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	8,480
Total other comprehensive (loss) income, net of taxes	2,604
Balance at Jun. 30, 2019	231,262				8,465		177,850		44,721				226
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
Balance at Dec. 31, 2019	$ 237,874				$ 8,481		$ 178,159		$ 50,891				$ 343
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	$ 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	10,651
Total other comprehensive (loss) income, net of taxes	(493)
Balance at Jun. 30, 2020	243,345				8,489		178,497		58,069				(150)		$ (1,560)
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 (80,523 shares)	(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)

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