| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Interest income | | | | | | | | |
| Interest and fees on loans | 983.8 | 820.5 | 993.7 | 1,273.5 | 1,125.0 | 846.3 | 684.6 | 594.7 |
| Investment securities | 63.2 | 42.8 | 17.5 | 8.7 | 2.8 | 1.1 | 1.0 | 1.3 |
| Interest bearing cash and cash equivalents | 97.3 | 13.2 | 28.3 | | | | | |
| Total interest income | 1,144.2 | 876.6 | 1,039.4 | 1,354.8 | 1,164.2 | 879.3 | 703.4 | 603.0 |
| |
| Interest expense | | | | | | | | |
| Deposits | 190.7 | 65.5 | 146.1 | 293.5 | 185.1 | 79.9 | 37.2 | 24.6 |
| Short-term borrowings | 29.1 | 4.6 | 22.0 | 58.4 | 36.2 | 15.1 | 6.1 | 2.3 |
| Long-term debt | 48.7 | 37.6 | 20.0 | 21.8 | 16.8 | 16.8 | 16.8 | 16.8 |
| Total interest expense | 268.5 | 107.7 | 188.1 | 385.6 | 249.3 | 118.0 | 63.6 | 46.4 |
| Net interest income | 875.8 | 768.8 | 851.3 | 969.2 | 914.9 | 761.3 | 639.8 | 556.5 |
| Provision/(benefit) for credit losses | 66.0 | -30.0 | 258.0 | 75.0 | 87.0 | 44.0 | 77.0 | 53.3 |
| Net interest income after provision for credit losses | 809.8 | 798.8 | 593.3 | 894.2 | 827.9 | 717.3 | 562.8 | 503.3 |
| |
| Non-interest income | | | | | | | | |
| Service charges on deposit accounts | 22.9 | 18.7 | 11.6 | 11.3 | 12.8 | 12.4 | 10.3 | 8.3 |
| Wealth management and trust fee income | 15.0 | 13.2 | 10.0 | 8.8 | 8.1 | | | |
| Brokered loan fees | 14.2 | 28.0 | 46.4 | 29.7 | 22.5 | | | |
| Servicing income | 0.9 | 15.5 | 27.0 | 13.4 | 18.3 | | | |
| Investment banking and trading income | 35.1 | 24.4 | 22.7 | 14.9 | | | | |
| Net gain/(loss) on sale of loans held for sale | -1.0 | 1.3 | 58.0 | -20.3 | -15.9 | -2.4 | 2.5 | |
| Other | 14.0 | 37.2 | 27.2 | 44.4 | 26.6 | 15.1 | 13.7 | 9.5 |
| Total non-interest income | 349.5 | 138.2 | 203.0 | 102.4 | 78.0 | 74.3 | 60.8 | 47.7 |
| |
| Non-interest expense | | | | | | | | |
| Salaries and benefits | 436.8 | 350.9 | 340.5 | 328.5 | 300.9 | 264.2 | 229.0 | 192.6 |
| Occupancy expense | 44.2 | 33.2 | 35.0 | 33.0 | 30.3 | 25.8 | 23.2 | 23.2 |
| Marketing | 32.4 | 10.0 | 23.6 | 53.4 | 39.3 | 26.8 | 17.3 | 16.5 |
| Legal and professional | 75.9 | 41.2 | 52.1 | 52.5 | 43.0 | 29.7 | 23.3 | 22.2 |
| Communications and technology | 69.3 | 75.2 | 103.1 | 44.8 | 30.1 | 31.0 | 25.6 | 21.4 |
| Federal Deposit Insurance Corporation insurance assessment | 14.3 | 21.0 | 26.0 | 20.1 | 24.3 | 23.5 | 24.4 | 17.2 |
| Servicing-related expenses | | 27.8 | 64.6 | 22.0 | 14.9 | 15.5 | 1.7 | 0.0 |
| Merger-related expenses | | | 17.8 | 1.4 | | | | |
| Other | 54.7 | 39.7 | 41.8 | 44.7 | 49.7 | 42.9 | 37.0 | 33.4 |
| Total non-interest expense | 727.5 | 599.0 | 704.4 | 600.3 | 532.5 | 465.9 | 382.4 | 326.5 |
| Income before income taxes | 431.8 | 338.1 | 91.9 | 396.3 | 373.4 | 325.7 | 241.2 | 224.5 |
| Income tax expense | -98.7 | -16.9 | 1.8 | 84.3 | 80.0 | 128.6 | 86.1 | 79.6 |
| Net income | 332.5 | 253.9 | 66.3 | 312.0 | 293.4 | 197.1 | 155.1 | 144.9 |
| Preferred stock dividends | -17.3 | -18.7 | -9.8 | -9.8 | -9.8 | -9.8 | -9.8 | -9.8 |
| Net income available to common stockholders | 315.2 | 235.2 | 56.5 | 302.3 | 283.6 | 187.3 | 145.4 | 135.1 |
| |
| Other comprehensive income/(loss): | | | | | | | | |
| Change in unrealized gain/(loss) | -479.8 | -80.4 | 8.6 | | | | | |
| Amounts reclassified into net income | 9.9 | | | | | | | |
| |
| Other comprehensive income/(loss) | | | | | | | | |
| Income tax expense/(benefit) | -98.7 | -16.9 | 1.8 | 84.3 | 80.0 | 128.6 | 86.1 | 79.6 |
| |
| Other comprehensive income/(loss), net of tax | | | | | | | | |
| Comprehensive income/(loss) | -38.8 | 190.5 | 73.1 | 320.4 | 293.4 | 197.1 | 154.8 | 144.3 |
| |
| Basic earnings per common share | | | | | | | | |
| Basic earnings per common share | $6.25 | $4.65 | $1.12 | $6.01 | $5.68 | $3.78 | $3.14 | $2.95 |
| |
| Diluted earnings per common share | | | | | | | | |
| Diluted earnings per common share | $6.18 | $4.60 | $1.12 | $5.99 | $5.64 | $3.73 | $3.11 | $2.91 |