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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest income: |  |  |
Loans | $ 2,249,169 | $ 1,894,687 | $ 1,413,505
Investments | 7,607 | 6,162 | 8,288
Cash and cash equivalents | 74,256 | 34,503 | 15,510
Total interest income | 2,331,032 | 1,935,352 | 1,437,303
Interest expense: |  |  |
Deposits | 547,746 | 389,349 | 223,691
Interest expense on short-term borrowings | 6,193 | 5,833 | 6,341
Interest expense on long-term borrowings | 153,778 | 127,106 | 78,050
Total interest expense | 707,717 | 522,288 | 308,082
Net interest income | 1,623,315 | 1,413,064 | 1,129,221
Less: provisions for credit losses | 354,249 | 244,864 | 185,765
Net interest income after provisions for credit losses | 1,269,066 | 1,168,200 | 943,456
Non-interest income (loss): |  |  |
Gains on sales of loans, net | 0 | 2,060 | 0
Losses on sales of securities, net | 0 | (1,549) | 0
Gains (losses) on derivatives and hedging activities, net | 17,825 | (87) | (8,266)
Other income (loss) | 31,102 | (52,319) | 5,364
Total non-interest income (loss) | 48,927 | (51,895) | (2,902)
Non-interest expenses: |  |  |
Compensation and benefits | 278,229 | 252,346 | 213,319
FDIC assessment fees | 32,852 | 32,786 | 28,950
Other operating expenses | 263,172 | 271,844 | 206,820
Total non-interest expenses | 574,253 | 556,976 | 449,089
Income before income tax expense | 743,740 | 559,329 | 491,465
Income tax expense | 165,464 | 71,853 | 202,531
Net income | 578,276 | 487,476 | 288,934
Preferred stock dividends | 16,837 | 15,640 | 15,714
Net income attributable to SLM Corporation common stock | $ 561,439 | $ 471,836 | $ 273,220
Basic earnings per common share attributable to SLM Corporation (in usd per share) | $ 1.31 | $ 1.08 | $ 0.63
Average common shares outstanding (in shares) | 427,292 | 435,054 | 431,216
Diluted earnings per common share attributable to SLM Corporation (in usd per share) | $ 1.30 | $ 1.07 | $ 0.62
Average common and common equivalent shares outstanding (in shares) | 430,674 | 439,681 | 438,551
Declared dividends per common share attributable to SLM Corporation (in usd per share) | $ 0.12 | $ 0 | $ 0

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