,060 $ 67,641 $ 63,538 $ 59,517 $ 56,200 $ 54,691 $ 52,050 $ 49,961 $ 262,756 $ 212,902 $ 179,975
Interest expense 10,652 9,245 7,971 7,465 7,091 6,773 6,159 5,782 35,333 25,805 17,704
Net interest income 61,408 58,396 55,567 52,052 49,109 47,918 45,891 44,179 227,423 187,097 162,271
Provision for loan losses 9,055 4,803 4,381 4,986 4,075 3,464 3,800 2,059 23,225 13,398 12,847
Net income available to common stockholders $ 21,119 $ 25,259 $ 24,133 $ 22,519 $ 21,714 $ 20,909 $ 18,853 $ 19,956 $ 93,030 $ 81,432 $ 63,260
Net income per common share, basic (in dollars per share) $ 0.40 $ 0.48 $ 0.46 $ 0.42 $ 0.41 $ 0.40 $ 0.36 $ 0.38 $ 1.76 $ 1.55 $ 1.23
Net income per common share, diluted (in dollars per share) $ 0.39 $ 0.47 $ 0.45 $ 0.41 $ 0.40 $ 0.39 $ 0.36 $ 0.37 $ 1.72 $ 1.52 $ 1.20