Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Common stock Class A Common Stock	Common stock Class B Common Stock	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2020	$ 567,850	$ 310,619			$ 235,724	$ 21,507
Beginning balance (in shares) at Dec. 31, 2020			41,344,689	1,107,757
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	39,427				39,427
Other comprehensive loss	(12,379)					(12,379)
Issuance of restricted stock (in shares)			292,216
Tax withholding related to vesting of restricted stock and other	(11,287)	(11,287)
Employee stock purchase program	296	296
Employee stock purchase program (Shares)			5,686
Stock option exercises	1,213	1,213
Stock option exercises (in shares)			200,996
Stock option based compensation expense	344	344
Restricted stock expense	4,670	4,670
Non-voting common stock converted to voting common stock in private sale (Shares)			415,504	(415,504)
Transfer from retained earnings to other assets for pro rata portion of equity method investee stock compensation expense	1,508				1,508
Cash dividends	(1,282)				(1,282)
Ending balance at Mar. 31, 2021	590,360	305,855			275,377	9,128
Ending balance (in shares) at Mar. 31, 2021			42,259,091	692,253
Beginning balance at Dec. 31, 2021	715,133	312,294			400,893	1,946
Beginning balance (in shares) at Dec. 31, 2021			43,494,046	125,024
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,509				34,509
Other comprehensive loss	(38,452)					(38,452)
Issuance of restricted stock (in shares)			95,537
Tax withholding related to vesting of restricted stock and other	(2,894)	(2,894)
Employee stock purchase program	534	534
Employee stock purchase program (Shares)			11,119
Stock option exercises	719	719
Stock option exercises (in shares)			61,934
Stock option based compensation expense	391	391
Restricted stock expense	4,563	4,563
Non-voting common stock converted to voting common stock in private sale (Shares)			125,024	(125,024)
Transfer from retained earnings to other assets for pro rata portion of equity method investee stock compensation expense	136				136
Cash dividends	(1,312)				(1,312)
Ending balance at Mar. 31, 2022	$ 713,327	$ 315,607			$ 434,226	$ (36,506)
Ending balance (in shares) at Mar. 31, 2022			43,787,660