| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 8-K | 8-K | 10-Q | 10-Q | 8-K | 10-Q |
| Interest and dividend income: | | | | | | | | |
| Interest and fees on loans | 160.9 | 153.5 | | | 107.2 | 101.4 | | 86.7 |
| Taxable interest and dividends on securities | 24.6 | 28.6 | | | 31.1 | 27.9 | | |
| Non-taxable interest and dividends on securities | 1.4 | 1.4 | | | 1.9 | 1.8 | | |
| Interest on federal funds sold and other short-term investments | 14.9 | 5.3 | 0.5 | -1.2 | 0.7 | 0.4 | 0.1 | 0.6 |
| Total interest and dividend income | 201.8 | 188.9 | 175.0 | 17.2 | 140.9 | 131.5 | 50.2 | 103.5 |
| |
| Interest expense: | | | | | | | | |
| Interest on deposits | 56.1 | 42.9 | 17.5 | 12.9 | 3.1 | 3.3 | 15.7 | 0.7 |
| Interest on borrowings | 4.0 | 7.6 | | | 0.1 | 0.0 | | 0.0 |
| Total interest expense | 60.2 | 50.6 | 25.0 | 19.7 | 3.1 | 3.4 | 23.5 | 0.8 |
| Net interest income | 141.6 | 138.3 | 150.0 | 34.7 | 137.8 | 128.1 | 27.6 | 102.7 |
| Provision for allowance for loan losses | 7.5 | | | | 1.1 | | | |
| Net interest income after provision for allowance for loan losses | 134.1 | 138.3 | | | 136.7 | 128.6 | | 104.2 |
| |
| Noninterest income (loss): | | | | | | | | |
| Insurance commissions | 27.6 | 31.5 | | | 24.7 | 28.7 | | 22.0 |
| Service charges on deposit accounts | 7.2 | 6.5 | 6.8 | 0.1 | 8.3 | 8.5 | -0.4 | 5.9 |
| Trust and investment advisory fees | 6.1 | 5.8 | 5.6 | -0.2 | 6.0 | 6.1 | -0.9 | 6.3 |
| Debit card processing fees | 3.5 | 3.2 | 3.2 | 0.0 | 3.2 | 2.9 | 0.1 | 3.0 |
| Interest rate swap income | 0.8 | | | | 1.6 | | | |
| Income (losses) from investments held in rabbi trusts | 3.0 | 2.9 | | | -7.3 | -4.4 | | |
| (Losses) gains on sales of mortgage loans held for sale, net | -0.1 | -0.1 | | | 0.0 | 0.2 | | |
| Losses on sales of securities available for sale, net | | -333.2 | | | -0.1 | -2.2 | | |
| Other | 5.6 | 5.6 | | | 5.4 | 3.6 | | 4.7 |
| Total noninterest income (loss) | 53.8 | -278.3 | 44.5 | 1.2 | 41.9 | 46.4 | -4.5 | 43.2 |
| |
| Noninterest expense: | | | | | | | | |
| Salaries and employee benefits | 79.2 | 78.5 | | | 73.0 | 69.5 | | 66.2 |
| Office occupancy and equipment | 9.8 | 9.9 | | | 9.9 | 11.6 | | 8.0 |
| Data processing | 13.9 | 13.4 | | | 14.3 | 15.3 | | 12.2 |
| Professional services | 4.1 | 3.4 | | | 3.5 | 4.0 | | 4.0 |
| Marketing expenses | 2.1 | 1.1 | 3.1 | 0.9 | 2.7 | 1.6 | 1.2 | 1.6 |
| Loan expenses | 1.1 | 1.1 | 0.6 | -1.7 | 1.6 | 1.9 | -1.3 | 1.6 |
| FDIC insurance | 3.0 | 2.5 | | | 1.7 | 1.4 | | 1.1 |
| Amortization of intangible assets | 1.2 | 1.0 | 1.1 | 0.1 | 0.9 | 0.8 | 0.4 | 0.6 |
| Other | 7.2 | 5.4 | | | 3.5 | 2.7 | | 3.7 |
| Total noninterest expense | 121.6 | 116.3 | 132.8 | 15.9 | 111.1 | 108.9 | -10.9 | 99.0 |
| Income (loss) before income tax expense (benefit) | 66.3 | -256.3 | | | 67.4 | 66.2 | | 48.4 |
| Income tax expense (benefit) | 17.6 | -62.2 | 8.6 | -8.9 | 16.3 | 14.6 | 11.1 | 11.3 |
| Net income (loss) | 48.7 | -194.1 | 42.3 | 0.0 | 51.2 | 51.5 | 0.0 | 37.1 |
| |
| Basic earnings per share (in dollars per share) | $0.30 | ($1.20) | $0.26 | $0.33 | $0.31 | $0.30 | $0.20 | $0.22 |
| Diluted earnings per share (in dollars per share) | $0.30 | ($1.20) | $0.26 | $0.33 | $0.31 | $0.30 | $0.20 | $0.22 |