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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cumulative effect of change in accounting principle, taxes	$ 8,380	$ 8,454	$ 10,065
Unrealized loss on investment, taxes	247	43	0
Adjustment to postretirement benefit plans, taxes	$ (324)	$ 22	$ 0
Common stock, dividends per share, paid (usd per share)	$ 1.28	$ 1.2	$ 1.12
Cumulative Effect, Period of Adoption, Adjustment
Cumulative effect of change in accounting principle, taxes		$ 33	$ 1,507

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