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Share-Based Compensation - Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Restricted Stock Units  
RSU Activity  
Outstanding at the beginning of the period (in shares) 948,213
Assumed restricted stock units from ACBI merger (in shares) 55,736
Granted (in shares) 333,116
Vested (in shares) (383,352)
Forfeited (in shares) (7,287)
Outstanding at the end of the period (in shares) 946,426
Weighted-Average Grant-Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 67.01
Assumed restricted stock units from ACBI merger (in dollars per share) | $ / shares 87.94
Granted (in dollars per share) | $ / shares 82.34
Vested (in dollars per share) | $ / shares 66.25
Forfeited (in dollars per share) | $ / shares 84.07
Outstanding at the end of the period (in dollars per share) | $ / shares $ 73.81
Additional disclosures  
Options vested (in shares) 54,687
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ $ 33.6
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 2 months 12 days
Total fair value of shares vested during the period | $ $ 29.1
Performance based restricted stock units  
Share-Based Compensation  
Performance period 3 years
Other Performance based restricted stock units | Minimum  
Share-Based Compensation  
Performance period 1 year
Other Performance based restricted stock units | Maximum  
Share-Based Compensation  
Performance period 2 years
Timed based restricted stock units | Minimum  
Share-Based Compensation  
Vesting period 2 years
Timed based restricted stock units | Maximum  
Share-Based Compensation  
Vesting period 4 years
Non-employee directors | Restricted Stock Units  
Share-Based Compensation  
Vesting period 12 months
2021 and 2022 LTI performance-based RSU grants | Restricted Stock Units  
Share-Based Compensation  
Vesting period 3 years
Additional disclosures  
Additional shares authorized 104,160