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Shareholders' Equity and Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Various Information | At December 31, 2023 and 2022, 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, 2023 |  | December 31, 2022
Outstanding performance units (maximum issuance) | 273,202 |  |  | 209,702 |
Outstanding RSU’s | 290,141 |  |  | 269,868 |
Outstanding options | 333,608 |  |  | 222,032 |
2018 Stock Incentive Plan | 732,427 |  |  | 342,157 |
Non-Management Director Plan | 130,162 |  |  | 55,878 |
2018 Employee Stock Purchase Plan | 447,655 |  |  | 515,941 |
Total | 2,207,195 |  |  | 1,615,578 |
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, 2020 | $ | 22,320 |  |  | $ | 19,308 |  |  | $ | (4,508) |  |  | $ | 37,120 |
Net change | (17,049) |  |  | (3,624) |  |  | 2,330 |  |  | (18,343) |
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) |
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:
| 2023 |  | 2022 |  | 2021
($ 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 | $ | 42,988 |  |  | $ | 10,833 |  |  | $ | 32,155 |  |  | $ | (200,030) |  |  | $ | (50,407) |  |  | $ | (149,623) |  |  | $ | (22,701) |  |  | $ | (5,652) |  |  | $ | (17,049) |
Reclassification of gain on sale of available-for-sale securities(a) | (601) |  |  | (151) |  |  | (450) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Reclassification of gain on held-to-maturity securities(a) | (3,483) |  |  | (878) |  |  | (2,605) |  |  | (3,605) |  |  | (909) |  |  | (2,696) |  |  | (4,672) |  |  | (1,048) |  |  | (3,624) |
Change in unrealized gain (loss) on cash flow hedges | (656) |  |  | (165) |  |  | (491) |  |  | 3,741 |  |  | 943 |  |  | 2,798 |  |  | 1,533 |  |  | 372 |  |  | 1,161 |
Reclassification of loss on cash flow hedges(b) | 945 |  |  | 237 |  |  | 708 |  |  | 551 |  |  | 139 |  |  | 412 |  |  | 1,543 |  |  | 374 |  |  | 1,169 |
Total other comprehensive income (loss) | $ | 39,193 |  |  | $ | 9,876 |  |  | $ | 29,317 |  |  | $ | (199,343) |  |  | $ | (50,234) |  |  | $ | (149,109) |  |  | $ | (24,297) |  |  | $ | (5,954) |  |  | $ | (18,343) |
(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:
($ in thousands) | 2023 |  | 2022 |  | 2021
Performance stock units | $ | 2,879 |  |  | $ | 2,391 |  |  | $ | 1,777 |
Restricted stock units | 5,014 |  |  | 4,156 |  |  | 3,109 |
Stock options | 1,609 |  |  | 916 |  |  | 396 |
Employee stock purchase plan | 644 |  |  | 543 |  |  | 735 |
Total share-based compensation expense | $ | 10,146 |  |  | $ | 8,006 |  |  | $ | 6,017 |
Outstanding Long Term Incentive Awards [Table Text Block] | Information related to the outstanding grants at December 31, 2023 is shown below:
($ in thousands, except per share data) | 2021 - 2023 Cycle |  | 2022 - 2024 Cycle |  | 2023 - 2025 Cycle
Shares issuable at target | 38,412 |  |  | 41,765 |  |  | 56,424 |
Maximum shares issuable | 76,824 |  |  | 83,530 |  |  | 112,848 |
Unrecognized compensation cost | $ | 77 |  |  | $ | 1,001 |  |  | $ | 2,340 |
Weighted average grant date fair value (per share) | $ | 47.16 |  |  | $ | 51.91 |  |  | $ | 62.19 |
| Maximum Shares Issuable
Outstanding at December 31, 2022 | 209,702 |
Granted | 112,848 |
Vested (issued 31,142 shares) | (49,348) |
Outstanding at December 31, 2023 | 273,202 |
Summary of Employee Stock Option and SSARs Activity | Following is a summary of stock option activity for 2023.
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term
Outstanding at December 31, 2022 | 222,032 |  |  | $ | 46.12 |  |  |
Granted | 122,161 |  |  | 54.46 |  |  |
Exercised | (909) |  |  | 45.28 |  |  |
Forfeited | (9,676) |  |  | 48.30 |  |  |
Outstanding at December 31, 2023 | 333,608 |  |  | $ | 49.11 |  |  | 8.2 years
Exercisable at December 31, 2023 | 53,208 |  |  | $ | 45.30 |  |  | 7.5 years
Summary of Restricted Stock Units Activity | A summary of the status of the Company’s RSU awards as of December 31, 2023 and changes during the year then ended is presented below.
|  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2022 |  | 269,868 |  |  | $ | 46.49 |
Granted |  | 107,353 |  |  | 50.46 |
Vested |  | (77,195) |  |  | 43.60 |
Forfeited |  | (9,885) |  |  | 47.65 |
Outstanding at December 31, 2023 |  | 290,141 |  |  | $ | 48.69 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following weighted average assumptions were used for grants issued during the year ended December 31, 2023.
| Weighted Average
Risk Free Interest Rate | 4.09%
Expected Dividend Yield | 1.84%
Expected Volatility | 34.74%
Expected Term (years) | 6.3
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.
($ in thousands) | 2023 |  | 2022 |  | 2021
Total fair value of awards vesting during the year | $ | 3,894 |  |  | $ | 3,888 |  |  | $ | 2,855 |
Unrecognized compensation cost | 8,438 |  |  | 8,507 |  |  | 4,622 |
Expected years to recognize unearned compensation | 1.7 years |  | 2.0 years |  | 1.9 years
Weighted average grant date fair value | $ | 50.46 |  |  | $ | 47.96 |  |  | $ | 44.01 |
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.
| 2023 |  | 2022 |  | 2021
Shares granted | 27,016 |  |  | 23,343 |  |  | 12,998 |
Weighted average grant date fair value | $ | 41.31 |  |  | $ | 42.17 |  |  | $ | 46.05 |

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