Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance (in shares) at Dec. 31, 2020	23,790,589
Balance at Dec. 31, 2020	$ 2,379	$ 105,547	$ 295,622	$ 3,570	$ 407,118
Net income			11,267		11,267
Other comprehensive income (loss)				(4,395)	(4,395)
Repurchase of common stock (in shares)	(107,887)
Repurchase of common stock	$ (11)	(1,989)			(2,000)
Shares withheld upon the vesting and conversion of RSUs (in shares)	(16,918)
Shares withheld upon the vesting and conversion of RSUs	$ (2)	(318)			(320)
Common stock issued under stock compensation plans (in shares)	94,627
Common stock issued under stock compensation plans	$ 10	152			162
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	22,341
Common stock issued under dividend reinvestment and stock purchase plan	$ 2	416			418
Stock-based compensation		390			390
Cash dividends declared			(4,518)		(4,518)
Balance (in shares) at Mar. 31, 2021	23,782,752
Balance at Mar. 31, 2021	$ 2,378	104,198	302,371	(825)	408,122
Balance (in shares) at Dec. 31, 2020	23,790,589
Balance at Dec. 31, 2020	$ 2,379	105,547	295,622	3,570	407,118
Net income					34,077
Other comprehensive income (loss)					(3,202)
Balance (in shares) at Sep. 30, 2021	23,606,212
Balance at Sep. 30, 2021	$ 2,361	101,197	315,957	368	419,883
Balance (in shares) at Mar. 31, 2021	23,782,752
Balance at Mar. 31, 2021	$ 2,378	104,198	302,371	(825)	408,122
Net income			11,388		11,388
Other comprehensive income (loss)				3,207	3,207
Repurchase of common stock (in shares)	(92,533)
Repurchase of common stock	$ (9)	(2,091)			(2,100)
Shares withheld upon the vesting and conversion of RSUs (in shares)	(1,431)
Shares withheld upon the vesting and conversion of RSUs		(31)			(31)
Common stock issued under stock compensation plans (in shares)	6,229
Common stock issued under stock compensation plans	$ 1	35			36
Stock-based compensation		525			525
Cash dividends declared			(4,503)		(4,503)
Balance (in shares) at Jun. 30, 2021	23,695,017
Balance at Jun. 30, 2021	$ 2,370	102,636	309,256	2,382	416,644
Net income			11,422		11,422
Other comprehensive income (loss)				(2,014)	(2,014)
Repurchase of common stock (in shares)	(100,845)
Repurchase of common stock	$ (10)	(2,190)			(2,200)
Shares withheld upon the vesting and conversion of RSUs (in shares)	(133)
Shares withheld upon the vesting and conversion of RSUs		(3)			(3)
Common stock issued under stock compensation plans (in shares)	2,207
Common stock issued under stock compensation plans		37			37
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	9,966
Common stock issued under dividend reinvestment and stock purchase plan	$ 1	203			204
Stock-based compensation		514			514
Cash dividends declared			(4,721)		(4,721)
Balance (in shares) at Sep. 30, 2021	23,606,212
Balance at Sep. 30, 2021	$ 2,361	101,197	315,957	368	419,883
Balance (in shares) at Dec. 31, 2021	23,240,596
Balance at Dec. 31, 2021	$ 2,324	93,480	320,321	(2,313)	413,812
Net income			12,083		12,083
Other comprehensive income (loss)				(27,684)	(27,684)
Repurchase of common stock (in shares)	(202,886)
Repurchase of common stock	$ (20)	(4,480)			(4,500)
Shares withheld upon the vesting and conversion of RSUs (in shares)	(25,628)
Shares withheld upon the vesting and conversion of RSUs	$ (3)	(542)			(545)
Common stock issued under stock compensation plans (in shares)	75,483
Common stock issued under stock compensation plans	$ 8	8			16
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	18,505
Common stock issued under dividend reinvestment and stock purchase plan	$ 2	380			382
Stock-based compensation		516			516
Cash dividends declared			(4,619)		(4,619)
Balance (in shares) at Mar. 31, 2022	23,106,070
Balance at Mar. 31, 2022	$ 2,311	89,362	327,785	(29,997)	389,461
Balance (in shares) at Dec. 31, 2021	23,240,596
Balance at Dec. 31, 2021	$ 2,324	93,480	320,321	(2,313)	413,812
Net income					37,028
Other comprehensive income (loss)				(65,380)	(65,380)
Balance (in shares) at Sep. 30, 2022	22,644,626
Balance at Sep. 30, 2022	$ 2,264	81,470	343,406	(67,693)	359,447
Balance (in shares) at Mar. 31, 2022	23,106,070
Balance at Mar. 31, 2022	$ 2,311	89,362	327,785	(29,997)	389,461
Net income			12,481		12,481
Other comprehensive income (loss)				(16,231)	(16,231)
Repurchase of common stock (in shares)	(286,011)
Repurchase of common stock	$ (29)	(5,260)			(5,289)
Shares withheld upon the vesting and conversion of RSUs (in shares)	(618)
Shares withheld upon the vesting and conversion of RSUs		(12)			(12)
Common stock issued under stock compensation plans (in shares)	21,075
Common stock issued under stock compensation plans	$ 2	13			15
Stock-based compensation		600			600
Cash dividends declared			(4,569)		(4,569)
Balance (in shares) at Jun. 30, 2022	22,840,516
Balance at Jun. 30, 2022	$ 2,284	84,703	335,697	(46,228)	376,456
Net income			12,464		12,464
Other comprehensive income (loss)				(21,465)	(21,465)
Repurchase of common stock (in shares)	(209,579)
Repurchase of common stock	$ (21)	(4,079)			(4,100)
Common stock issued under stock compensation plans (in shares)	899
Common stock issued under stock compensation plans		16			16
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	12,790
Common stock issued under dividend reinvestment and stock purchase plan	$ 1	217			218
Stock-based compensation		613			613
Cash dividends declared			(4,755)		(4,755)
Balance (in shares) at Sep. 30, 2022	22,644,626
Balance at Sep. 30, 2022	$ 2,264	$ 81,470	$ 343,406	$ (67,693)	$ 359,447