| 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 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Interest income: | | | | | | | |
| Loans, including fees | 95.7 | 76.1 | 82.2 | 65.5 | 49.1 | 41.1 | 28.4 |
| Investment securities | 6.1 | 3.9 | 3.0 | | | | |
| Fed funds sold and interest-bearing balances in banks | 4.0 | 0.7 | 1.3 | | | | |
| FHLB dividends | 0.7 | 0.5 | 0.3 | 0.5 | 0.4 | 0.4 | 0.3 |
| FRB dividends | 0.5 | 0.5 | 0.5 | 0.3 | 0.2 | 0.1 | 0.1 |
| Total interest and dividend income | 107.1 | 81.6 | 87.2 | 76.5 | 56.9 | 44.3 | 29.6 |
| |
| Interest expense: | | | | | | | |
| Deposits | 6.3 | 4.9 | 7.0 | 8.2 | 4.5 | 3.9 | 3.1 |
| Subordinated debt | 3.6 | 3.6 | 1.4 | 0.1 | 0.1 | | |
| Junior subordinated deferrable interest debentures | 0.5 | 0.3 | 0.5 | 0.6 | 0.5 | 0.4 | |
| Total interest expense | 10.4 | 8.8 | 8.9 | 17.5 | 9.9 | 8.7 | 3.1 |
| Net interest income | 96.7 | 72.8 | 78.3 | 67.8 | 51.9 | 39.9 | 26.6 |
| (Reversal of) provision for credit losses | 4.4 | 0.5 | 10.3 | 2.2 | 1.8 | 0.5 | 0.6 |
| Net interest income after (reversal of) provision for credit losses | 92.3 | 72.3 | 68.0 | 65.6 | 50.1 | 39.5 | 26.0 |
| |
| Noninterest income: | | | | | | | |
| Gain on sale of loans | 2.7 | 4.8 | 1.8 | 3.0 | 2.1 | 2.2 | |
| |
| Service charges and other fees | | | | | | | |
| Loan servicing and other loan fees | 2.2 | 1.8 | 2.5 | 1.9 | 1.2 | | |
| Bargain purchase gain | 1.7 | | | | | | |
| Other income and fees | 1.0 | 1.0 | 1.1 | | 1.3 | | 0.4 |
| Total noninterest income | 10.7 | 11.3 | 8.8 | 9.6 | 7.1 | 4.8 | 1.4 |
| |
| Noninterest expense: | | | | | | | |
| Salaries and employee benefits | 40.5 | 33.8 | 33.9 | 28.8 | 21.4 | 17.0 | 10.6 |
| Occupancy and equipment | 8.4 | 7.4 | 7.1 | 5.1 | 4.3 | 3.2 | 2.1 |
| Data processing | 7.0 | 5.6 | 8.2 | 8.4 | 3.8 | 4.7 | 1.4 |
| Other expense | 10.1 | 8.4 | 9.3 | 9.1 | 7.2 | 5.1 | 2.8 |
| Total noninterest expense | 65.9 | 55.1 | 58.5 | 51.5 | 36.7 | 30.1 | 17.0 |
| Income before provision for income taxes | 37.0 | 28.5 | 18.2 | 23.7 | 20.5 | | |
| Provision for income taxes | 10.0 | 7.8 | 4.5 | 6.4 | 6.0 | 8.9 | 4.4 |
| Net income | 27.0 | 20.7 | 13.7 | 17.3 | 14.5 | 5.3 | 5.9 |
| |
| Earnings per common share: | | | | | | | |
| Basic earnings per common share (in dollars per share) | $2.06 | $1.90 | $1.15 | $1.47 | $1.50 | $0.81 | $1.10 |
| |
| Weighted average common shares outstanding (in shares) | 13.1 | 10.9 | 12.0 | 11.8 | 9.7 | 6.5 | 5.4 |
| Diluted earnings per common share (in dollars per share) | $2.06 | $1.90 | $1.15 | $1.47 | $1.50 | $0.81 | $1.09 |
| Weighted average common shares outstanding (in shares) | 13.1 | 10.9 | 12.0 | 11.8 | 9.7 | 6.5 | 5.4 |