Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2020	$ 982,276	$ 306	$ 689,390	$ 15,004	$ 356,414	$ (78,838)
Balance (in shares) at Dec. 31, 2020		37,291,480
Net income	40,996				40,996
Other comprehensive income (loss)	(15,506)			(15,506)
Deferred compensation plan			51			(51)
Deferred compensation plan (in shares)		7,911
Stock based compensation expenses	551		551
Vesting of incentive plans			(82)			82
Vesting of incentive plans (in shares)		6,124
Shares issued under stock option plan	8					8
Shares issued under stock option plan (in shares)		600
Restricted share issuance			(183)			183
Restricted share issuance (in shares)		13,708
Restricted share forfeitures	(118)		20			(138)
Restricted share forfeitures (in shares)		(5,779)
Shares repurchased	(1,078)					(1,078)
Shares repurchased (In Shares)		(39,200)
Common stock dividend payment	(8,943)				(8,943)
Balance at Mar. 31, 2021	998,186	$ 306	689,747	(502)	388,467	(79,832)
Balance (in shares) at Mar. 31, 2021		37,274,844
Balance at Dec. 31, 2020	982,276	$ 306	689,390	15,004	356,414	(78,838)
Balance (in shares) at Dec. 31, 2020		37,291,480
Net income	72,381
Other comprehensive income (loss)	(4,051)
Balance at Jun. 30, 2021	1,027,703	$ 306	689,785	10,953	410,153	(83,494)
Balance (in shares) at Jun. 30, 2021		37,177,605
Balance at Mar. 31, 2021	998,186	$ 306	689,747	(502)	388,467	(79,832)
Balance (in shares) at Mar. 31, 2021		37,274,844
Net income	31,385				31,385
Other comprehensive income (loss)	11,455			11,455
Deferred compensation plan			(26)			26
Stock based compensation expenses	656		656
Vesting of incentive plans			(291)			291
Vesting of incentive plans (in shares)		21,834
Restricted share issuance			(301)			301
Restricted share issuance (in shares)		22,550
Restricted share forfeitures	(507)					(507)
Restricted share forfeitures (in shares)		(15,257)
Shares repurchased	(3,773)					(3,773)
Shares repurchased (In Shares)		(126,366)
Common stock dividend payment	(9,699)				(9,699)
Balance at Jun. 30, 2021	1,027,703	$ 306	689,785	10,953	410,153	(83,494)
Balance (in shares) at Jun. 30, 2021		37,177,605
Balance at Dec. 31, 2021	1,023,496	$ 306	691,132	(3,428)	443,517	(108,031)
Balance (in shares) at Dec. 31, 2021		36,383,613
Net income	26,357				26,357
Other comprehensive income (loss)	(72,069)			(72,069)
Deferred compensation plan			(14)			14
Deferred compensation plan (in shares)		9,933
Stock based compensation expenses	760		760
Vesting of incentive plans	0		(246)			246
Vesting of incentive plans (in shares)		5,660
Restricted share issuance	(0)		(351)			351
Restricted share issuance (in shares)		19,936
Restricted share forfeitures	(216)		69			(285)
Restricted share forfeitures (in shares)		(5,398)
Shares repurchased	(24,245)					(24,245)
Shares repurchased (In Shares)		(793,166)
Common stock dividend payment	(10,787)				(10,787)
Balance at Mar. 31, 2022	943,296	$ 306	691,350	(75,497)	459,087	(131,950)
Balance (in shares) at Mar. 31, 2022		35,620,578
Balance at Dec. 31, 2021	1,023,496	$ 306	691,132	(3,428)	443,517	(108,031)
Balance (in shares) at Dec. 31, 2021		36,383,613
Net income	48,717
Other comprehensive income (loss)	(123,326)
Balance at Jun. 30, 2022	901,147	$ 306	690,905	(126,754)	470,779	(134,089)
Balance (in shares) at Jun. 30, 2022		35,555,478
Balance at Mar. 31, 2022	943,296	$ 306	691,350	(75,497)	459,087	(131,950)
Balance (in shares) at Mar. 31, 2022		35,620,578
Net income	22,360				22,360
Other comprehensive income (loss)	(51,257)			(51,257)
Deferred compensation plan			(14)			14
Stock based compensation expenses	157		157
Vesting of incentive plans			(167)			167
Vesting of incentive plans (in shares)		5,547
Restricted share issuance			(421)			421
Restricted share issuance (in shares)		24,256
Restricted share forfeitures	(118)					(118)
Restricted share forfeitures (in shares)		4,033
Shares repurchased	(2,623)					(2,623)
Shares repurchased (In Shares)		(90,870)
Common stock dividend payment	(10,668)				(10,668)
Balance at Jun. 30, 2022	$ 901,147	$ 306	$ 690,905	$ (126,754)	$ 470,779	$ (134,089)
Balance (in shares) at Jun. 30, 2022		35,555,478