| 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 and fees on loans | 353.0 | 293.5 | 296.6 | 255.5 | 201.5 | 168.8 | 148.0 | 125.5 |
| |
| Interest and dividends on investment securities: | | | | | | | | |
| Taxable | 12.7 | 4.4 | 6.5 | 9.1 | 8.5 | 6.8 | 7.3 | 10.7 |
| Tax-exempt | 3.9 | 2.4 | 2.8 | 3.9 | 3.3 | 3.6 | 3.8 | 3.6 |
| Dividends | 1.7 | 1.0 | 1.6 | 1.8 | 2.0 | 1.4 | 1.4 | 1.1 |
| Interest on federal funds sold and other short-term investments | 2.5 | 0.4 | 0.7 | 1.2 | 0.8 | 0.7 | 0.8 | 0.2 |
| Total interest income | 373.7 | 301.7 | 308.2 | 271.5 | 216.1 | 181.3 | 161.2 | 141.0 |
| |
| Interest expense | | | | | | | | |
| Deposits | 50.6 | 24.8 | 52.4 | 65.6 | 39.9 | 23.7 | 18.7 | 13.8 |
| Borrowings | 21.1 | 14.1 | 17.8 | 19.6 | 19.0 | 12.6 | 12.4 | 10.1 |
| Total interest expense | 71.6 | 38.9 | 70.2 | 85.2 | 58.9 | 36.3 | 31.1 | 23.8 |
| Net interest income | 302.1 | 262.9 | 238.0 | 186.3 | 157.2 | 145.1 | 130.1 | 117.2 |
| Provision for credit losses | 17.8 | -5.5 | 41.0 | | 21.1 | 6.0 | 38.7 | 12.6 |
| Net interest income after provision for credit losses | 284.4 | 268.4 | 197.0 | 178.2 | 136.1 | 139.1 | 91.4 | 104.5 |
| |
| Noninterest income | | | | | | | | |
| Deposit, loan and other income | 7.5 | 6.6 | 7.1 | 4.0 | 2.6 | 2.7 | 2.7 | 2.7 |
| Income on bank owned life insurance | 5.6 | 4.8 | 5.0 | 3.5 | 3.1 | 3.2 | 2.6 | 1.8 |
| Net gains on sale of loans held-for-sale | 1.7 | 3.8 | 2.1 | 0.5 | 0.1 | 0.7 | 0.2 | 0.3 |
| Total noninterest income | 13.2 | 15.7 | 14.4 | 8.0 | 5.5 | 8.2 | 9.9 | 11.2 |
| |
| Noninterest expenses | | | | | | | | |
| Salaries and employee benefits | 81.3 | 64.3 | 58.9 | 49.0 | 39.6 | 34.9 | 30.7 | 27.7 |
| Occupancy and equipment | 9.9 | 11.6 | 13.9 | 9.7 | 8.3 | 8.2 | 8.6 | 7.6 |
| FDIC insurance | 2.9 | 2.7 | 4.0 | 2.0 | 3.1 | 3.5 | 2.9 | 2.1 |
| Professional and consulting | 8.1 | 8.3 | 7.4 | 5.5 | 3.6 | 2.9 | 3.0 | 3.0 |
| Marketing and advertising | 1.7 | 1.3 | 1.2 | 1.4 | 1.0 | 1.0 | 1.0 | 0.8 |
| Increase in value of acquisition price | 1.5 | | 2.3 | | | | | |
| Other expenses | 8.9 | 7.8 | 10.2 | 8.6 | 8.5 | 7.3 | 7.0 | 6.3 |
| Total noninterest expenses | 126.4 | 109.0 | 121.0 | 92.2 | 70.5 | 78.8 | 58.5 | 54.5 |
| Income tax expense | 46.0 | 44.7 | 19.1 | 20.6 | 10.8 | 25.3 | 11.8 | 19.9 |
| Net income | 125.2 | 130.4 | 71.3 | 73.4 | 60.4 | 43.2 | 31.1 | 41.3 |
| Preferred dividends | 6.0 | 1.7 | | | | | 0.0 | 0.1 |
| Net income available to common stockholders | 119.2 | 128.6 | 71.3 | 73.4 | | | 31.1 | 41.2 |
| |
| Earnings per common share | | | | | | | | |
| Basic (in dollars per share) | $3.03 | $3.24 | $1.80 | $2.08 | $1.87 | $1.35 | $1.02 | $1.37 |
| Diluted (in dollars per share) | $3.01 | $3.22 | $1.79 | $2.07 | $1.86 | $1.34 | $1.01 | $1.36 |