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Shareholders' Equity and Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | At December 31, 2024 and 2023, the Company has reserved the following shares of its authorized but unissued common stock for possible future issuance in connection with the following:
| December 31,
| 2024 |  | 2023
Outstanding performance units (maximum issuance) | 363,070 |  |  | 273,202 |
Outstanding RSU’s | 297,122 |  |  | 290,141 |
Outstanding options | 510,812 |  |  | 333,608 |
2018 Stock Incentive Plan | 290,841 |  |  | 732,427 |
Non-Management Director Plan | 104,145 |  |  | 130,162 |
2018 Employee Stock Purchase Plan | 399,289 |  |  | 447,655 |
Total | 1,965,279 |  |  | 2,207,195 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table presents the changes in accumulated other comprehensive income (loss) after-tax by component:
($ in thousands) | Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities |  | Unamortized Gain (Loss) on Held-to-Maturity Securities |  | Net Unrealized Gain (Loss) on Cash Flow Hedges |  | Total
Balance, December 31, 2021 | $ | 5,271 |  |  | $ | 15,684 |  |  | $ | (2,178) |  |  | $ | 18,777 |
Net change | (149,623) |  |  | (2,696) |  |  | 3,210 |  |  | (149,109) |
Transfer from available-for-sale to held-to-maturity | (197) |  |  | 197 |  |  | — |  |  | — |
Balance, December 31, 2022 | $ | (144,549) |  |  | $ | 13,185 |  |  | $ | 1,032 |  |  | $ | (130,332) |
Net change | 31,705 |  |  | (2,605) |  |  | 217 |  |  | 29,317 |
Balance, December 31, 2023 | $ | (112,844) |  |  | $ | 10,580 |  |  | $ | 1,249 |  |  | $ | (101,015) |
Net change | (9,288) |  |  | (2,492) |  |  | (3,923) |  |  | (15,703) |
Balance, December 31, 2024 | $ | (122,132) |  |  | $ | 8,088 |  |  | $ | (2,674) |  |  | $ | (116,718) |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | The following table presents the pre-tax and after-tax changes in the components of other comprehensive income:
| 2024 |  | 2023 |  | 2022
($ in thousands) | Pre-tax |  | Tax effect |  | After-tax |  | Pre-tax |  | Tax effect |  | After-tax |  | Pre-tax |  | Tax effect |  | After-tax
Change in unrealized gain (loss) on available-for-sale securities | $ | (12,351) |  |  | $ | (3,063) |  |  | $ | (9,288) |  |  | $ | 42,988 |  |  | $ | 10,833 |  |  | $ | 32,155 |  |  | $ | (200,030) |  |  | $ | (50,407) |  |  | $ | (149,623) |
Reclassification of gain on sale of available-for-sale securities(a) | — |  |  | — |  |  | — |  |  | (601) |  |  | (151) |  |  | (450) |  |  | — |  |  | — |  |  | — |
Reclassification of gain on held-to-maturity securities(a) | (3,314) |  |  | (822) |  |  | (2,492) |  |  | (3,483) |  |  | (878) |  |  | (2,605) |  |  | (3,605) |  |  | (909) |  |  | (2,696) |
Change in unrealized gain (loss) on cash flow hedges | (6,949) |  |  | (1,723) |  |  | (5,226) |  |  | (656) |  |  | (165) |  |  | (491) |  |  | 3,741 |  |  | 943 |  |  | 2,798 |
Reclassification of loss on cash flow hedges(b) | 1,731 |  |  | 428 |  |  | 1,303 |  |  | 945 |  |  | 237 |  |  | 708 |  |  | 551 |  |  | 139 |  |  | 412 |
Total other comprehensive income (loss) | $ | (20,883) |  |  | $ | (5,180) |  |  | $ | (15,703) |  |  | $ | 39,193 |  |  | $ | 9,876 |  |  | $ | 29,317 |  |  | $ | (199,343) |  |  | $ | (50,234) |  |  | $ | (149,109) |
(a)The pre-tax amount is reported in noninterest income/expense in the Consolidated Statements of Income. (b)The pre-tax amount is reported in interest income/expense in the Consolidated Statements of Income.
Share-based Payment Arrangement, Cost by Plan [Table Text Block] | The following table summarizes share-based compensation expense:
| For the year ended December 31,
($ in thousands) | 2024 |  | 2023 |  | 2022
Performance stock units | $ | 2,898 |  |  | $ | 2,879 |  |  | $ | 2,391 |
Restricted stock units | 5,341 |  |  | 5,014 |  |  | 4,156 |
Stock options | 2,110 |  |  | 1,609 |  |  | 916 |
Employee stock purchase plan | 523 |  |  | 644 |  |  | 543 |
Total share-based compensation expense | $ | 10,872 |  |  | $ | 10,146 |  |  | $ | 8,006 |
Outstanding Long Term Incentive Awards [Table Text Block] | Information related to the outstanding grants at December 31, 2024 is shown below:
($ in thousands, except per share data) | 2022 - 2024 Cycle |  | 2023 - 2025 Cycle |  | 2024 - 2026 Cycle
Shares issuable at target | 41,765 |  |  | 56,424 |  |  | 83,346 |
Maximum shares issuable | 83,530 |  |  | 112,848 |  |  | 166,692 |
Unrecognized compensation cost | $ | 92 |  |  | $ | 767 |  |  | $ | 2,156 |
Weighted average grant date fair value (per share) | $ | 51.91 |  |  | $ | 62.19 |  |  | $ | 38.84 |
| Maximum Shares Issuable |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2023 | 273,202 |  |  | $ | 54.82 |
Granted | 166,692 |  |  | 38.84 |
Vested (issued 64,582 shares) | (76,824) |  |  | 47.16 |
Outstanding at December 31, 2024 | 363,070 |  |  | $ | 49.10 |
Summary of Employee Stock Option and SSARs Activity | Following is a summary of stock option activity for 2024.
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term
Outstanding at December 31, 2023 | 333,608 |  |  | $ | 49.11 |  |  |
Granted | 204,853 |  |  | 39.50 |  |  |
Exercised | (12,433) |  |  | 45.58 |  |  |
Forfeited | (15,216) |  |  | 45.84 |  |  |
Outstanding at December 31, 2024 | 510,812 |  |  | $ | 45.43 |  |  | 8.0 years
Exercisable at December 31, 2024 | 140,375 |  |  | $ | 46.02 |  |  | 6.6 years
Summary of Restricted Stock Units Activity | A summary of the status of the Company’s RSU awards as of December 31, 2024 and changes during the year then ended is presented below.
|  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2023 |  | 290,141 |  |  | $ | 48.69 |
Granted |  | 140,359 |  |  | 41.52 |
Vested |  | (116,886) |  |  | 47.22 |
Forfeited |  | (16,492) |  |  | 45.22 |
Outstanding at December 31, 2024 |  | 297,122 |  |  | $ | 46.07 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following weighted average assumptions were used for grants issued during the years ended December 31, 2024, 2023, and 2022.
| Weighted Average
| For the year ended December 31,
| 2024 |  | 2023 |  | 2022
Risk Free Interest Rate | 4.27% |  | 4.09% |  | 1.95%
Expected Dividend Yield | 2.53% |  | 1.84% |  | 1.74%
Expected Volatility | 35.79% |  | 34.74% |  | 34.54%
Expected Term (years) | 6.2 |  | 6.3 |  | 6.2
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | Various information related to the RSUs is shown below.
| At or for the year ended December 31,
($ in thousands except per unit data) | 2024 |  | 2023 |  | 2022
Total fair value of awards vesting during the year | $ | 4,919 |  |  | $ | 3,894 |  |  | $ | 3,888 |
Unrecognized compensation cost | 8,328 |  |  | 8,438 |  |  | 8,507 |
Expected years to recognize unearned compensation | 1.5 years |  | 1.7 years |  | 2.0 years
Weighted average grant date fair value per unit | $ | 41.52 |  |  | $ | 50.46 |  |  | $ | 47.96 |
Stock Plan for Non-Management Directors |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | Various information related to the Director Plan is shown below.
| At or for the year ended December 31,
| 2024 |  | 2023 |  | 2022
Shares granted | 28,993 |  |  | 27,016 |  |  | 23,343 |
Weighted average grant date fair value | $ | 41.10 |  |  | $ | 41.31 |  |  | $ | 42.17 |

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