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Stockholders' Equity and Stock Plans - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Cash dividends to common stockholders	$ 13,107	$ 12,506	$ 10,958
Cash dividends per common share (usd per share)	$ 0.94	$ 0.92	$ 0.80
Retained earnings	$ 239,868	$ 219,747
Stockholders' equity	$ 450,368	$ 358,253	$ 336,788	$ 316,407
Period used to determine amount available for payment of dividends based on restriction (in years)	3 years
Amount of retained earnings available for payment of dividends based on restriction	$ 6,200
Cash held	$ 6,700

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Dividends, Cash Dividend, Amount Retained Earnings Available for Dividend Payments Under Restriction

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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