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Share-based Compensation and Other Employment Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation, Allocation of Recognized Period Costs
Total share-based compensation expense recognized for 2023, 2022, and 2021 is presented in the following table by its classification within total non-interest expense.
Years Ended December 31,
(in thousands)202320222021
Salaries and other personnel expense$30,610 $26,751 $26,957 
Other operating expense1,614 1,153 838 
Total share-based compensation expense included in non-interest expense$32,224 $27,904 $27,795 
Schedule of Stock Options Activity
A summary of stock option activity and changes during the years ended December 31, 2023, 2022, and 2021 is presented below.
Stock Options
202320222021
(in thousands, except per share data)QuantityWeighted-Average Exercise PriceQuantityWeighted-Average Exercise PriceQuantityWeighted-Average Exercise Price
Outstanding at beginning of year1,113 $23.51 1,478 $22.71 2,401 $22.47 
Options exercised(697)18.97 (365)20.27 (923)22.07 
Options forfeited/expired/canceled— — — — — — 
Options outstanding at end of year416 $31.13 1,113 $23.51 1,478 $22.71 
Options exercisable at end of year416 $31.13 1,113 $23.51 1,478 $22.71 
Schedule of Measuring Compensation Expense The fair value of performance share units, which include a market condition, was estimated on the date of grant using a Monte Carlo simulation model with the following weighted average assumptions:
202320222021
Risk-free interest rate4.38 %2.87 %2.87 %
Expected stock price volatility 48.3 57.2 56.1 
Simulation period2.9 years2.9 years2.9 years
Schedule of Restricted Stock Units Activity
A summary of restricted share units and performance share units outstanding and changes during the years ended December 31, 2023, 2022, and 2021 is presented below.
Restricted Share UnitsPerformance Share Units
(in thousands, except per share data)QuantityWeighted-Average Grant Date Fair ValueQuantityWeighted-Average Grant Date Fair Value
Outstanding at December 30, 20201,221 $34.50 439 $39.37 
Granted599 42.31 141 42.94 
Vested(482)37.05 (58)42.43 
Forfeited(93)31.41 — — 
Outstanding at December 31, 20211,245 37.00 522 37.59 
Granted608 48.14 29 54.76 
Vested(571)36.98 (45)38.86 
Forfeited(58)42.21 (34)43.06 
Outstanding at December 31, 20221,224 41.80 472 44.11 
Granted807 41.04 192 46.18 
Vested(654)38.47 (170)35.75 
Forfeited(84)45.18 — — 
Outstanding at December 31, 20231,293 $42.90 494 $47.16