Stock Compensation Plans - Stock option activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, January 1, 2021 \| shares	35,661
Option Outstanding, Exercised \| shares	0
Options outstanding, September 30, 2021 \| shares	35,661
Exercisable at September 30, 2021 \| shares	35,661
Weighted Average Exercise Price, Options outstanding, January 1, 2021 \| $ / shares	$ 21.72
Weighted Average Exercise Price, Exercised \| $ / shares	0
Weighted Average Exercise Price, Options outstanding, September 30, 2021 \| $ / shares	21.72
Weighted Average Exercise Price, Exercisable at September 30, 2021 \| $ / shares	$ 21.72
Weighted Average Remaining Contractual Term (In years), outstanding, September 30, 2021	4 years 1 month 2 days
Weighted Average Remaining Contractual Terms (In years), Exercisable at September 30, 2021	4 years 1 month 2 days
Aggregate Intrinsic Value, outstanding, September 30, 2021 \| $	$ 310,597
Aggregate Intrinsic Value, Exercisable at September 30, 2021 \| $	$ 310,597

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

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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