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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
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest income | $ 167,596 | $ 172,234 | $ 174,008 | $ 186,736 | $ 191,226 | $ 197,831 | $ 192,449 | $ 187,761 |  |  |
Interest expense | 27,776 | 34,730 | 39,533 | 46,425 | 50,015 | 50,831 | 49,070 | 44,445 | $ 148,464 | $ 194,361 | $ 122,056
Net interest income | 139,820 | 137,504 | 134,475 | 140,311 | 141,211 | 147,000 | 143,379 | 143,316 | 552,110 | 574,906 | 565,899
(Reversal)/provision for credit losses | (5,000) | 12,500 | 25,000 | 25,000 | (5,000) | (2,000) | 0 | 0 | 57,500 | (7,000) | (4,500)
Net-interest income after reversal for loan losses | 144,820 | 125,004 | 109,475 | 115,311 | 146,211 | 149,000 | 143,379 | 143,316 | 494,610 | 581,906 | 570,399
Non-interest income | 11,451 | 9,977 | 15,606 | 5,786 | 8,648 | 10,388 | 12,794 | 12,921 | 42,820 | 44,751 | 31,707
Non-interest expense | 75,046 | 75,997 | 67,268 | 65,154 | 71,192 | 65,580 | 69,546 | 70,970 | 283,465 | 277,288 | 264,419
Income before income tax expense | 81,225 | 58,984 | 57,813 | 55,943 | 83,667 | 93,808 | 86,627 | 85,267 |  |  |
Income tax benefit | 10,332 | 2,190 | 3,492 | 9,091 | 16,290 | 20,973 | 14,383 | 18,588 | 25,105 | 70,234 | 65,802
Net income | $ 70,893 | $ 56,794 | $ 54,321 | $ 46,852 | $ 67,377 | $ 72,835 | $ 72,244 | $ 66,679 | $ 228,860 | $ 279,135 | $ 271,885
Basic (in dollars per share) | $ 0.89 | $ 0.71 | $ 0.68 | $ 0.59 | $ 0.85 | $ 0.91 | $ 0.90 | $ 0.83 | $ 2.88 | $ 3.49 | $ 3.35
Diluted (in dollars per share) | $ 0.89 | $ 0.71 | $ 0.68 | $ 0.59 | $ 0.84 | $ 0.91 | $ 0.90 | $ 0.83 | $ 2.87 | $ 3.48 | $ 3.33

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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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