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Selected Quarterly Financial Information (unaudited) (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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 366,537 | $ 364,567 | $ 348,775 | $ 400,116 | $ 419,101 | $ 405,065 | $ 396,868 | $ 402,281 | $ 1,479,993 | $ 1,623,315 | $ 1,413,064
Less: provisions for credit losses | (316,372) | (3,640) | 351,887 | 61,258 | 97,558 | 99,526 | 93,375 | 63,790 | 93,133 | 354,249 | 244,864
Net interest income after provisions for credit losses | 682,909 | 368,207 | (3,112) | 338,858 | 321,543 | 305,539 | 303,493 | 338,491 | 1,386,860 | 1,269,066 | 1,168,200
Gains on sales of loans, net | (247) | (4) | (369) | 238,935 |  |  |  |  | 238,315 | 0 | 2,060
Gains (losses) on derivative and hedging activities, net | 136 | (15) | 3,751 | 45,672 | (3,635) | 1,961 | 16,736 | 2,763 |  |  |
Other income | 1,043 | 9,646 | 25,412 | 7,487 | (211) | 15,280 | 2,655 | 13,378 | 43,590 | 31,102 | (52,319)
Total operating expenses | 121,743 | 127,490 | 141,557 | 147,298 | 141,679 | 153,621 | 138,806 | 140,147 | 538,088 | 574,253 | 556,976
Restructuring expenses | 2,088 | 24,127 | 0 | 0 |  |  |  |  | 26,215 | 0 | 0
Income tax benefit | 127,310 | 55,189 | (30,664) | 121,481 | 34,666 | 40,701 | 33,801 | 56,296 | 273,316 | 165,464 | 71,853
Net income (loss) | 432,700 | 171,028 | (85,211) | 362,173 | 141,352 | 128,458 | 150,277 | 158,189 | 880,690 | 578,276 | 487,476
Preferred stock dividends | 1,734 | 2,058 | 2,478 | 3,464 | 3,885 | 4,153 | 4,331 | 4,468 | 9,734 | 16,837 | 15,640
Net income attributable to SLM Corporation common stock | $ 430,966 | $ 168,970 | $ (87,689) | $ 358,709 | $ 137,467 | $ 124,305 | $ 145,946 | $ 153,721 | $ 870,956 | $ 561,439 | $ 471,836
Basic earnings per common share attributable to SLM Corporation (in usd per share) | $ 1.15 | $ 0.45 | $ (0.23) | $ 0.88 | $ 0.33 | $ 0.29 | $ 0.34 | $ 0.35 | $ 2.27 | $ 1.31 | $ 1.08
Diluted earnings per common share attributable to SLM Corporation (in usd per share) | 1.13 | 0.45 | (0.23) | 0.87 | 0.32 | 0.29 | 0.34 | 0.35 | 2.25 | 1.30 | 1.07
Declared dividends per common share attributable to SLM Corporation (in usd per share) | $ 0.03 | $ 0 | $ 0.06 | $ 0.03 | $ 0.03 | $ 0 | $ 0.06 | $ 0.03 | $ 0.12 | $ 0.12 | $ 0

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