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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.