| In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Interest income: | | | | | | | | |
| Loans, including fees | | 95.7 | 89.7 | 84.1 | 79.8 | 76.1 | 76.0 | 77.7 |
| FHLB dividends | | 0.7 | 0.6 | 0.6 | 0.5 | 0.5 | 0.4 | 0.4 |
| FRB dividends | | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Total interest and dividend income | | 107.1 | 98.9 | 91.8 | 86.1 | 81.6 | 80.9 | 82.2 |
| |
| Interest expense: | | | | | | | | |
| Deposits | | 6.3 | 5.5 | 5.4 | 5.1 | 4.9 | 5.1 | 5.4 |
| Subordinated debt | | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.3 | 3.0 |
| Junior subordinated deferrable interest debentures | | 0.5 | 0.4 | 0.4 | 0.3 | 0.3 | 0.6 | 0.6 |
| Total interest expense | | 10.4 | 9.5 | 9.3 | 9.1 | 8.8 | 9.0 | 9.0 |
| Net interest income | | 96.7 | 89.4 | 82.5 | 77.1 | 72.8 | 71.9 | 73.2 |
| (Reversal of) provision for credit losses | | 4.4 | 4.3 | 3.6 | 0.5 | 0.5 | 1.9 | 3.7 |
| Net interest income after (reversal of) provision for credit losses | | 92.3 | 85.1 | 78.9 | 76.6 | 72.3 | 70.0 | 69.5 |
| |
| Noninterest income: | | | | | | | | |
| Gain on sale of loans | | 2.7 | 3.8 | 4.7 | 5.4 | 4.8 | 4.5 | 2.5 |
| |
| Service charges and other fees | | | | | | | | |
| Loan servicing and other loan fees | | 2.2 | 2.1 | 2.0 | 1.9 | 1.8 | 2.0 | 2.2 |
| Bargain purchase gain | | | | | 1.7 | | | |
| Other income and fees | | 1.0 | 1.0 | 1.0 | 0.9 | 0.9 | 1.1 | 1.1 |
| Total noninterest income | | 9.1 | 10.2 | 11.5 | 13.4 | 11.3 | 11.8 | 9.6 |
| |
| Noninterest expense: | | | | | | | | |
| Salaries and employee benefits | | 40.5 | 38.4 | 36.4 | 35.2 | 33.8 | 33.7 | 34.0 |
| Occupancy and equipment | | 8.4 | 8.2 | 8.1 | 8.0 | 7.4 | 7.4 | 7.2 |
| Data processing | | 7.0 | 6.8 | 6.8 | 6.4 | 5.6 | 5.7 | 5.9 |
| Other expense | | 10.1 | 10.0 | 10.0 | 9.8 | 8.4 | 8.5 | 8.5 |
| Total noninterest expense | | 65.9 | 63.4 | 61.2 | 59.4 | 55.1 | 55.3 | 55.6 |
| Income before provision for income taxes | | 35.2 | 31.6 | 28.8 | 30.7 | 28.5 | 21.0 | 13.6 |
| Provision for income taxes | | 9.5 | 8.6 | 7.6 | 8.0 | 7.8 | 6.7 | 5.9 |
| Net income | | 25.7 | 23.1 | 21.2 | 22.6 | 20.7 | 19.8 | 17.6 |
| |
| Earnings per common share: | | | | | | | | |
| Basic earnings per common share (in dollars per share) | | $1.96 | $1.85 | $1.82 | $2.02 | $1.91 | $1.79 | $1.55 |
| |
| Weighted average common shares outstanding (in shares) | | 13.2 | 12.6 | 11.9 | 11.3 | 10.9 | 11.2 | 11.5 |
| Diluted earnings per common share (in dollars per share) | | $1.96 | $1.85 | $1.82 | $2.02 | $1.91 | $1.79 | $1.55 |
| Weighted average common shares outstanding (in shares) | | 13.2 | 12.6 | 11.9 | 11.3 | 10.9 | 11.2 | 11.5 |