Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Retained earnings	Accumulated other comprehensive income (loss)
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2020		21,796,904
Beginning balance at Dec. 31, 2020	$ 717,750	$ 278,505	$ 403,888	$ 35,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,663		29,663
Share-based compensation expense	810	$ 810
Common stock issued - Option exercise; stock grants (in shares)		188,257
Common stock issued - Option exercise; stock grants	1,849	$ 1,849
Other comprehensive income (loss)	(15,548)			(15,548)
Dividends declared on common stock	(5,534)		(5,534)
Common stock repurchased (in shares)		(624,647)
Common stock repurchased	(27,527)	$ (11,222)	(16,305)
Common stock shares outstanding, ending balance (in shares) at Mar. 31, 2021		21,360,514
Ending balance at Mar. 31, 2021	$ 701,463	$ 269,942	411,712	19,809
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2021	20,085,336	20,085,336
Beginning balance at Dec. 31, 2021	$ 715,339	$ 249,856	444,343	21,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,951		19,951
Share-based compensation expense	1,076	$ 1,076
Common stock issued - Option exercise; stock grants (in shares)		104,840
Common stock issued - Option exercise; stock grants	0	$ 0
Other comprehensive income (loss)	(52,069)			(52,069)
Dividends declared on common stock	(7,164)		(7,164)
Common stock repurchased (in shares)		(1,489,640)
Common stock repurchased	$ (75,902)	$ (27,214)	(48,688)
Common stock shares outstanding, ending balance (in shares) at Mar. 31, 2022	18,700,536	18,700,536
Ending balance at Mar. 31, 2022	$ 601,231	$ 223,718	$ 408,442	$ (30,929)