| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-05-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 8-K |
| Cash flows from operating activities | | | | | | | | |
| Net income | 22.0 | 32.9 | 26.5 | 16.9 | 12.8 | | 8.1 | |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Net premium amortization | 1.9 | -0.4 | -4.5 | -2.5 | 1.4 | | 4.0 | |
| Depreciation and amortization expense | 4.6 | 5.3 | 6.6 | 5.5 | 3.6 | | 3.3 | |
| Share-based compensation | 2.2 | 1.9 | 2.1 | 1.6 | 1.5 | | 1.4 | |
| Gains on sales of loans originated for sale | -1.3 | -5.2 | -5.6 | -2.6 | -2.1 | | -2.4 | |
| Proceeds from sales of loans originated for sale | 77.3 | 204.1 | 209.0 | 108.9 | 94.7 | | 103.1 | |
| Gains on sale of portfolio loans | -0.3 | | -2.8 | | | | | |
| Net gain on sale of OREO and premises held for sale | | -0.3 | 0.2 | -0.2 | -0.1 | | 0.0 | |
| Net loss on disposal of premises and equipment | 0.5 | 0.0 | 0.0 | 0.1 | 0.0 | | 0.0 | |
| Deferred income tax benefit | -0.6 | 0.9 | -2.0 | 1.8 | 0.5 | | 3.1 | |
| Income from life insurance | -2.3 | -2.3 | -2.3 | -2.0 | -1.5 | | -1.1 | |
| Premium on branch sale | | -0.3 | 0.2 | -0.2 | -0.1 | | 0.0 | |
| Decrease (increase) in accrued interest receivable and other assets | -2.8 | 0.7 | -2.9 | 1.2 | -0.9 | | -0.4 | |
| Other, net | -8.8 | -2.0 | 6.7 | 2.1 | 0.5 | | 0.1 | |
| Net cash provided by operating activities | 36.2 | 40.8 | 30.2 | 9.1 | 22.5 | | 16.4 | |
| |
| Cash flows from investing activities | | | | | | | | |
| Proceeds from sales of AFS securities | 31.3 | 149.0 | | 199.4 | 156.4 | | 162.3 | |
| Maturities, repayments and calls of AFS securities | 50.1 | 39.1 | 56.2 | 33.3 | 18.4 | | 28.8 | |
| Purchases of AFS securities | -181.5 | -195.0 | -26.7 | -190.5 | -226.0 | | -203.7 | |
| Net (purchases) redemptions of restricted investments in bank stocks | -3.4 | 3.3 | 5.6 | | | | | |
| Net distributions from investments in limited partnerships | 1.4 | | | | | | | |
| Net increase in loans | -172.6 | 1.4 | -349.9 | -46.2 | -99.8 | | -130.8 | |
| Proceeds from sales of portfolio loans | 4.4 | 0.4 | 22.7 | | 3.6 | | 2.2 | |
| Purchases of bank premises and equipment | -0.9 | -1.3 | -1.3 | -2.9 | -4.8 | | -2.7 | |
| Proceeds from disposal of OREO and premises held for sale | | 1.1 | 4.1 | 1.3 | 1.4 | | 0.5 | |
| Net cash used in investing activities | -271.0 | -2.0 | -292.6 | 18.5 | -139.4 | | -145.9 | |
| |
| Cash flows from financing activities | | | | | | | | |
| Net increase in deposits | 11.3 | 108.0 | 481.3 | -71.6 | 178.8 | | 67.1 | |
| Net (decrease) increase in borrowings with original maturities less than 90 days | 98.6 | 3.8 | -135.4 | -1.0 | -54.9 | | -64.3 | |
| Dividends paid | -8.3 | -8.3 | -7.6 | -6.2 | -4.4 | | -3.5 | |
| Acquisition of treasury stock | -14.2 | -1.9 | -1.2 | | | | | |
| Shares repurchased as treasury stock for employee taxes associated with restricted stock vesting | -0.3 | -0.5 | -0.7 | -1.8 | -0.7 | | | |
| Net cash provided by (used in) financing activities | 86.9 | 44.7 | 331.7 | -60.4 | 175.9 | | 129.1 | |
| |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid during the period for: | | | | | | | | |
| Interest | 8.7 | 6.8 | 16.7 | 24.3 | 12.9 | | 7.6 | |
| Income taxes | 4.9 | 4.4 | 0.6 | | 0.1 | | 1.6 | |
| Supplemental schedule of noncash activities: | | | | | | | | |
| Loans transferred from LHFS to portfolio loans | 1.5 | | | | | | | |
| OREO acquired in settlement of loans | | | | 0.2 | 0.5 | | 1.0 | |