Share-Based Compensation - Stock Option Information Related to Equity Incentive Plan (Details)	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares
Options
Outstanding, beginning of period (in shares) \| shares	559,001
Assumed upon Boston Private acquisition (in shares) \| shares	28,724
Granted (in shares) \| shares	59,981
Exercised (in shares) \| shares	(169,045)
Forfeited (in shares) \| shares	(3,035)
Outstanding, end of period (in shares) \| shares	475,626
Vested and expected to vest (in shares) \| shares	448,844
Exercisable (in shares) \| shares	207,472
Weighted average exercise price
Outstanding, beginning of period (usd per share)	$ 191.29
Assumed upon Boston Private acquisition (usd per share)	330.75
Granted (usd per share)	569.14
Exercised (usd per share)	152.00
Forfeited (usd per share)	278.80
Outstanding, end of period (usd per share)	260.77
Vested and expected to vest (usd per share)	255.96
Exercisable (usd per share)	$ 201.61
Weighted Average Remaining Contractual Life in Years
Outstanding (in years)	4 years 3 months 14 days
Vested and expected to vest (in years)	4 years 1 month 28 days
Exercisable (in years)	3 years
Aggregate Intrinsic Value of In-The-Money Options
Outstanding \| $	$ 199,397,510
Vested and expected to vest \| $	190,270,540
Exercisable \| $	$ 98,888,120
Closing stock price	$ 678.24

Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Gross number of share options (or share units) granted during the period.

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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