CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Total
Balance at Dec. 31, 2020	$ 57,551	$ 377,452	$ 128,453	$ 17,708	$ 581,164
Balance, shares at Dec. 31, 2020	57,550,629
Net income			25,965		25,965
Common stock issued from option exercises, net of tax benefits	$ 61	404			465
Common stock issued from option exercises, net of tax benefits, shares	61,500
Common stock issued from restricted units, net of tax benefits	$ 230	(230)
Common stock issued from restricted units, net of tax benefits, shares	230,212
Stock-based compensation		2,261			2,261
Common stock repurchases	$ (594)	(9,406)			(10,000)
Common stock repurchases, shares	(594,428)
Other comprehensive loss net of reclassification adjustments and tax				(3,091)	(3,091)
Balance at Mar. 31, 2021	$ 57,248	370,481	154,418	14,617	596,764
Balance (in shares) at Mar. 31, 2021	57,247,913
Balance at Dec. 31, 2020	$ 57,551	377,452	128,453	17,708	581,164
Balance, shares at Dec. 31, 2020	57,550,629
Net income					55,400
Other comprehensive loss net of reclassification adjustments and tax					(3,151)
Balance at Jun. 30, 2021	$ 57,458	363,241	183,853	14,557	619,109
Balance (in shares) at Jun. 30, 2021	57,458,287
Balance at Mar. 31, 2021	$ 57,248	370,481	154,418	14,617	596,764
Balance, shares at Mar. 31, 2021	57,247,913
Net income			29,435		29,435
Common stock issued from option exercises, net of tax benefits	$ 217	547			764
Common stock issued from option exercises, net of tax benefits, shares	217,368
Common stock issued from restricted units, net of tax benefits	$ 442	(442)
Common stock issued from restricted units, net of tax benefits, shares	442,321
Stock-based compensation		2,206			2,206
Common stock repurchases	$ (449)	(9,551)			(10,000)
Common stock repurchases, shares	(449,315)
Other comprehensive loss net of reclassification adjustments and tax				(60)	(60)
Balance at Jun. 30, 2021	$ 57,458	363,241	183,853	14,557	619,109
Balance (in shares) at Jun. 30, 2021	57,458,287
Balance at Dec. 31, 2021	$ 57,371	349,686	239,106	6,291	$ 652,454
Balance, shares at Dec. 31, 2021	57,370,563				57,370,563
Net income			28,966		$ 28,966
Common stock issued from option exercises, net of tax benefits	$ 27	57			84
Common stock issued from option exercises, net of tax benefits, shares	27,818
Common stock issued from restricted units, net of tax benefits	$ 284	(284)
Common stock issued from restricted units, net of tax benefits, shares	284,040
Stock-based compensation		1,618			1,618
Common stock repurchases	$ (527)	(14,473)			(15,000)
Common stock repurchases, shares	(527,393)
Other comprehensive loss net of reclassification adjustments and tax				(15,827)	(15,827)
Balance at Mar. 31, 2022	$ 57,155	336,604	268,072	(9,536)	652,295
Balance (in shares) at Mar. 31, 2022	57,155,028
Balance at Dec. 31, 2021	$ 57,371	349,686	239,106	6,291	$ 652,454
Balance, shares at Dec. 31, 2021	57,370,563				57,370,563
Net income					$ 59,368
Common stock repurchases, shares					(1,105,319)
Other comprehensive loss net of reclassification adjustments and tax					$ (28,868)
Balance at Jun. 30, 2022	$ 56,865	323,774	298,474	(22,577)	$ 656,536
Balance (in shares) at Jun. 30, 2022	56,865,494				56,865,494
Balance at Mar. 31, 2022	$ 57,155	336,604	268,072	(9,536)	$ 652,295
Balance, shares at Mar. 31, 2022	57,155,028
Net income			30,402		30,402
Common stock issued from option exercises, net of tax benefits	$ 7	71			78
Common stock issued from option exercises, net of tax benefits, shares	7,500
Common stock issued from restricted units, net of tax benefits	$ 281	(281)
Common stock issued from restricted units, net of tax benefits, shares	280,892
Stock-based compensation		1,802			1,802
Common stock repurchases	$ (578)	(14,422)			$ (15,000)
Common stock repurchases, shares	(577,926)				(577,926)
Other comprehensive loss net of reclassification adjustments and tax				(13,041)	$ (13,041)
Balance at Jun. 30, 2022	$ 56,865	$ 323,774	$ 298,474	$ (22,577)	$ 656,536
Balance (in shares) at Jun. 30, 2022	56,865,494				56,865,494