Summary of Significant Accounting Policies - Common Shares Outstanding (Details) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	4,243,716	4,235,533	4,217,596
Issuance of shares in acquisition (in shares)			11,145
Vesting of restricted stock unit awards (in shares)	14,244	10,290	7,604
Shares withheld to cover taxes upon vesting of restricted stock unit awards (in shares)	(3,043)	(2,107)	(883)
Other (in shares)			71
Ending balance (in shares)	4,355,001	4,243,716	4,235,533
Common Stock \| At the Market Offerings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares sold under at-the-market offering program (in shares)	97,623
Performance share unit awards
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of performance share unit awards (in shares)	2,461

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number of new stock issued during the period.

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Number of shares of stock issued attributable to transactions classified as other.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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