| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Operating Activities | | | | | | | | |
| Net Income | 61.4 | 69.0 | 59.5 | 57.2 | 53.1 | 28.5 | 40.1 | 21.0 |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Originations of mortgage loans held for sale | -152.2 | -436.7 | -654.1 | -282.4 | -202.2 | -211.6 | -236.5 | -72.0 |
| Proceeds from the sale of mortgage loans | 156.1 | 484.7 | 640.8 | 281.2 | 211.4 | 224.9 | 238.4 | 62.5 |
| Gain on sale of mortgage loans, net of origination costs | -3.4 | -13.3 | -15.3 | -6.4 | -5.5 | -6.3 | -6.2 | -1.3 |
| Provision for credit losses | 11.7 | -3.2 | 12.4 | 2.9 | 0.8 | 3.0 | 5.3 | 1.9 |
| Depreciation and amortization expense | 3.5 | 3.7 | 3.8 | 3.9 | 3.8 | 3.8 | 4.4 | 3.2 |
| Investment securities amortization and accretion, net | 3.8 | 6.7 | 4.8 | 3.0 | 3.2 | 3.1 | 3.1 | 2.2 |
| Stock-based compensation expense | 2.6 | 2.4 | 1.8 | 1.9 | 1.7 | 1.5 | 2.0 | 0.8 |
| Amortization of core deposit intangible assets | 0.6 | 0.7 | 0.7 | 0.7 | 0.7 | 1.8 | 1.9 | 1.3 |
| Purchase accounting accretion, net | -0.3 | -0.7 | -1.3 | -1.5 | -2.3 | -2.8 | | |
| (Increase) decrease in other assets | -4.1 | 3.3 | -9.2 | -1.0 | -9.0 | 11.2 | 11.8 | -7.1 |
| Increase (decrease) in other liabilities | -1.8 | 0.0 | 2.6 | -0.3 | 0.9 | 1.2 | -1.3 | 1.8 |
| Net cash provided by operating activities | 105.2 | 142.7 | 18.2 | 32.9 | 64.3 | 58.3 | 57.4 | 15.9 |
| |
| Investing Activities | | | | | | | | |
| Proceeds from available-for-sale debt securities | 210.8 | 321.6 | 264.1 | 355.6 | 189.4 | 155.0 | 184.6 | |
| Purchase of available-for-sale debt securities | -95.4 | -758.8 | -433.4 | -339.3 | -232.2 | -170.5 | -220.2 | -111.2 |
| Purchase of held-to-maturity securities | 42.7 | | | | | | -11.0 | -64.4 |
| Net increase in loans | -579.4 | -211.7 | -124.5 | -70.7 | -243.8 | -187.7 | -103.7 | -94.8 |
| Purchase of Federal Home Loan Bank stock | -43.9 | -0.1 | -9.2 | -13.7 | -15.1 | -12.3 | | |
| Purchase of premises and equipment | -2.2 | -1.9 | -2.9 | -4.3 | -5.0 | -2.8 | -1.7 | -3.2 |
| Proceeds from the sale of other real estate owned | 0.3 | 0.5 | 0.1 | 0.6 | 0.1 | 0.8 | 0.7 | 2.8 |
| Net cash used in investing activities | -487.7 | -649.1 | -294.5 | -55.8 | -276.8 | -212.1 | -168.0 | -54.7 |
| |
| Financing Activities | | | | | | | | |
| Net decrease in deposits | 218.0 | 603.6 | 467.5 | 73.3 | 464.1 | 172.3 | 103.0 | 71.8 |
| Common stock repurchases | -10.2 | -10.1 | -9.7 | -20.8 | 0.0 | | | |
| Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings | -0.4 | -0.3 | -0.1 | -0.2 | -0.4 | -0.6 | -0.9 | -0.8 |
| Cash dividends paid on common stock | -23.5 | -21.1 | -19.8 | -18.6 | -17.2 | -14.3 | -12.4 | -9.8 |
| Finance lease payments | -0.2 | -0.2 | -0.1 | -0.1 | | | | |
| Net cash provided by financing activities | 237.3 | 581.2 | 346.4 | 31.6 | 176.5 | 169.1 | 118.8 | 57.5 |
| |
| Cash, cash equivalents, and restricted cash at beginning of period | | | | | | | | |
| Cash, cash equivalents and restricted cash at end of period | | | | | | | | |
| Supplemental information | | | | | | | | |
| Interest paid | 24.5 | 11.2 | 21.5 | 41.4 | 30.2 | 20.8 | 16.7 | 12.6 |
| Income taxes paid | 13.2 | 18.5 | 15.7 | 13.5 | 10.7 | 16.8 | 10.6 | 12.2 |