| 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 | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Cash flows from operating activities | | | | | | | | |
| Net income | 9.8 | 9.2 | 9.6 | -4.8 | 8.9 | 8.4 | 6.7 | 7.2 |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Net premium amortization | 0.5 | 0.4 | 0.6 | 0.8 | 0.5 | 0.1 | 0.3 | 0.1 |
| Depreciation and amortization expense | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 |
| Share-based compensation | 0.5 | 0.6 | 0.5 | 0.7 | 0.5 | 0.3 | 0.5 | 0.5 |
| Gains on sales of loans originated for sale | -0.1 | -0.1 | 0.0 | -0.9 | -0.2 | -0.6 | -1.0 | -1.5 |
| Fair value adjustments on loans held for sale | 0.1 | -0.3 | | | 0.4 | 0.3 | | |
| Mortgage loans originated for sale | -4.5 | -5.3 | | | -23.5 | -32.9 | | |
| Proceeds from sales of loans originated for sale | 5.3 | 9.2 | 9.7 | 12.1 | 22.5 | 32.7 | 44.7 | 49.5 |
| Gains on sale of portfolio loans | | | | | 0.0 | -0.3 | | |
| Net gain on sale of OREO and premises held for sale | -1.5 | | | | | | -0.3 | |
| Net loss on disposal of premises and equipment | 0.2 | 0.0 | 0.0 | 0.5 | 0.0 | 0.0 | | |
| Deferred income tax benefit | -0.4 | 1.3 | 1.9 | -4.0 | -0.1 | 1.6 | 1.2 | 2.1 |
| Investment securities losses | 0.0 | 0.0 | | | 0.0 | 0.1 | | |
| Income from life insurance | -0.6 | -0.6 | -0.6 | -0.6 | -0.6 | -0.6 | -0.6 | -0.6 |
| Premium on branch sale | -1.5 | | | | | | -0.3 | |
| Decrease (increase) in accrued interest receivable and other assets | 1.5 | 1.3 | -1.8 | -0.8 | 1.1 | -2.8 | -0.2 | -0.1 |
| Other, net | 0.2 | 0.2 | 0.0 | -3.1 | 0.6 | 0.7 | 2.1 | -0.8 |
| Net cash provided by operating activities | 16.2 | 5.4 | -1.6 | 12.5 | 18.6 | 6.6 | 10.6 | 10.4 |
| |
| Cash flows from investing activities | | | | | | | | |
| Proceeds from sales of AFS securities | | | 28.3 | | | 3.1 | | 73.3 |
| Maturities, repayments and calls of AFS securities | 8.1 | 11.1 | 7.7 | 9.0 | 23.9 | 9.5 | 8.6 | 9.3 |
| Purchases of AFS securities | | -9.5 | -41.9 | -18.1 | -26.6 | -94.9 | -38.1 | -80.1 |
| Net (purchases) redemptions of restricted investments in bank stocks | 0.3 | -2.2 | -3.4 | | 0.3 | 0.5 | | |
| Net distributions from investments in limited partnerships | | 0.3 | | 1.4 | | 1.1 | | |
| Net increase in loans | -27.1 | -56.1 | -63.2 | -70.2 | -39.3 | 0.1 | -40.1 | 6.2 |
| Proceeds from sales of portfolio loans | | | | | 0.5 | 3.9 | | |
| Investment in limited partnerships | -1.0 | | | | | | | |
| Purchases of bank premises and equipment | -1.3 | -0.2 | -0.1 | -0.3 | -0.2 | -0.2 | -0.4 | -0.3 |
| Proceeds from disposal of OREO and premises held for sale | 1.7 | | | | | | | |
| Net cash paid in branch sale | -17.7 | | | | | | | |
| Net cash used in investing activities | -36.7 | -56.6 | -73.5 | -79.4 | -41.2 | -77.0 | -68.8 | 11.0 |
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| Cash flows from financing activities | | | | | | | | |
| Net increase in deposits | 26.1 | 39.4 | -29.6 | 27.2 | -67.4 | 81.1 | -37.2 | 8.0 |
| Net (decrease) increase in borrowings with original maturities less than 90 days | -24.0 | 13.0 | 100.9 | -3.2 | -0.3 | 1.3 | -4.3 | 4.7 |
| Dividends paid | -2.1 | -2.1 | -2.0 | -2.0 | -2.1 | -2.1 | -2.1 | -2.1 |
| Acquisition of treasury stock | -1.4 | -1.2 | -0.1 | | -9.9 | -4.2 | -0.8 | -1.1 |
| Shares repurchased as treasury stock for employee taxes associated with restricted stock vesting | | -0.4 | 0.0 | 0.0 | | -0.2 | | |
| Proceeds from issuance of employee stock purchase plan shares | | 0.1 | | 0.1 | | 0.1 | | 0.1 |
| Net cash provided by (used in) financing activities | -1.6 | 88.7 | 68.9 | 21.9 | -79.8 | 75.8 | -44.5 | -46.8 |
| Net increase (decrease) in cash and cash equivalents | 15.5 | | | | -96.8 | | | |
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| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid during the period for: | | | | | | | | |
| Interest | 10.9 | 7.0 | 4.8 | 1.5 | 1.7 | 0.7 | 1.8 | 1.1 |
| Income taxes | 2.0 | | 1.5 | 1.7 | 1.7 | | 0.3 | 2.0 |
| Supplemental schedule of noncash activities: | | | | | | | | |
| Loans transferred from LHFS to portfolio loans | | | | | | 1.5 | | |
| OREO acquired in settlement of loans | | 0.1 | | | | | | |
| Operating lease ROU assets | 2.4 | | | | | | | |