Annual report pursuant to Section 13 and 15(d)

Note 23 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details)

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Note 23 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest income $ 98,187 $ 101,130 $ 97,787 $ 93,699 $ 90,164 $ 84,058 $ 78,396 $ 74,009 $ 390,803 $ 326,627 $ 262,756
Interest expense 22,410 28,125 27,702 24,921 21,306 17,195 13,874 11,573 103,158 63,948 35,333
Net interest income 75,777 73,005 70,085 68,778 68,858 66,863 64,522 62,436 287,645 262,679 227,423
Provision for loan losses 5,884 6,985 4,884 4,885 6,518 6,624 4,121 4,139 22,638 21,402 23,225
Net income available to common stockholders $ 41,005 $ 37,563 $ 35,602 $ 35,010 $ 36,205 $ 34,560 $ 33,509 $ 32,603 $ 149,180 $ 136,877 $ 93,030
Net income per common share, basic (in dollars per share) $ 0.77 $ 0.70 $ 0.67 $ 0.65 $ 0.68 $ 0.65 $ 0.63 $ 0.61 $ 2.79 $ 2.57 $ 1.76
Net income per common share, diluted (in dollars per share) $ 0.76 $ 0.69 $ 0.66 $ 0.65 $ 0.67 $ 0.64 $ 0.62 $ 0.60 $ 2.76 $ 2.53 $ 1.72