Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Previously Reported [Member]	Impact of Adoption of New Accounting Standard [Member]	[1]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Previously Reported [Member]	Retained Earnings [Member]	Retained Earnings [Member] Previously Reported [Member]	Retained Earnings [Member] Impact of Adoption of New Accounting Standard [Member]	[1]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Previously Reported [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2018	$ 223,525	$ 223,209	$ 316		$ 8,460	$ 8,460	$ 177,565	$ 177,565	$ 39,878	$ 39,562	$ 316		$ (2,378)	$ (2,378)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member				us-gaap:AccountingStandardsUpdate201601Member		us-gaap:AccountingStandardsUpdate201601Member		us-gaap:AccountingStandardsUpdate201601Member				us-gaap:AccountingStandardsUpdate201601Member		us-gaap:AccountingStandardsUpdate201601Member
Net income	$ 4,077								$ 4,077
Total other comprehensive (loss) income, net of taxes	1,807												$ 1,807
Common stock dividends declared	(2,113)								(2,113)
Employee Stock Purchase Plan	28				$ 1		$ 27
Director Stock Purchase Plan	33				1		32
Restricted stock activity	80						80
Balance at Mar. 31, 2019	227,437				8,462		177,704		41,842				(571)
Balance at Dec. 31, 2018	223,525	$ 223,209	$ 316		8,460	$ 8,460	177,565	$ 177,565	39,878	$ 39,562	$ 316		(2,378)	$ (2,378)
Net income	13,293
Total other comprehensive (loss) income, net of taxes	2,509
Balance at Sep. 30, 2019	234,612				8,478		177,994		48,009				131
Balance at Mar. 31, 2019	227,437				8,462		177,704		41,842				(571)
Net income	4,403								4,403
Total other comprehensive (loss) income, net of taxes	797												797
Common stock dividends declared	(1,524)								(1,524)
Employee Stock Purchase Plan	36				2		34
Director Stock Purchase Plan	33				1		32
Restricted stock activity	80						80
Balance at Jun. 30, 2019	231,262				8,465		177,850		44,721				226
Net income	4,813								4,813
Total other comprehensive (loss) income, net of taxes	(95)												(95)
Common stock dividends declared	(1,525)								(1,525)
Employee Stock Purchase Plan	31				1		30
Director Stock Purchase Plan	35				1		34
Restricted stock activity	91				11		80
Balance at Sep. 30, 2019	234,612				8,478		177,994		48,009				131
Balance at Dec. 31, 2019	237,874				8,481		178,159		50,891				343
Net income	3,818								3,818
Total other comprehensive (loss) income, net of taxes	(395)												(395)
Common stock dividends declared	(1,950)								(1,950)
Employee Stock Purchase Plan	33				1		32
Director Stock Purchase Plan	35				2		33
Restricted stock activity	96						96
Balance at Mar. 31, 2020	239,511				8,484		178,320		52,759				(52)
Balance at Dec. 31, 2019	237,874				8,481		178,159		50,891				343
Net income	17,198
Total other comprehensive (loss) income, net of taxes	(627)
Balance at Sep. 30, 2020	248,189				8,508		178,659		63,099				(284)		$ (1,793)
Balance at Mar. 31, 2020	239,511				8,484		178,320		52,759				(52)
Net income	6,833								6,833
Total other comprehensive (loss) income, net of taxes	(98)												(98)
Common stock dividends declared	(1,523)								(1,523)
Repurchased stock	(1,560)														(1,560)
Employee Stock Purchase Plan	45				3		42
Director Stock Purchase Plan	41				2		39
Restricted stock activity	96						96
Balance at Jun. 30, 2020	243,345				8,489		178,497		58,069				(150)		(1,560)
Net income	6,547								6,547
Total other comprehensive (loss) income, net of taxes	(134)												(134)
Common stock dividends declared	(1,517)								(1,517)
Repurchased stock	(233)														(233)
Employee Stock Purchase Plan	36				2		34
Director Stock Purchase Plan	41				2		39
Restricted stock activity	104				15		89
Balance at Sep. 30, 2020	$ 248,189				$ 8,508		$ 178,659		$ 63,099				$ (284)		$ (1,793)

[1] Represents the impact of adopting Accounting Standard Update ASU 2016-02, Leases. See Note 2 to the consolidated financial statements for more information.