| 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 | | | | | | | | |
| Loans, including fees | 112.7 | 101.6 | 99.1 | 94.4 | 94.3 | 69.2 | 63.7 | 54.5 |
| |
| Investment securities: | | | | | | | | |
| Taxable interest | 9.6 | 4.3 | 4.2 | 5.9 | 5.9 | 3.9 | 3.0 | 3.0 |
| Tax-exempt interest | 0.5 | 0.3 | 0.3 | 0.5 | 0.7 | 0.6 | 0.7 | 0.7 |
| Other investments and deposits | 3.1 | 0.7 | 0.5 | 1.4 | 1.4 | 0.7 | 0.3 | 0.2 |
| Total interest income | 125.9 | 106.9 | 104.1 | 102.2 | 102.3 | 74.4 | 67.7 | 58.4 |
| |
| Interest Expense | | | | | | | | |
| Deposits | 5.2 | 5.2 | 11.0 | 15.1 | 9.1 | 5.2 | 3.7 | 3.1 |
| Subordinated debt expense | 1.7 | | | | | | | |
| Short-term Federal Home Loan Bank advances | 0.4 | | 0.0 | | | | | |
| Long-term Federal Home Loan Bank advances | 0.4 | 0.5 | 0.6 | 0.9 | 1.1 | 1.3 | 1.4 | 0.7 |
| Total interest expense | 7.9 | 5.9 | 11.9 | 16.2 | 10.3 | 6.5 | 5.3 | 3.9 |
| Net interest income | 118.0 | 101.0 | 92.2 | 86.0 | 92.0 | 67.8 | 62.4 | 54.5 |
| Net interest income after provision for loan losses | 110.5 | 111.2 | 79.5 | 83.0 | 88.1 | 65.5 | 59.2 | 52.5 |
| |
| Noninterest Income | | | | | | | | |
| Fees and charges | | | | | | | | |
| Gain on sale of loans, net | 0.7 | 2.5 | 2.9 | 1.1 | 0.9 | 1.2 | 1.8 | 1.5 |
| Income from bank-owned life insurance | 0.9 | 2.6 | 1.0 | 2.1 | 0.7 | 0.5 | 0.5 | 0.5 |
| Loss on sale of assets, net | 0.0 | -0.5 | 0.0 | -0.3 | -0.1 | -0.2 | 0.6 | -0.5 |
| Other income | 1.1 | 1.0 | 0.9 | 1.2 | 1.1 | 1.2 | 1.6 | 0.9 |
| Total noninterest income | 13.9 | 16.3 | 14.3 | 14.4 | 13.4 | 10.0 | 11.2 | 18.0 |
| |
| Noninterest Expense | | | | | | | | |
| Compensation and benefits | 47.8 | 39.2 | 37.9 | 38.4 | 36.8 | 28.2 | 27.6 | 25.0 |
| Occupancy | 8.7 | 7.0 | 6.8 | 7.1 | 6.7 | 5.1 | 5.3 | 4.9 |
| Marketing and advertising | 2.3 | 1.9 | 1.1 | 1.6 | 1.3 | 1.2 | 1.1 | 0.5 |
| Data processing and communication | 9.3 | 8.5 | 7.3 | 6.6 | 7.6 | 4.3 | 5.0 | 4.0 |
| Professional services | 1.7 | 1.2 | 0.9 | 0.9 | 1.1 | 1.6 | 1.0 | 1.8 |
| Forms, printing and supplies | 0.8 | 0.6 | 0.6 | 0.7 | 1.0 | 0.6 | 0.6 | 0.6 |
| Franchise and shares tax | 2.1 | 1.5 | 1.5 | 1.4 | 1.0 | 0.9 | 0.8 | 0.7 |
| Regulatory fees | 2.1 | 1.3 | 1.4 | 0.8 | 1.6 | 1.3 | 1.3 | 1.1 |
| Amortization of acquisition intangible | 1.6 | 1.2 | 1.4 | 1.6 | 1.8 | 0.8 | 0.8 | |
| Provision for credit losses on unfunded commitments | 0.3 | 0.4 | | | | | | |
| Other expenses | 4.7 | 3.9 | 3.6 | 3.9 | 3.9 | 2.6 | 3.2 | 3.0 |
| Total noninterest expense | 81.9 | 67.0 | 63.0 | 63.6 | 63.2 | 46.2 | 46.8 | 42.0 |
| Income before income tax expense | 42.5 | 60.4 | 30.8 | 33.8 | 38.3 | 29.3 | 23.6 | 19.2 |
| Income tax expense | 8.4 | 11.8 | 6.0 | 5.9 | 6.7 | 12.5 | 7.6 | 6.7 |
| Net Income | 34.1 | 48.6 | 24.8 | 27.9 | 31.6 | 16.8 | 16.0 | 12.5 |
| |
| Earnings per share: | | | | | | | | |
| Basic (in usd per share) | $4.19 | $5.80 | $2.86 | $3.08 | $3.48 | $2.36 | $2.34 | $1.87 |
| Diluted (in usd per share) | $4.16 | $5.77 | $2.85 | $3.05 | $3.40 | $2.28 | $2.25 | $1.79 |
| |
| Cash dividends declared per common share (in usd per share) | $0.93 | $0.91 | $0.88 | $0.84 | $0.71 | $0.55 | $0.41 | $0.30 |