| In millions, except per share items | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Interest income: | | | | | | | | |
| Loans | | 48.4 | 47.1 | 47.0 | 47.4 | 47.2 | 45.3 | 43.5 |
| Investment securities - taxable | | 2.0 | 1.7 | 1.3 | 1.2 | 1.0 | 0.8 | 0.7 |
| Mortgage-backed securities | | 5.4 | 5.0 | 4.7 | 4.4 | 4.3 | 4.2 | 5.0 |
| Investment securities - tax exempt | | 10.5 | 9.5 | 8.7 | 8.4 | 8.1 | 8.0 | 7.9 |
| Interest-bearing deposits and federal funds sold | | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Total interest income | | 66.5 | 63.4 | 62.0 | 61.5 | 60.6 | 58.3 | 57.1 |
| |
| Interest expense: | | | | | | | | |
| Interest on deposits | | 4.6 | 3.5 | 3.3 | 3.5 | 3.7 | 4.2 | 5.1 |
| Interest on borrowings | | 2.4 | 2.0 | 1.6 | 1.4 | 1.2 | 1.0 | 0.7 |
| Total interest expense | | 7.0 | 5.4 | 4.9 | 4.9 | 4.9 | 5.2 | 5.9 |
| Net interest income | | 59.4 | 58.0 | 57.1 | 56.6 | 55.7 | 53.1 | 51.3 |
| |
| Provision for loan losses | | | | | | | | |
| Net interest income after provision for loan losses | | 57.6 | 54.7 | 54.6 | 52.8 | 52.0 | 49.2 | 46.1 |
| |
| Noninterest income: | | | | | | | | |
| Service charges on deposit accounts | | 4.6 | 4.4 | 4.1 | 3.9 | 3.7 | 3.4 | 3.2 |
| Debit card fees | | 4.4 | 4.4 | 4.3 | 4.2 | 4.1 | 3.9 | 3.5 |
| Investment services | | 0.9 | 0.9 | 0.9 | 0.8 | 0.8 | 0.7 | 0.7 |
| E-commerce fees | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Bank-owned life insurance | | 1.3 | 1.3 | 1.2 | 1.0 | 0.7 | 0.4 | 0.2 |
| Other operating income | | 1.0 | 1.0 | 1.3 | 1.2 | 1.2 | 1.1 | 1.1 |
| Total noninterest income | | 12.3 | 12.1 | 11.9 | 11.4 | 10.5 | 9.7 | 8.8 |
| |
| Noninterest expense: | | | | | | | | |
| Salaries and employee benefits | | 21.4 | 20.7 | 20.3 | 19.8 | 19.5 | 19.2 | 18.8 |
| Occupancy expense | | 2.3 | 2.3 | 2.2 | 2.3 | 2.2 | 2.2 | 2.0 |
| Equipment and furniture expense | | 0.8 | 0.8 | 0.7 | 0.7 | 0.6 | 0.6 | 0.6 |
| Service and data processing fees | | 2.7 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 |
| Computer software, supplies and support | | 1.5 | 1.5 | 1.5 | 1.5 | 1.4 | 1.4 | 1.3 |
| Advertising and promotion | | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.3 |
| FDIC insurance premiums | | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | 0.7 |
| Legal and professional fees | | 1.5 | 1.4 | 1.3 | 1.4 | 1.3 | 1.2 | 1.2 |
| Other | | 3.3 | 3.3 | 2.8 | 3.3 | 3.1 | 2.8 | 3.0 |
| Total noninterest expense | | 34.8 | 34.0 | 32.8 | 32.8 | 32.1 | 31.2 | 30.7 |
| Income before provision for income taxes | | 35.2 | 32.9 | 33.7 | 31.3 | 30.5 | 27.6 | 18.8 |
| Provision for income taxes | | 5.3 | 4.9 | 4.9 | 4.5 | 4.3 | 3.7 | 3.2 |
| Net income | | 29.9 | 28.0 | 28.8 | 26.9 | 26.2 | 23.9 | 21.0 |
| |
| Basic earnings per share (in dollars per share) | | $3.09 | $2.87 | $2.96 | $3.16 | $3.08 | $2.81 | $2.48 |
| Diluted earnings per share (in dollars per share) | | $3.09 | $2.87 | $2.96 | $3.16 | $3.08 | $2.81 | $2.48 |
| |
| Basic average shares outstanding (in shares) | | 10.6 | 10.6 | 10.6 | 8.5 | 8.5 | 8.5 | 8.5 |
| Diluted average shares outstanding (in shares) | | 10.6 | 10.6 | 10.6 | 8.5 | 8.5 | 8.5 | 8.5 |
| |
| Dividends per share (in dollars per share) | | $0.47 | $0.46 | $0.45 | $0.50 | $0.49 | $0.48 | $0.47 |