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Retirement and Share-based Compensation Plans (Share-based Compensation Expense By Plan) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESOP, compensation expense $ 3,377 $ 2,908 $ 2,547
Compensation expense 27,525 11,819 10,028
Employee Incentive Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 22,886 7,855 6,559
Director Equity Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 1,262 $ 1,056 $ 922