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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends per common share (usd per share)			$ 0.94	$ 0.92	$ 0.80
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13	Accounting Standards Update 2016-13			Accounting Standards Update 2016-13

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Indicates amendment to accounting standards.

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