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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cumulative effect of change in accounting principle, taxes	$ 8,369	$ 8,380	$ 8,454
Unrealized gain (loss) on investment, taxes	68	247	43
Adjustment to pension benefit plans, taxes	$ 264	$ (324)	$ 22
Common stock, dividends per share, paid (usd per share)	$ 1.36	$ 1.28	$ 1.20
Cumulative Effect, Period of Adoption, Adjustment
Cumulative effect of change in accounting principle, taxes			$ 33

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