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Share-Based Compensation - Information for Restricted Stock Units (Details) - Restricted stock units
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Shares  
Nonvested, beginning of period (in shares) | shares 995,049
Assumed upon Boston Private acquisition (in shares) | shares 67,542
Granted (in shares) | shares 311,760
Vested (in shares) | shares (291,093)
Forfeited (in shares) | shares (67,112)
Nonvested, end of period (in shares) | shares 1,016,146
Weighted Average Grant Date Fair Value  
Nonvested, beginning of period (usd per share) | $ / shares $ 227.12
Assumed upon Boston Private acquisition | $ / shares 363.54
Granted (usd per share) | $ / shares 554.32
Vested (usd per share) | $ / shares 235.90
Forfeited (usd per share) | $ / shares 305.72
Nonvested, end of period (usd per share) | $ / shares $ 328.87