| 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 | 10-K | 10-Q |
| Interest Income | | | | | | | | |
| Interest and fees on loans | 94.0 | 78.5 | | | 129.2 | 126.9 | 125.4 | 126.4 |
| Taxable interest on investments | 11.8 | 11.8 | | | 22.3 | 20.8 | 18.9 | 17.5 |
| Nontaxable interest on investments | 1.5 | 1.5 | | | 3.0 | 3.0 | 3.0 | 3.1 |
| Dividend income | 0.8 | 0.6 | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 | 0.5 |
| Other interest income | 1.7 | 1.4 | 1.1 | 0.9 | 0.8 | 0.8 | 0.8 | 0.7 |
| Total interest income | 202.7 | 186.7 | 172.8 | 162.9 | 155.7 | 152.0 | 148.5 | 148.2 |
| |
| Interest Expense | | | | | | | | |
| Interest on deposits | 51.0 | 34.3 | 20.3 | 11.7 | 8.3 | 7.7 | 7.9 | 8.5 |
| Interest on borrowings | 7.7 | 4.6 | 2.6 | 1.5 | 0.9 | 0.6 | 0.6 | 0.7 |
| Interest on junior subordinated debentures | 1.1 | 1.1 | | | 2.1 | 2.2 | 2.5 | 2.8 |
| Total interest expense | 60.9 | 41.0 | 25.1 | 15.4 | 11.3 | 10.5 | 11.0 | 12.1 |
| Net interest income | 141.8 | 145.6 | 147.7 | 147.5 | 144.4 | 141.4 | 137.4 | 136.1 |
| Provision for credit losses | 2.1 | 4.3 | | | 3.4 | -2.3 | -3.2 | -4.2 |
| Net interest income after provision for credit losses | 64.9 | 66.5 | | | 141.0 | 143.7 | 140.6 | 140.3 |
| |
| Non-Interest Income | | | | | | | | |
| Revenue | | | | | | | | |
| Brokerage and insurance commissions | 4.1 | 4.2 | 4.1 | 4.3 | 4.3 | 4.0 | 3.9 | 3.7 |
| Mortgage banking income, net | 3.0 | 3.9 | 4.2 | 5.3 | 6.5 | 7.6 | 13.7 | 17.2 |
| Bank-owned life insurance | 1.2 | 1.2 | | | 2.3 | 2.3 | 2.4 | 2.4 |
| Net loss on sale of securities | | | | | 0.0 | | | |
| Other income | 4.3 | 4.3 | 4.0 | 4.0 | 3.7 | 3.6 | 3.5 | 3.6 |
| Total non-interest income | 39.7 | 40.7 | 40.7 | 43.0 | 44.2 | 44.3 | 49.7 | 52.0 |
| |
| Non-Interest Expense | | | | | | | | |
| Salaries and employee benefits | 29.9 | 30.0 | | | 62.1 | 62.0 | 61.0 | 62.0 |
| Furniture, equipment and data processing | 13.1 | 13.1 | 13.0 | 12.9 | 12.6 | 12.4 | 12.2 | 12.1 |
| Net occupancy costs | 3.9 | 3.9 | | | 7.7 | 7.7 | 7.5 | 7.4 |
| Debit card expense | 4.9 | 4.7 | 4.6 | 4.6 | 4.5 | 4.4 | 4.3 | 4.1 |
| Consulting and professional fees | 2.4 | 2.3 | | | 4.1 | 3.8 | 3.7 | 3.6 |
| Regulatory assessments | 2.9 | 2.5 | 2.3 | 2.3 | 2.3 | 2.2 | 2.1 | 2.0 |
| Amortization of core deposit intangible assets | 0.3 | 0.3 | | | 0.6 | 0.6 | 0.7 | 0.7 |
| Other expenses | 6.2 | 6.1 | | | 12.0 | 11.8 | 12.3 | 11.6 |
| Total non-interest expense | 107.4 | 106.8 | 106.8 | 106.8 | 106.0 | 105.0 | 103.7 | 103.4 |
| Income before income tax expense | 31.5 | 34.8 | | | 79.2 | 83.1 | 86.6 | 88.8 |
| Income Tax Expense | 14.0 | 14.6 | 15.6 | 15.9 | 16.2 | 17.0 | 17.6 | 18.0 |
| Net Income | 54.7 | 57.4 | 61.4 | 62.6 | 63.0 | 66.1 | 69.0 | 70.8 |
| |
| Per Share Data | | | | | | | | |
| Basic earnings per share | $3.74 | $3.91 | $4.18 | $4.24 | $4.25 | $4.44 | $4.62 | $4.73 |
| Diluted earnings per share | $3.74 | $3.91 | $4.17 | $4.23 | $4.23 | $4.42 | $4.60 | $4.71 |
| |
| Cash dividends declared per share | $0.84 | $0.82 | | | $1.56 | $1.52 | $1.48 | $1.41 |
| |
| Weighted average number of common shares outstanding | 14.6 | 14.6 | 14.7 | 14.8 | 14.8 | 14.9 | 14.9 | 14.9 |
| Diluted weighted average number of common shares outstanding | 14.6 | 14.7 | 14.7 | 14.8 | 14.9 | 15.0 | 15.0 | 15.0 |