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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest income: |  |  |
Loans | $ 1,989,004 | $ 2,249,169 | $ 1,894,687
Investments | 11,743 | 7,607 | 6,162
Cash and cash equivalents | 20,913 | 74,256 | 34,503
Total interest income | 2,021,660 | 2,331,032 | 1,935,352
Interest expense: |  |  |
Deposits | 393,194 | 547,746 | 389,349
Interest expense on short-term borrowings | 14,459 | 6,193 | 5,833
Interest expense on long-term borrowings | 134,014 | 153,778 | 127,106
Total interest expense | 541,667 | 707,717 | 522,288
Net interest income | 1,479,993 | 1,623,315 | 1,413,064
Less: provisions for credit losses | 93,133 | 354,249 | 244,864
Net interest income after provisions for credit losses | 1,386,860 | 1,269,066 | 1,168,200
Non-interest income (loss): |  |  |
Gains on sales of loans, net | 238,315 | 0 | 2,060
Losses on sales of securities, net | 0 | 0 | (1,549)
Gains (losses) on derivatives and hedging activities, net | 49,544 | 17,825 | (87)
Other income (loss) | 43,590 | 31,102 | (52,319)
Total non-interest income (loss) | 331,449 | 48,927 | (51,895)
Operating expenses |  |  |
Compensation and benefits | 282,497 | 278,229 | 252,346
FDIC assessment fees | 21,956 | 32,852 | 32,786
Other operating expenses | 233,635 | 263,172 | 271,844
Total operating expenses | 538,088 | 574,253 | 556,976
Restructuring expenses | 26,215 | 0 | 0
Total non-interest expenses | 564,303 | 574,253 | 556,976
Income before income tax expense | 1,154,006 | 743,740 | 559,329
Income tax expense | 273,316 | 165,464 | 71,853
Net income | 880,690 | 578,276 | 487,476
Preferred stock dividends | 9,734 | 16,837 | 15,640
Net income attributable to SLM Corporation common stock | $ 870,956 | $ 561,439 | $ 471,836
Basic earnings per common share attributable to SLM Corporation (in usd per share) | $ 2.27 | $ 1.31 | $ 1.08
Average common shares outstanding (in shares) | 383,705 | 427,292 | 435,054
Diluted earnings per common share attributable to SLM Corporation (in usd per share) | $ 2.25 | $ 1.30 | $ 1.07
Average common and common equivalent shares outstanding (in shares) | 387,195 | 430,674 | 439,681
Declared dividends per common share attributable to SLM Corporation (in usd per share) | $ 0.12 | $ 0.12 | $ 0

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