| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| INTEREST INCOME | | | | | | | | |
| Interest and fees on loans and leases | 890.5 | 951.4 | 1,051.1 | 972.1 | 871.3 | 843.6 | 869.4 | 763.8 |
| |
| Interest and dividends on investment securities: | | | | | | | | |
| Taxable | 60.4 | 47.7 | 56.2 | 76.0 | 58.0 | 46.4 | 47.8 | 45.8 |
| Exempt from federal income tax | 5.9 | 6.1 | 7.4 | 8.4 | 8.7 | 8.8 | 9.6 | 10.3 |
| Dividends | 1.3 | 2.6 | 2.3 | 2.0 | 1.5 | 1.4 | 0.7 | 0.3 |
| Interest on temporary investments and interest bearing deposits | 3.9 | 4.7 | 14.2 | 8.7 | 4.4 | 3.9 | 2.2 | 2.3 |
| Total interest income | 962.0 | 1,012.6 | 1,131.1 | 1,067.1 | 943.9 | 904.2 | 929.9 | 822.5 |
| |
| INTEREST EXPENSE | | | | | | | | |
| Interest on deposits | 27.2 | 100.2 | 167.9 | 92.7 | 45.6 | 35.2 | 29.8 | 23.8 |
| Interest on securities sold under agreement to repurchase and federal funds purchased | 0.3 | 0.8 | 2.1 | 0.5 | 0.5 | 0.1 | 0.2 | |
| Interest on borrowings | 2.8 | 13.9 | 17.6 | 13.6 | 14.2 | 15.0 | 14.5 | |
| Interest on junior subordinated debentures | 12.1 | 15.2 | 22.8 | 21.7 | 18.0 | 15.7 | 13.8 | |
| Total interest expense | 42.4 | 130.1 | 210.4 | 128.5 | 78.2 | 66.1 | 58.2 | 48.7 |
| Net interest income | 919.6 | 882.5 | 920.6 | 938.6 | 865.7 | 838.1 | 871.6 | 773.8 |
| PROVISION (RECAPTURE) FOR CREDIT LOSSES | -42.7 | 204.9 | 72.5 | 55.9 | 47.3 | 41.7 | 36.6 | 40.2 |
| Net interest income after provision (recapture) for credit losses | 962.3 | 677.7 | 848.1 | 882.7 | 818.4 | 796.4 | 835.0 | 733.6 |
| |
| NON-INTEREST INCOME | | | | | | | | |
| Revenue from contract with customer | | | | | | | | |
| Residential mortgage banking revenue, net | 186.8 | 270.8 | 101.8 | 118.2 | 136.3 | 157.9 | 124.7 | 77.3 |
| Gain on loan and lease sales, net | 15.7 | 6.7 | 10.5 | 7.8 | 18.0 | 15.1 | 22.4 | |
| Bank owned life insurance income | 8.3 | 8.4 | 8.4 | 8.3 | 8.2 | 8.5 | 8.4 | |
| Noninterest Income, Other Operating Income | 63.7 | 40.5 | 48.3 | 67.9 | | | 45.4 | 26.5 |
| Total non-interest income | 356.3 | 412.0 | 339.8 | 279.4 | 278.5 | 301.7 | 275.7 | 181.2 |
| |
| NON-INTEREST EXPENSE | | | | | | | | |
| Salaries and employee benefits | 480.8 | 479.2 | 420.4 | 425.6 | 438.2 | 424.8 | 430.9 | 355.4 |
| Occupancy and equipment, net | 137.5 | 151.7 | 144.2 | 148.7 | 150.5 | 151.9 | 143.0 | 111.3 |
| Communications | 11.6 | 11.8 | 14.6 | 17.2 | 18.9 | 21.3 | 20.6 | 14.7 |
| Services | 48.8 | 46.6 | 54.1 | 62.7 | 45.3 | 42.8 | 46.4 | 49.1 |
| FDIC assessments | 9.2 | 12.5 | 11.2 | 16.1 | 15.0 | 15.5 | 13.5 | 11.0 |
| Intangible amortization | 4.5 | 5.0 | 5.6 | 6.2 | 6.8 | 8.6 | 11.2 | 10.2 |
| Merger related expenses | 15.2 | | | | 9.3 | 15.3 | 45.6 | 82.3 |
| Other expenses | 45.4 | 46.0 | 55.6 | 51.6 | 55.5 | 46.1 | 39.1 | 36.5 |
| Total non-interest expense | 760.5 | 2,546.1 | 719.0 | 739.5 | 747.9 | 737.2 | 763.6 | 684.1 |
| Income before provision for income taxes | 558.2 | -1,456.4 | 468.9 | | | 230.1 | 222.5 | 147.7 |
| Provision for income taxes | 137.9 | 67.0 | 114.8 | 106.4 | 106.7 | 130.9 | 124.6 | 83.0 |
| Net income | 420.3 | -1,523.4 | 354.1 | 316.3 | 242.3 | | | |
| |
| Earnings per common share: | | | | | | | | |
| Basic (in dollars per share) | $1.92 | ($6.92) | $1.61 | $1.44 | $1.10 | $1.04 | $1.01 | $0.79 |
| Diluted (in dollars per share) | $1.91 | ($6.92) | $1.60 | $1.43 | $1.10 | $1.04 | $1.01 | $0.78 |
| |
| Weighted average number of common shares outstanding: | | | | | | | | |
| Basic (in shares) | 219.0 | 220.2 | 220.3 | 220.3 | 220.3 | 220.3 | 220.3 | 186.6 |
| Diluted (in shares) | 219.6 | 220.2 | 220.7 | 220.7 | 220.8 | 220.9 | 221.0 | 187.5 |