| 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 |
| Cash flows from operating activities: | | | | | | | | |
| Net income | 11.3 | 16.6 | 18.7 | 20.0 | 16.5 | 20.2 | 18.8 | 17.5 |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Provision for credit losses | 0.7 | 0.8 | 0.8 | -3.0 | 0.1 | -2.8 | | |
| Depreciation of premises and equipment | | 0.9 | 0.9 | 0.8 | 0.8 | 0.9 | 0.9 | 0.8 |
| Net amortization of premiums and discounts on securities and loans | | 0.4 | 0.6 | 0.9 | 1.0 | 0.7 | 0.4 | 1.5 |
| Amortization of intangibles | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Share-based compensation | | 0.7 | 1.0 | 0.7 | 0.9 | 0.6 | 0.8 | 1.0 |
| Tax benefit (expense) from stock option exercises and other equity awards | | | | 0.1 | | | | |
| Income from bank-owned life insurance | -0.9 | -0.7 | -0.7 | -0.6 | -0.6 | -1.1 | -0.6 | -0.6 |
| Net gains on loan sales, including changes in fair value | | -0.6 | -1.5 | -1.6 | -3.1 | -4.1 | -6.2 | -6.0 |
| Proceeds from sales of loans, net | | 46.8 | 67.5 | 73.2 | 122.2 | 228.3 | 170.5 | 243.9 |
| Loans originated for sale | | -30.7 | -68.2 | -78.3 | -95.6 | -252.9 | -142.0 | -193.4 |
| (Increase) decrease in operating lease right-of-use assets | | 0.6 | 0.3 | 0.7 | -2.1 | 0.8 | 0.8 | 0.4 |
| Increase (decrease) in operating lease liabilities | | -0.6 | -0.3 | -0.7 | 2.2 | -0.8 | -0.7 | -0.4 |
| (Increase) decrease in other assets | | -3.1 | -24.4 | -24.6 | 21.3 | 4.8 | 7.2 | -3.6 |
| Increase (decrease) in other liabilities | | 8.6 | 25.2 | 25.3 | -25.1 | -3.0 | -2.6 | 1.4 |
| Net cash provided by (used in) operating activities | 11.3 | 41.2 | 20.2 | 13.0 | 38.6 | -6.1 | 47.5 | 62.8 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of mortgage-backed securities available for sale | | | | -156.9 | | | | |
| Purchases of other debt securities available for sale | | | -0.5 | -10.0 | -0.3 | -30.3 | -46.5 | -97.1 |
| Maturities, calls and principal payments of mortgage-backed securities available for sale | | 18.6 | 22.8 | 31.3 | 43.3 | 63.6 | 67.7 | 91.8 |
| Maturities, calls and principal payments of other debt securities available for sale | | | | | | 12.3 | 50.0 | 0.5 |
| Net (increase) decrease in loans | | -260.5 | -368.0 | -195.2 | -8.7 | 52.1 | -23.9 | -63.7 |
| Purchases of premises and equipment | -1.9 | -2.3 | -1.3 | -1.6 | -0.8 | -1.3 | -0.3 | -0.9 |
| Purchases of bank-owned life insurance | | | | -7.0 | | | | -7.0 |
| Equity investment in real estate limited partnership | | | | -1.9 | | | | |
| Net cash provided by (used in) investing activities | -1.9 | -275.3 | -411.0 | -275.3 | -37.4 | 49.0 | -16.8 | -210.4 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Net increase (decrease) in deposits | | -50.9 | 63.2 | -121.3 | 147.9 | -78.1 | 332.5 | 176.5 |
| Proceeds from Federal Home Loan Bank advances | | 1,210.0 | 1,166.1 | 583.0 | 197.0 | 121.2 | 164.0 | 595.0 |
| Repayments of Federal Home Loan Bank advances | | | | -597.0 | | | | |
| Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered | | -0.1 | | -0.7 | 0.0 | 0.0 | | 0.1 |
| Cash dividends paid | | -9.3 | -9.3 | -9.6 | -9.4 | -9.0 | -9.0 | -9.3 |
| Net cash provided by (used in) financing activities | | 219.7 | 425.0 | 132.8 | 48.5 | -164.7 | 137.4 | 109.0 |
| Net increase (decrease) in cash and cash equivalents | | -14.4 | 34.2 | -129.5 | 49.6 | -121.9 | 168.2 | -38.5 |
| |
| Noncash Activities: | | | | | | | | |
| Loans charged off | | | | 0.1 | | | | |
| Commitment for equity investment in real estate limited partnership | | | | 8.4 | | | | |
| Supplemental Disclosures: | | | | | | | | |
| Interest payments | | 16.4 | 8.0 | 4.2 | 3.5 | 3.6 | 3.9 | 4.6 |
| Income tax payments | | 4.7 | 5.4 | 6.7 | 0.9 | 4.1 | 5.6 | 8.3 |