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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 381,431,000 | $ 369,510,000 | $ 362,808,000 | $ 375,032,000 | $ 367,350,000 | $ 357,518,000 | $ 338,784,000 | $ 331,114,000 | $ 1,488,781,000 | $ 1,394,766,000 | $ 1,479,993,000
Less: provisions for credit losses | 297,260,000 | 207,598,000 | 30,545,000 | 98,050,000 | (15,309,000) | 138,442,000 | 69,677,000 | (225,767,000) | (633,000,000) | (33,000,000) |
Net interest income (loss) after provisions for credit losses | 84,171,000 | 161,912,000 | 332,263,000 | 276,982,000 | 382,659,000 | 219,076,000 | 269,107,000 | 556,881,000 | 855,328,000 | 1,427,723,000 | 1,386,860,000
Gains (losses) on sales of loans, net | 2,894,000 | 74,978,000 | 239,997,000 | 9,881,000 | 145,535,000 | (10,000) | 3,679,000 | 399,111,000 | 327,750,000 | 548,315,000 | 238,315,000
Gains (losses) on securities, net | (58,245,000) | 891,000 | 667,000 | (3,580,000) | 666,000 | 893,000 | 37,534,000 | 3,000 | (60,267,000) | 39,096,000 | 4,372,000
Gains (losses) on derivative and hedging activities, net | 0 | 0 | 0 | (5,000) | (17,000) | 44,000 | 89,000 | 28,000 | (5,000) | 144,000 | 49,544,000
Other income | 14,708,000 | 19,234,000 | 17,589,000 | 15,629,000 | 6,577,000 | 12,986,000 | 11,046,000 | 14,285,000 | 67,160,000 | 44,894,000 | 39,218,000
Total operating expenses | 137,762,000 | 149,964,000 | 131,730,000 | 132,006,000 | 125,495,000 | 140,649,000 | 128,010,000 | 124,499,000 |  |  |
Acquired intangible assets amortization expense | 2,301,000 | 2,328,000 | 2,417,000 | 733,000 |  |  |  |  | 7,779,000 | 0 | 0
Restructuring expenses |  |  |  |  | 0 | 108,000 | 70,000 | 1,077,000 | 0 | 1,255,000 | 26,215,000
Income tax expense (benefit) | (19,492,000) | 29,551,000 | 114,296,000 | 37,356,000 | 103,660,000 | 19,392,000 | 53,174,000 | 203,525,000 | 161,711,000 | 379,751,000 | 273,316,000
Net income | (77,043,000) | 75,172,000 | 342,073,000 | 128,812,000 | 306,265,000 | 72,840,000 | 140,201,000 | 641,207,000 | 469,014,000 | 1,160,513,000 | 880,690,000
Preferred stock dividends | 3,466,000 | 2,531,000 | 1,757,000 | 1,275,000 | 1,177,000 | 1,166,000 | 1,192,000 | 1,201,000 | 9,029,000 | 4,736,000 | 9,734,000
Net income attributable to SLM Corporation common stock | (80,509,000) | 72,641,000 | 340,316,000 | 127,537,000 | 305,088,000 | 71,674,000 | 139,009,000 | 640,006,000 | 459,985,000 | 1,155,777,000 | 870,956,000
Net income attributable to SLM Corporation common stock | $ (80,509,000) | $ 72,641,000 | $ 340,316,000 | $ 127,537,000 | $ 305,088,000 | $ 71,674,000 | $ 139,009,000 | $ 640,006,000 | $ 459,985,000 | $ 1,155,777,000 | $ 870,956,000
Basic earnings per common share (in usd per share) | $ (0.33) | $ 0.29 | $ 1.30 | $ 0.46 | $ 1.06 | $ 0.24 | $ 0.45 | $ 1.77 | $ 1.78 | $ 3.67 | $ 2.27
Diluted earnings per common share (in usd per share) | (0.33) | 0.29 | 1.29 | 0.45 | 1.04 | 0.24 | 0.44 | 1.75 | 1.76 | 3.61 | 2.25
Declared dividends per common share (in usd per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.44 | $ 0.20 | $ 0.12

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