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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Interest income: |  |  |  |  |
Loans, including fees |  | $ 401,997 | $ 457,564 | $ 829,334 | $ 905,333
Investment securities available for sale |  | 44,935 | 52,794 | 96,588 | 102,732
Loans held for sale |  | 1,914 | 752 | 2,706 | 1,165
Federal Reserve Bank balances |  | 394 | 2,701 | 1,902 | 6,371
Other earning assets |  | 2,329 | 2,320 | 4,936 | 5,369
Total interest income |  | 451,569 | 516,131 | 935,466 | 1,020,970
Interest expense: |  |  |  |  |
Deposits |  | 56,474 | 92,700 | 142,476 | 180,383
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings |  | 1,778 | 7,294 | 7,710 | 10,757
Long-term debt |  | 16,751 | 18,875 | 35,454 | 35,392
Total interest expense |  | 75,003 | 118,869 | 185,640 | 226,532
Net interest income |  | 376,566 | 397,262 | 749,826 | 794,438
Provision for credit losses | [1] | 141,851 | 12,119 | 300,573 | 35,688
Net interest income after provision for credit losses |  | 234,715 | 385,143 | 449,253 | 758,750
Non-interest revenue: |  |  |  |  |
Service charges on deposit accounts |  | 15,567 | 21,994 | 36,255 | 42,853
Fiduciary and asset management fees |  | 14,950 | 14,478 | 30,124 | 28,057
Card fees |  | 9,186 | 11,161 | 20,136 | 22,037
Brokerage revenue |  | 9,984 | 10,052 | 22,383 | 19,431
Mortgage banking income |  | 23,530 | 7,907 | 35,757 | 12,962
Capital markets income |  | 6,050 | 8,916 | 17,294 | 14,161
Income from bank-owned life insurance |  | 7,756 | 5,176 | 13,794 | 10,466
Investment securities gains (losses), net |  | 69,409 | (1,845) | 78,144 | (1,771)
Other non-interest revenue |  | 17,052 | 11,968 | 23,454 | 20,989
Total non-interest revenue |  | 173,484 | 89,807 | 277,341 | 169,185
Non-interest expense: |  |  |  |  |
Salaries and other personnel expense |  | 159,597 | 143,009 | 309,274 | 282,436
Net occupancy, equipment, and software expense |  | 41,727 | 39,851 | 83,921 | 78,245
Third-party processing and other services |  | 21,366 | 19,118 | 42,846 | 36,875
Professional fees |  | 15,305 | 9,312 | 25,980 | 15,660
FDIC insurance and other regulatory fees |  | 6,851 | 7,867 | 12,129 | 14,629
Merger-related expense |  | 0 | 7,401 | 0 | 57,140
Other operating expenses |  | 39,295 | 37,568 | 86,271 | 71,552
Total non-interest expense |  | 284,141 | 264,126 | 560,421 | 556,537
Income before income taxes |  | 124,058 | 210,824 | 166,173 | 371,398
Income tax expense |  | 30,866 | 54,640 | 34,461 | 95,028
Net income |  | 93,192 | 156,184 | 131,712 | 276,370
Less: Preferred stock dividends |  | 8,291 | 3,150 | 16,581 | 6,300
Net income available to common shareholders |  | $ 84,901 | $ 153,034 | $ 115,131 | $ 270,070
Net income per common share, basic (in dollars per share) |  | $ 0.58 | $ 0.97 | $ 0.78 | $ 1.70
Net income per common share, diluted (in dollars per share) |  | $ 0.57 | $ 0.96 | $ 0.78 | $ 1.68
Weighted average common shares outstanding, basic (in shares) |  | 147,288 | 157,389 | 147,300 | 159,148
Weighted average common shares outstanding, diluted (in shares) |  | 147,733 | 159,077 | 148,067 | 160,908
[1] | Beginning January 1, 2020, provision calculation is based on current expected credit loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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