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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Interest income: |  |
Loans | $ 430,048 | $ 324,757
Investments | 1,947 | 2,143
Cash and cash equivalents | 5,236 | 2,588
Total interest income | 437,231 | 329,488
Interest expense: |  |
Deposits | 77,456 | 44,853
Interest expense on short-term borrowings | 2,393 | 1,236
Interest expense on long-term borrowings | 24,768 | 15,323
Total interest expense | 104,617 | 61,412
Net interest income | 332,614 | 268,076
Less: provisions for credit losses | 53,931 | 25,296
Net interest income after provisions for credit losses | 278,683 | 242,780
Non-interest income: |  |
Gains (losses) on derivatives and hedging activities, net | 3,892 | (5,378)
Other income | 9,642 | 11,346
Total non-interest income | 13,534 | 5,968
Non-interest expenses: |  |
Compensation and benefits | 68,317 | 55,464
FDIC assessment fees | 8,796 | 7,229
Other operating expenses | 47,761 | 39,984
Total operating expenses | 124,874 | 102,677
Acquired intangible asset amortization expense | 92 | 117
Total non-interest expenses | 124,966 | 102,794
Income before income tax expense | 167,251 | 145,954
Income tax expense | 40,997 | 51,011
Net income | 126,254 | 94,943
Preferred stock dividends | 3,397 | 5,575
Net income attributable to SLM Corporation common stock | $ 122,857 | $ 89,368
Basic earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.28 | $ 0.21
Average common shares outstanding (in shares) | 433,952 | 429,891
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.28 | $ 0.20
Average common and common equivalent shares outstanding (in shares) | 438,977 | 438,735

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