Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member] As Reported [Member]	Common Stock [Member]	Surplus [Member] As Reported [Member]	Surplus [Member]	Retained Earnings [Member] As Reported [Member]	Retained Earnings [Member] Impact Of Adopting ASU 2016-13 [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member] As Reported [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	As Reported [Member]	Impact Of Adopting ASU 2016-13 [Member]	Total
Balance (in shares) at Dec. 31, 2018		25,422,740
Balance at Dec. 31, 2018		$ 2,542		$ 145,163			$ 249,922		$ (9,440)			$ 388,187
Net income							10,841					10,841
Other comprehensive income (loss)									4,862			4,862
Repurchase of common stock (in shares)		(674,800)
Repurchase of common stock		$ (67)		(15,264)								(15,331)
Shares withheld upon the vesting and conversion of RSUs (in shares)		(39,947)
Shares withheld upon the vesting and conversion of RSUs		$ (4)		(826)								(830)
Common stock issued under stock compensation plans (in shares)		122,456
Common stock issued under stock compensation plans		$ 12		223								235
Common stock issued under dividend reinvestment and stock purchase plan (in shares)		69,898
Common stock issued under dividend reinvestment and stock purchase plan		$ 7		1,427								1,434
Stock-based compensation				1,295								1,295
Cash dividends declared							(4,251)					(4,251)
Balance (in shares) at Mar. 31, 2019		24,900,347
Balance at Mar. 31, 2019		$ 2,490		132,018			256,512		(4,578)			386,442
Balance (in shares) at Dec. 31, 2018		25,422,740
Balance at Dec. 31, 2018		$ 2,542		145,163			249,922		(9,440)			388,187
Net income												21,585
Other comprehensive income (loss)												8,182
Balance (in shares) at Jun. 30, 2019		24,661,409
Balance at Jun. 30, 2019		$ 2,466		127,162			263,067		(1,258)			391,437
Balance (in shares) at Mar. 31, 2019		24,900,347
Balance at Mar. 31, 2019		$ 2,490		132,018			256,512		(4,578)			386,442
Net income							10,744					10,744
Other comprehensive income (loss)									3,320			3,320
Repurchase of common stock (in shares)		(240,300)
Repurchase of common stock		$ (24)		(5,259)								(5,283)
Common stock issued under stock compensation plans (in shares)		1,362
Common stock issued under stock compensation plans				30								30
Stock-based compensation				373								373
Cash dividends declared							(4,189)					(4,189)
Balance (in shares) at Jun. 30, 2019		24,661,409
Balance at Jun. 30, 2019		$ 2,466		127,162			263,067		(1,258)			391,437
Balance (in shares) at Dec. 31, 2019	23,934,632	23,934,632
Balance at Dec. 31, 2019	$ 2,393	$ 2,393	$ 111,744	111,744	$ 272,051	$ (2,325)	274,376	$ 595	595	$ 386,783	$ (2,325)	389,108
Net income							9,148					9,148
Other comprehensive income (loss)									(8,836)			(8,836)
Repurchase of common stock (in shares)		(261,700)
Repurchase of common stock		$ (26)		(5,911)								(5,937)
Shares withheld upon the vesting and conversion of RSUs (in shares)		(66,142)
Shares withheld upon the vesting and conversion of RSUs		$ (6)		(1,521)								(1,527)
Common stock issued under stock compensation plans (in shares)		178,373
Common stock issued under stock compensation plans		$ 18		205								223
Common stock issued under dividend reinvestment and stock purchase plan (in shares)		21,738
Common stock issued under dividend reinvestment and stock purchase plan		$ 2		388								390
Stock-based compensation				251								251
Cash dividends declared							(4,286)					(4,286)
Balance (in shares) at Mar. 31, 2020		23,806,901
Balance at Mar. 31, 2020		$ 2,381		105,156			276,913		(8,241)			376,209
Balance (in shares) at Dec. 31, 2019	23,934,632	23,934,632
Balance at Dec. 31, 2019	$ 2,393	$ 2,393	$ 111,744	111,744	$ 272,051	$ (2,325)	274,376	$ 595	595	$ 386,783	$ (2,325)	389,108
Net income												19,907
Other comprehensive income (loss)									(2,668)			(2,668)
Balance (in shares) at Jun. 30, 2020		23,848,626
Balance at Jun. 30, 2020		$ 2,385		106,047			283,379		(2,073)			389,738
Balance (in shares) at Mar. 31, 2020		23,806,901
Balance at Mar. 31, 2020		$ 2,381		105,156			276,913		(8,241)			376,209
Net income							10,759					10,759
Other comprehensive income (loss)									6,168			6,168
Common stock issued under stock compensation plans (in shares)		41,725
Common stock issued under stock compensation plans		$ 4		32								36
Stock-based compensation				859								859
Cash dividends declared							(4,293)					(4,293)
Balance (in shares) at Jun. 30, 2020		23,848,626
Balance at Jun. 30, 2020		$ 2,385		$ 106,047			$ 283,379		$ (2,073)			$ 389,738