| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-05-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 8-K |
| Interest income | | | | | | | | |
| Loans | 93.5 | 84.2 | 87.5 | 75.1 | 50.6 | | 40.6 | |
| Investment securities - taxable | 10.2 | 6.6 | 10.5 | 14.5 | 10.9 | | 7.5 | |
| Investment securities - tax-exempt | 4.1 | 2.5 | 1.6 | 2.1 | 3.9 | | 3.1 | |
| Total interest income | 108.7 | 93.7 | 99.6 | 93.0 | 65.7 | 65.7 | 51.5 | 40.2 |
| |
| Interest expense | | | | | | | | |
| Deposits | 6.3 | 4.2 | 12.0 | 19.3 | 10.2 | | 6.1 | 6.1 |
| Securities sold under agreements to repurchase and federal funds purchased | 0.0 | 0.0 | 0.1 | 0.6 | 0.1 | | 0.8 | |
| FHLB advances and other borrowings | | | | | | 1.6 | | |
| Subordinated notes | 2.0 | 2.0 | 2.0 | 2.0 | 0.1 | | | |
| Total interest expense | 9.0 | 6.7 | 16.0 | 23.7 | 13.5 | 13.5 | 7.6 | 6.1 |
| Net interest income | 99.6 | 87.0 | 83.6 | 69.3 | 52.2 | 52.2 | 43.8 | 43.4 |
| Net interest income after provision for credit losses | 95.5 | 85.9 | 78.3 | 68.4 | 51.4 | 51.4 | 42.8 | |
| |
| Noninterest income | | | | | | | | |
| Service charges on deposit accounts | 3.8 | 3.0 | 2.9 | 3.4 | 3.2 | 4.1 | 3.1 | 5.7 |
| Interchange income | 4.1 | 4.1 | 3.4 | 3.3 | 2.8 | | 2.6 | |
| Swap fee income | 2.6 | 0.3 | 0.8 | 1.2 | | | | |
| Trust and investment management income | 7.6 | 7.9 | 6.9 | 7.3 | 6.6 | | 6.4 | |
| Brokerage income | 3.6 | 3.6 | 2.8 | 2.4 | 2.0 | | 1.9 | |
| Mortgage banking activities | 0.4 | 5.9 | 5.3 | 3.0 | 2.7 | 2.7 | 2.9 | 2.9 |
| Income from life insurance | 2.3 | 2.3 | 2.3 | 2.0 | 1.5 | | 1.1 | |
| Other income | 1.8 | 0.8 | 0.4 | 0.3 | 0.3 | 1.8 | 0.2 | |
| Total noninterest income | 27.0 | 29.2 | 28.3 | 28.5 | 21.0 | 21.0 | 19.9 | 5.7 |
| |
| Noninterest expenses | | | | | | | | |
| Salaries and employee benefits | 48.0 | 44.0 | 43.4 | 39.5 | 32.5 | | 30.1 | |
| Occupancy | 4.7 | 4.7 | 4.8 | 4.3 | 3.1 | | 2.8 | |
| Furniture and equipment | 5.1 | 5.1 | 4.8 | 4.7 | 4.1 | | 3.4 | |
| Data processing | 4.6 | 4.1 | 3.6 | 3.6 | 2.7 | | 2.3 | |
| Advertising and bank promotions | 2.3 | 2.2 | 1.7 | 2.0 | 1.6 | | 1.6 | |
| FDIC insurance | 1.1 | 0.8 | 0.7 | 0.4 | 0.7 | | 0.6 | |
| Professional services | 3.3 | 2.6 | 3.1 | 3.0 | 1.8 | | 1.6 | |
| Directors' compensation | 0.9 | 0.9 | 0.9 | 1.0 | 1.0 | | 1.0 | |
| Taxes other than income | 1.4 | 1.3 | 1.1 | 1.0 | 1.0 | | 0.9 | |
| Intangible asset amortization | 1.1 | 1.3 | 1.6 | 1.6 | 0.3 | 0.3 | 0.1 | 0.1 |
| Other operating expenses | 6.0 | 6.0 | 6.7 | 5.7 | 5.2 | | 4.4 | |
| Total noninterest expenses | 95.8 | 74.1 | 74.1 | 77.3 | 57.9 | 57.9 | 50.3 | |
| Income before income tax expense | 26.6 | 40.9 | 32.5 | 19.6 | 14.4 | | 12.4 | |
| Income tax expense | 4.6 | 8.0 | 6.0 | 2.7 | 1.6 | 1.6 | 4.3 | 4.3 |
| Net income | 22.0 | 32.9 | 26.5 | 16.9 | 12.8 | 12.8 | 8.1 | 8.1 |
| |
| Per share information: | | | | | | | | |
| Basic earnings per share (in usd per share) | $2.09 | $3.00 | $2.42 | $1.63 | $1.53 | $1.53 | $1.00 | |
| Diluted earnings per share (in usd per share) | $2.06 | $2.96 | $2.40 | $1.61 | $1.50 | $1.50 | $0.98 | |
| |
| Dividends paid per share (in usd per share) | $0.76 | $0.74 | $0.68 | $0.60 | $0.51 | | $0.42 | |