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Note 23 - Quarterly Results of Operations (Unaudited) - Selected Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest income | $ 130,668 | $ 124,155 | $ 121,902 | $ 122,345 | $ 119,519 | $ 116,867 | $ 112,386 | $ 104,934 |  |  |
Interest expense | 20,766 | 20,331 | 20,126 | 19,977 | 20,103 | 19,221 | 17,632 | 17,008 | $ 81,200 | $ 73,964 | $ 75,866
Net interest income | 109,902 | 103,824 | 101,776 | 102,368 | 99,416 | 97,646 | 94,754 | 87,926 | 417,870 | 379,742 | 342,781
Provision/(reversal) for loan losses |  |  | (5,150) | (10,500) | (3,000) | (1,250) | (2,150) | (5,000) | (15,650) | (11,400) | (10,800)
Net-interest income after reversal for loan losses | 109,902 | 103,824 | 106,926 | 112,868 | 102,416 | 98,896 | 96,904 | 92,926 | 433,520 | 391,142 | 353,581
Non-interest income | 7,961 | 8,811 | 9,057 | 7,541 | 9,350 | 9,156 | 5,619 | 8,549 | 33,370 | 32,674 | 40,527
Non-interest expense | 53,503 | 50,737 | 68,879 | 51,571 | 53,533 | 57,471 | 47,585 | 44,131 | 224,690 | 202,720 | 174,313
Income before income tax expense | 64,360 | 61,898 | 47,104 | 68,838 | 58,233 | 50,581 | 54,938 | 57,344 | 242,200 | 221,096 | 219,795
Income tax expense | 16,345 | 15,808 | 12,273 | 22,675 | 16,787 | 12,098 | 9,738 | 21,364 | 67,101 | 59,987 | 81,965
Net income | $ 48,015 | $ 46,090 | $ 34,831 | $ 46,163 | $ 41,446 | $ 38,483 | $ 45,200 | $ 35,980 | $ 175,099 | $ 161,109 | $ 137,830
Basic (in dollars per share) | $ 0.61 | $ 0.58 | $ 0.44 | $ 0.58 | $ 0.51 | $ 0.47 | $ 0.57 | $ 0.45 | $ 2.21 | $ 2 | $ 1.73
Diluted (in dollars per share) | $ 0.60 | $ 0.58 | $ 0.44 | $ 0.57 | $ 0.51 | $ 0.47 | $ 0.56 | $ 0.45 | $ 2.19 | $ 1.98 | $ 1.72

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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