Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Voting and Nonvoting Common Stock	Common Stock Voting and Nonvoting Common Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2020	$ 330,944			$ 221,408	$ 126,732		$ (17,196)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,114				48,114
Other comprehensive income (loss)	6,157						6,157
Cash dividends declared	(2,415)				(2,415)
Repurchased shares of common stock (502,525)	(4,436)			(4,436)
Recognition of the fair value of share-based compensation	2,393			2,393
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units	21			21
Common stock redeemed for the net settlement of share-based awards	(440)			(440)
Balance at Dec. 31, 2021	380,338			218,946	172,431		(11,039)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,541				35,541
Other comprehensive income (loss)	(22,597)						(22,597)
Cash dividends declared	(2,297)				(2,297)
Repurchased shares of common stock (502,525)	(27,780)			(27,780)
Recognition of the fair value of share-based compensation	2,035			2,035
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units	21			21
Common stock redeemed for the net settlement of share-based awards	(287)			(287)
Balance at Dec. 31, 2022	364,974	$ (4,491)		192,935	205,675	$ (4,491)	(33,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings	205,675
Net income	8,417				8,417
Other comprehensive income (loss)	4,261						4,261
Cash dividends declared	(2,131)				(2,131)
Repurchased shares of common stock (502,525)	(9,248)			(9,248)
Excise Tax, Repurchased, Common Stock	(92)		$ (92)
Recognition of the fair value of share-based compensation	1,258			1,258
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units	9			9
Common stock redeemed for the net settlement of share-based awards	(162)			(162)
Balance at Dec. 31, 2023	362,795			$ 184,700	$ 207,470		$ (29,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings	$ 207,470