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Note 24 - Quarterly Results of Operations (Unaudited) - Selected 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 | $ 191,226 | $ 197,831 | $ 192,449 | $ 187,761 | $ 183,869 | $ 176,866 | $ 167,520 | $ 159,700 |  |  |  |  |  |
Interest expense | 50,015 | 50,831 | 49,070 | 44,445 | 38,428 | 31,782 | 27,489 | 24,357 | $ 194,361 |  | $ 122,056 |  | $ 80,442 |
Net interest income | 141,211 | 147,000 | 143,379 | 143,316 | 145,441 | 145,084 | 140,031 | 135,343 | 574,906 |  | 565,899 |  | 495,709 |
Provision/(reversal) for loan losses | (5,000) | (2,000) | 0 | 0 | 0 | (1,500) | 0 | (3,000) | (7,000) |  | (4,500) |  | (2,500) |
Net-interest income after reversal for loan losses | 146,211 | 149,000 | 143,379 | 143,316 | 145,441 | 146,584 | 140,031 | 138,343 | 581,906 |  | 570,399 |  | 498,209 |
Non-interest income | 8,648 | 10,388 | 12,794 | 12,921 | 10,795 | 7,835 | 7,767 | 5,310 | 44,751 | [1] | 31,707 | [1] | 36,297 | [1]
Non-interest expense | 71,192 | 65,580 | 69,546 | 70,970 | 74,395 | 65,964 | 63,088 | 60,971 | 277,288 |  | 264,419 |  | 236,199 |
Income before income tax expense | 83,667 | 93,808 | 86,627 | 85,267 | 81,841 | 88,455 | 84,710 | 82,682 |  |  |  |  |  |
Total income tax expense, amount | 16,290 | 20,973 | 14,383 | 18,588 | 17,193 | 18,698 | 11,046 | 18,866 | 70,234 |  | 65,802 |  | 122,265 |
Net income | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 64,648 | $ 69,757 | $ 73,664 | $ 63,816 | $ 279,135 |  | $ 271,885 |  | $ 176,042 |
Basic (in dollars per share) | $ 0.85 | $ 0.91 | $ 0.90 | $ 0.83 | $ 0.80 | $ 0.86 | $ 0.91 | $ 0.79 | $ 3.49 |  | $ 3.35 |  | $ 2.19 |
Diluted (in dollars per share) | $ 0.84 | $ 0.91 | $ 0.90 | $ 0.83 | $ 0.80 | $ 0.85 | $ 0.90 | $ 0.78 | $ 3.48 |  | $ 3.33 |  | $ 2.17 |
[1] | There were no adjustments to the Company's financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted consolidated prior period amounts to conform to the periods presentation.

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