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Shareholders' Equity and Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | At December 31, 2025 and 2024, 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,
| 2025 |  | 2024
Outstanding performance units (maximum issuance) | 407,124 |  |  | 363,070 |
Outstanding RSU’s | 320,777 |  |  | 297,122 |
Outstanding options | 597,997 |  |  | 510,812 |
2018 Stock Incentive Plan | 637,686 |  |  | 290,841 |
Non-Management Director Plan | 76,272 |  |  | 104,145 |
2018 Employee Stock Purchase Plan | 322,494 |  |  | 399,289 |
Total | 2,362,350 |  |  | 1,965,279 |
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, 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) |
Net change | 60,126 |  |  | (2,447) |  |  | 4,452 |  |  | 62,131 |
Balance, December 31, 2025 | $ | (62,006) |  |  | $ | 5,641 |  |  | $ | 1,778 |  |  | $ | (54,587) |
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:
| 2025 |  | 2024 |  | 2023
($ 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 | $ | 80,004 |  |  | $ | 19,841 |  |  | $ | 60,163 |  |  | $ | (12,351) |  |  | $ | (3,063) |  |  | $ | (9,288) |  |  | $ | 42,988 |  |  | $ | 10,833 |  |  | $ | 32,155 |
Reclassification of gain on sale of available-for-sale securities(a) | (49) |  |  | (12) |  |  | (37) |  |  | — |  |  | — |  |  | — |  |  | (601) |  |  | (151) |  |  | (450) |
Reclassification of gain on held-to-maturity securities(a) | (3,254) |  |  | (807) |  |  | (2,447) |  |  | (3,314) |  |  | (822) |  |  | (2,492) |  |  | (3,483) |  |  | (878) |  |  | (2,605) |
Change in unrealized gain (loss) on cash flow hedges | 4,825 |  |  | 1,197 |  |  | 3,628 |  |  | (6,949) |  |  | (1,723) |  |  | (5,226) |  |  | (656) |  |  | (165) |  |  | (491) |
Reclassification of loss on cash flow hedges(b) | 1,095 |  |  | 271 |  |  | 824 |  |  | 1,731 |  |  | 428 |  |  | 1,303 |  |  | 945 |  |  | 237 |  |  | 708 |
Total other comprehensive income (loss) | $ | 82,621 |  |  | $ | 20,490 |  |  | $ | 62,131 |  |  | $ | (20,883) |  |  | $ | (5,180) |  |  | $ | (15,703) |  |  | $ | 39,193 |  |  | $ | 9,876 |  |  | $ | 29,317 |
(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 stock-based compensation expense:
| For the year ended December 31,
($ in thousands) | 2025 |  | 2024 |  | 2023
Performance stock units | $ | 4,510 |  |  | $ | 2,898 |  |  | $ | 2,879 |
Restricted stock units | 6,004 |  |  | 5,341 |  |  | 5,014 |
Stock options | 2,244 |  |  | 2,110 |  |  | 1,609 |
Employee stock purchase plan | 733 |  |  | 523 |  |  | 644 |
Total stock-based compensation expense | $ | 13,491 |  |  | $ | 10,872 |  |  | $ | 10,146 |
Outstanding Long Term Incentive Awards [Table Text Block] | The following tables present information related to the outstanding performance stock units at December 31, 2025:
($ in thousands, except per share data) | 2023-2025 Cycle |  | 2024-2026 Cycle |  | 2025-2027 Cycle
Shares issuable at target | 56,424 |  |  | 83,346 |  |  | 63,792 |
Maximum shares issuable | 112,848 |  |  | 166,692 |  |  | 127,584 |
Unrecognized compensation cost | $ | — |  |  | $ | 1,078 |  |  | $ | 2,608 |
Weighted average grant date fair value (per share) | $ | 62.19 |  |  | $ | 38.84 |  |  | $ | 61.33 |
| Maximum Shares Issuable |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2024 | 363,070 |  |  | $ | 49.10 |
Granted | 127,584 |  |  | 61.33 |
Vested (issued 75,385 shares) | (83,530) |  |  | 51.91 |
Outstanding at December 31, 2025 | 407,124 |  |  | $ | 52.36 |
Summary of Employee Stock Option and SSARs Activity | The following table is a summary of stock option activity for 2025:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term
Outstanding at December 31, 2024 | 510,812 |  |  | $ | 45.43 |  |  |
Granted | 118,779 |  |  | 57.17 |  |  |
Exercised | (21,055) |  |  | 45.56 |  |  |
Forfeited | (10,539) |  |  | 49.01 |  |  |
Outstanding at December 31, 2025 | 597,997 |  |  | $ | 47.69 |  |  | 7.4 years
Exercisable at December 31, 2025 | 240,328 |  |  | $ | 46.39 |  |  | 6.2 years
Summary of Restricted Stock Units Activity | The following table presents a summary of the status of the Company’s RSU awards as of December 31, 2025 and changes during the year then ended:
|  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2024 |  | 297,122 |  |  | $ | 46.07 |
Granted |  | 138,032 |  |  | 56.22 |
Vested |  | (101,782) |  |  | 45.79 |
Forfeited |  | (12,595) |  |  | 51.59 |
Outstanding at December 31, 2025 |  | 320,777 |  |  | $ | 50.31 |
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, 2025, 2024, and 2023.
| Weighted Average
| For the year ended December 31,
| 2025 |  | 2024 |  | 2023
Risk Free Interest Rate | 4.08% |  | 4.27% |  | 4.09%
Expected Dividend Yield | 2.03% |  | 2.53% |  | 1.84%
Expected Volatility | 37.26% |  | 35.79% |  | 34.74%
Expected Term (years) | 6.2 |  | 6.2 |  | 6.3
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | The following table presents various information related to the RSUs:
| At or for the year ended December 31,
($ in thousands except per unit data) | 2025 |  | 2024 |  | 2023
Total fair value of awards vesting during the year | $ | 5,839 |  |  | $ | 4,919 |  |  | $ | 3,894 |
Unrecognized compensation cost | 9,385 |  |  | 8,328 |  |  | 8,438 |
Expected years to recognize unearned compensation | 2.0 years |  | 1.5 years |  | 1.7 years
Weighted average grant date fair value per unit | $ | 56.22 |  |  | $ | 41.52 |  |  | $ | 50.46 |
Stock Plan for Non-Management Directors |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | The following table presents various information related to the Stock Plan for Non-Management Directors:.
| At or for the year ended December 31,
| 2025 |  | 2024 |  | 2023
Shares granted | 18,118 |  |  | 28,993 |  |  | 27,016 |
Weighted average grant date fair value | $ | 60.51 |  |  | $ | 41.10 |  |  | $ | 41.31 |

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