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v3.20.4

Interim Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 173,249 | $ 160,086 | $ 161,974 | $ 167,999 | $ 176,553 | $ 185,853 | $ 189,063 | $ 178,918 | $ 663,308 |  | $ 730,387 |  | $ 632,045 |
Interest expense | 12,170 | 14,513 | 16,303 | 24,228 | 27,654 | 32,757 | 33,833 | 31,870 | 67,214 |  | 126,114 |  | 94,443 |
Net interest income | 161,079 | 145,573 | 145,671 | 143,771 | 148,899 | 153,096 | 155,230 | 147,048 | 596,094 |  | 604,273 |  | 537,602 |
Provision for loan losses | (1,100) | 0 | 22,545 | 16,950 | 1,264 | 1,437 | 1,003 | 1,043 | 38,395 | [1] | 4,747 | [1] | 6,966 | [1]
Noninterest income | 58,552 | 64,759 | 58,461 | 57,502 | 47,726 | 53,961 | 51,214 | 46,416 | 239,274 |  | 199,317 |  | 195,305 |
Noninterest expense | 142,318 | 120,234 | 120,121 | 158,744 | 134,743 | 122,585 | 128,118 | 123,041 | 541,417 |  | 508,487 |  | 517,261 |
Income before income taxes | 78,413 | 90,098 | 61,466 | 25,579 | 60,618 | 83,035 | 77,323 | 69,380 | 255,556 |  | 290,356 |  | 208,680 |
Income tax expense | 4,293 | 12,154 | 9,761 | 2,939 | 11,433 | 13,254 | 14,359 | 13,104 | 29,147 |  | 52,150 |  | 17,850 |
Net income | $ 74,120 | $ 77,944 | $ 51,705 | $ 22,640 | $ 49,185 | $ 69,781 | $ 62,964 | $ 56,276 | $ 226,409 |  | $ 238,206 |  | $ 190,830 |
Net income per common share - basic (in dollars per share) | $ 0.45 | $ 0.47 | $ 0.32 | $ 0.13 | $ 0.29 | $ 0.41 | $ 0.37 | $ 0.32 | $ 1.37 |  | $ 1.39 |  | $ 1.23 |
Net income per common share - diluted (in dollars per share) | $ 0.44 | $ 0.47 | $ 0.32 | $ 0.13 | $ 0.29 | $ 0.41 | $ 0.36 | $ 0.32 | $ 1.36 |  | $ 1.38 |  | $ 1.22 |
Weighted average number of common shares outstanding - basic (in shares) | 164,799 | 164,773 | 164,732 | 167,748 | 169,235 | 170,746 | 172,985 | 174,734 | 165,509 |  | 171,907 |  | 155,675 |
Weighted average number of common shares outstanding - diluted (in shares) | 165,631 | 165,419 | 165,302 | 168,404 | 170,186 | 171,551 | 173,675 | 175,368 | 166,177 |  | 172,687 |  | 156,539 |
ONB Way Strategic Initiative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  | $ 31,200 |  |  |  |  |  |  |  |  |  |
[1] | Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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