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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Interest income: |  |  |  |
Loans | $ 359,610 | $ 268,341 | $ 1,021,106 | $ 765,246
Investments | 1,928 | 2,193 | 6,272 | 7,155
Cash and cash equivalents | 4,686 | 2,003 | 10,429 | 4,832
Total interest income | 366,224 | 272,537 | 1,037,807 | 777,233
Interest expense: |  |  |  |
Deposits | 61,890 | 38,210 | 157,473 | 107,633
Interest expense on short-term borrowings | 1,804 | 1,604 | 4,234 | 5,827
Interest expense on long-term borrowings | 20,469 | 9,448 | 56,070 | 17,869
Total interest expense | 84,163 | 49,262 | 217,777 | 131,329
Net interest income | 282,061 | 223,275 | 820,030 | 645,904
Less: provisions for credit losses | 54,930 | 41,784 | 130,441 | 116,179
Net interest income after provisions for credit losses | 227,131 | 181,491 | 689,589 | 529,725
Non-interest income: |  |  |  |
Gains (losses) on derivatives and hedging activities, net | 1,661 | 1,368 | (7,326) | 3,156
Other income | 4,455 | 21,598 | 26,430 | 56,309
Total non-interest income | 6,116 | 22,966 | 19,104 | 59,465
Non-interest expenses: |  |  |  |
Compensation and benefits | 51,052 | 43,380 | 157,523 | 138,659
FDIC assessment fees | 7,626 | 5,095 | 21,477 | 13,548
Other operating expenses | 57,464 | 51,234 | 151,070 | 135,164
Total operating expenses | 116,142 | 99,709 | 330,070 | 287,371
Acquired intangible asset amortization expense | 117 | 226 | 351 | 747
Total non-interest expenses | 116,259 | 99,935 | 330,421 | 288,118
Income before income tax expense | 116,988 | 104,522 | 378,272 | 301,072
Income tax expense | 40,617 | 47,557 | 136,341 | 120,987
Net income | 76,371 | 56,965 | 241,931 | 180,085
Preferred stock dividends | 3,028 | 5,316 | 12,577 | 15,698
Net income attributable to SLM Corporation common stock | $ 73,343 | $ 51,649 | $ 229,354 | $ 164,387
Basic earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.17 | $ 0.12 | $ 0.53 | $ 0.38
Average common shares outstanding (in shares) | 431,718 | 428,077 | 430,958 | 427,711
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.17 | $ 0.12 | $ 0.52 | $ 0.38
Average common and common equivalent shares outstanding (in shares) | 438,419 | 433,523 | 438,422 | 432,079

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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Period Type: | duration