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Stock-Based Compensation Plans - Restricted Stock Awards (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expense	$ 0	$ 0
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expense	$ 1,600,000	$ 1,200,000
Restricted Stock Awards
Outstanding at beginning of period (in shares)	45,799
Granted (in shares)	59,091
Exchanged for common shares (in shares)	(32,661)
Outstanding at end of period (in shares)	72,229	45,799
Total unrecognized compensation cost	$ 1,600,000
Unrecognized cost, period for recognition (in years)	1 year 6 months
Weighted average grant date fair value (in USD per share)	$ 48.86
Restricted stock awards | 2009 Equity Compensation Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Restricted stock awards | 2009 Equity Compensation Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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