| 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/A | 10-K | 10-K |
| Interest Income | | | | | | | | |
| Loans and fees | 325.0 | 237.0 | 229.0 | 233.5 | 193.1 | 172.3 | 149.8 | 115.3 |
| Federal funds sold and interest-bearing deposits with banks | 1.3 | 0.4 | 0.3 | 1.7 | 1.6 | 0.9 | 0.6 | 0.1 |
| Taxable investment securities and other | 35.4 | 17.2 | 17.8 | 19.7 | 16.7 | 15.0 | 11.2 | 10.6 |
| Tax-exempt investment securities | 5.9 | 2.6 | 1.6 | 1.5 | 1.7 | 2.0 | 1.8 | 1.6 |
| Total Interest Income | 367.5 | 257.3 | 248.8 | 256.5 | 213.1 | 190.2 | 163.3 | 127.5 |
| |
| Interest Expense | | | | | | | | |
| Deposits | 44.3 | 16.8 | 32.1 | 49.2 | 30.6 | 16.6 | 10.5 | 5.8 |
| Federal funds purchased and securities sold under agreements to repurchase | 3.7 | 0.1 | 0.6 | 1.5 | 0.5 | 0.2 | 0.1 | 0.1 |
| Other borrowings | 7.0 | 5.6 | 8.5 | 9.7 | 8.5 | 8.2 | 7.1 | 5.0 |
| Total Interest Expense | 1,760.5 | 22.5 | 41.2 | 530.5 | 39.6 | 25.0 | 17.6 | 10.9 |
| Net Interest Income | 312.6 | 234.8 | 207.7 | 196.0 | 173.6 | 165.2 | 145.6 | 116.6 |
| Provision for credit losses | 8.5 | -10.9 | 27.2 | 2.1 | 4.4 | 6.1 | 4.2 | 1.9 |
| Net Interest Income after Provision for Credit Losses | 304.1 | 245.7 | 180.5 | 193.9 | 169.1 | 159.1 | 141.4 | 114.7 |
| |
| Noninterest Income | | | | | | | | |
| Service charges on deposit accounts | 20.1 | 16.8 | 15.0 | 17.4 | 16.1 | 15.6 | 10.2 | 10.0 |
| Commissions and fees | 20.1 | 16.8 | 15.0 | 17.4 | 16.1 | 15.6 | 10.2 | 10.0 |
| Income on bank owned life insurance | 4.0 | 2.7 | 2.7 | 2.7 | 3.3 | 2.4 | 2.6 | 2.0 |
| Gains on sales of loans held for sale | 2.8 | 2.3 | 3.3 | 1.7 | 1.3 | 1.8 | 2.1 | 1.7 |
| Swap income | 1.6 | 0.6 | 4.7 | 3.2 | 2.0 | 1.0 | | |
| Other income | 1.0 | 0.3 | 0.7 | 1.2 | 0.2 | 2.1 | 1.8 | 0.8 |
| Total Noninterest Income | 57.5 | 45.0 | 27.1 | 26.8 | 45.2 | 25.4 | 21.3 | 21.2 |
| |
| Noninterest Expense | | | | | | | | |
| Compensation and employee benefits | 108.2 | 82.6 | 76.5 | 75.3 | 68.6 | 61.2 | 56.1 | 48.6 |
| Premises and equipment | 30.9 | 24.8 | 21.9 | 19.7 | | | | |
| FDIC insurance expense | 2.7 | 2.3 | 2.1 | 0.4 | 1.6 | 1.6 | 2.2 | 2.1 |
| Data processing expense | 6.2 | 5.5 | 5.0 | 4.9 | 3.6 | 2.0 | 1.9 | 1.5 |
| Merger-related expenses | | | | | | | 4.1 | 1.2 |
| Other expenses | 31.6 | 23.8 | 27.4 | 23.2 | 10.7 | 10.5 | 10.2 | 9.0 |
| Total Noninterest Expense | 188.2 | 140.8 | 132.8 | 126.8 | 111.2 | 104.5 | 99.9 | 87.2 |
| Income before provision for income taxes | 144.0 | 127.3 | 74.8 | 93.9 | 80.3 | | 62.8 | 48.6 |
| Provision for income taxes | 36.6 | 32.3 | 17.3 | 23.3 | 16.9 | 27.5 | 21.3 | 16.2 |
| Net Income | 107.4 | 95.0 | 57.5 | 70.7 | 63.4 | 52.6 | 41.5 | 32.5 |
| |
| Per Share of Common Stock | | | | | | | | |
| Basic earnings (in usd per share) | $1.64 | $1.85 | $1.13 | $1.39 | $1.32 | $1.10 | $0.96 | $0.85 |
| Diluted earnings (in usd per share) | $1.63 | $1.85 | $1.13 | $1.38 | $1.32 | $1.09 | $0.95 | $0.85 |
| |
| Dividends (in usd per share) | $0.57 | $0.53 | $0.50 | $0.49 | $0.45 | $0.40 | $0.37 | $0.33 |