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Share-Based Payment Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Option Activity |
Options |  | Number of Shares |  |  | Weighted- Average Exercise Price ($) |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value ($000) |
Outstanding at January 1, 2019 |  |  | 46,685 |  |  | $ |  | 31.88 |  |  |  | 2.6 |  |  | $ |  | 164 |
Former MidSouth options converted at acquisition |  |  | 20,530 |  |  |  |  | 46.76 |  |  |  |  |  |  |  |  | — |
Exercised/Released |  |  | (23,365 | ) |  |  |  | 33.06 |  |  |  |  |  |  |  |  | 180 |
Cancelled/Forfeited |  |  | — |  |  |  |  | — |  |  |  |  |  |  |  |  | — |
Expired |  |  | (15,305 | ) |  |  |  | 45.85 |  |  |  |  |  |  |  |  | 6 |
Outstanding at December 31, 2019 |  |  | 28,545 |  |  | $ |  | 34.11 |  |  |  | 2.2 |  |  | $ |  | 296 |
Exercisable at December 31, 2019 |  |  | 28,545 |  |  | $ |  | 34.11 |  |  |  | 2.2 |  |  | $ |  | 296 |
Summary of Nonvested Restricted and Performance Shares |
|  |  |  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value ($) |
Nonvested at January 1, 2019 |  |  |  |  | 1,494,041 |  |  | $ |  | 39.89 |
Granted |  |  |  |  | 694,377 |  |  |  |  | 39.85 |
Vested |  |  |  |  | (525,166 | ) |  |  |  | 38.20 |
Cancelled/Forfeited |  |  |  |  | (66,994 | ) |  |  |  | 39.88 |
Nonvested at December 31, 2019 |  |  |  |  | 1,596,258 |  |  | $ |  | 40.43 |

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