| 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 | 693.7 | 785.2 | 998.1 | 977.0 | | 659.5 | 615.6 | 598.6 |
| |
| Interest and dividends on investment securities | | | | | | | | |
| Taxable | 37.9 | 59.8 | 100.3 | 119.7 | 96.9 | 95.2 | 100.3 | 102.5 |
| Tax-exempt | 58.7 | 58.3 | 57.6 | 44.8 | 33.0 | 32.0 | 31.2 | 29.1 |
| Other interest | 7.8 | 9.5 | 16.6 | 12.6 | 7.7 | 4.8 | 6.6 | 6.6 |
| Total interest income | 798.2 | 912.8 | 1,172.6 | 1,154.1 | 886.6 | 791.6 | 753.7 | 736.7 |
| |
| Interest expense | | | | | | | | |
| Interest on deposits | 18.6 | 67.6 | 237.3 | 176.1 | 94.0 | 50.3 | 33.1 | 26.3 |
| Interest on federal funds purchased and securities sold under agreements to repurchase | 0.1 | 0.5 | 1.6 | 2.0 | 2.5 | 1.3 | 0.9 | 1.2 |
| Interest on other short-term funding | 0.0 | 0.1 | 0.1 | 0.2 | 0.3 | 0.2 | 0.5 | 0.8 |
| Interest on FHLB advances | 36.5 | 57.4 | 69.8 | 73.7 | 30.4 | 10.7 | | |
| Interest on long-term funding | 17.1 | 22.4 | 28.1 | 22.6 | 18.2 | 21.7 | 42.9 | 27.5 |
| Total interest expense | 72.3 | 149.9 | 336.9 | 274.6 | 145.4 | 84.3 | 77.4 | 55.8 |
| Net interest income | 725.9 | 763.0 | 835.7 | 879.6 | 741.2 | 707.3 | 676.3 | 681.0 |
| Provision for credit losses | -88.0 | 174.0 | 16.0 | | 26.0 | 70.0 | 37.5 | 16.0 |
| Net interest income after provision for credit losses | 813.9 | 589.0 | 819.7 | 879.6 | 715.2 | 637.3 | 638.8 | 665.0 |
| |
| Noninterest income | | | | | | | | |
| Noninterest Income In Scope of Topic 606 | | | | | | | | |
| Card-based fees | | | | | | | | |
| Mortgage banking, net | 50.8 | 45.6 | 31.9 | 19.9 | 19.4 | 38.1 | 32.3 | 21.3 |
| Bank and corporate owned life insurance | | | | | | | | 13.6 |
| Other | 11.0 | 10.2 | 11.2 | 9.1 | 9.5 | 8.5 | 9.1 | 7.0 |
| Noninterest Income, Total | 332.4 | 514.1 | 380.8 | 355.6 | 332.7 | 352.9 | 329.4 | 290.9 |
| |
| Noninterest expense | | | | | | | | |
| Personnel | 426.7 | 432.2 | 487.1 | 482.7 | 429.0 | 424.7 | 404.7 | 390.4 |
| Technology | 81.7 | 81.2 | 82.4 | 72.7 | 63.0 | 57.3 | 60.6 | 55.5 |
| Occupancy | 63.5 | 64.1 | 62.4 | 59.1 | 53.8 | 56.1 | 60.9 | 57.7 |
| Business development and advertising | 21.1 | 18.4 | 29.6 | 30.9 | 28.9 | 26.4 | 25.8 | 26.1 |
| Equipment | 21.1 | 21.7 | 23.6 | 23.2 | 21.2 | 21.5 | 23.2 | 24.8 |
| Legal and professional | 21.9 | 21.5 | 19.9 | 23.1 | 22.5 | 19.9 | 17.1 | 17.5 |
| FDIC assessment | 18.2 | 20.4 | 16.3 | 30.0 | 31.3 | 34.8 | 26.0 | 23.8 |
| Other intangible amortization | 8.8 | 10.2 | 9.9 | 8.2 | 2.0 | 2.1 | 3.1 | 3.7 |
| Other | 38.7 | 49.1 | 54.0 | 55.5 | 50.1 | 41.5 | 57.4 | 59.2 |
| Total noninterest expense | 709.9 | 776.0 | 794.0 | 821.8 | 709.1 | 702.6 | 698.3 | 679.8 |
| Income before income taxes | 436.3 | 327.0 | 406.5 | 413.3 | 338.8 | 287.6 | 269.8 | 276.0 |
| Income tax expense | 85.3 | 20.2 | 79.7 | 79.8 | 109.5 | 87.3 | 81.5 | 85.5 |
| Tax rate | 19.6% | 6.2% | 19.6% | 19.3% | 32.3% | 30.4% | 30.2% | 31.0% |
| Net income | 351.0 | 306.8 | 326.8 | 333.6 | 229.3 | 200.3 | 188.3 | 190.5 |
| Preferred stock dividends | 17.1 | 18.4 | 15.2 | 10.8 | 9.3 | 8.9 | 7.2 | 5.0 |
| Net income available to common equity | 333.9 | 288.4 | 311.6 | 322.8 | 219.9 | 191.4 | 181.1 | 185.5 |
| |
| Earnings per common share | | | | | | | | |
| Basic | $2.20 | $1.87 | $1.93 | $1.92 | $1.45 | $1.27 | $1.20 | $1.17 |
| Diluted | $2.18 | $1.86 | $1.91 | $1.89 | $1.42 | $1.26 | $1.19 | $1.16 |
| |
| Average common shares outstanding | | | | | | | | |
| Basic | 150.8 | 153.0 | 160.5 | 167.3 | 150.9 | 148.8 | 149.4 | 157.3 |
| Diluted | 152.0 | 153.6 | 161.9 | 169.7 | 153.6 | 150.0 | 150.6 | 158.3 |