Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Impact Of Adopting ASU 2016-13 [Member] Retained Earnings [Member]	Impact Of Adopting ASU 2016-13 [Member]	As Reported Under ASC 326 [Member] Common Stock [Member]	As Reported Under ASC 326 [Member] Surplus [Member]	As Reported Under ASC 326 [Member] Retained Earnings [Member]	As Reported Under ASC 326 [Member] Accumulated Other Comprehensive Income (Loss) [Member]	As Reported Under ASC 326 [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [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, 2019			23,934,632					23,934,632
Balance at Dec. 31, 2019	$ (2,325)	$ (2,325)	$ 2,393	$ 111,744	$ 272,051	$ 595	$ 386,783	$ 2,393	111,744	274,376	595	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