Condensed Financial Statements Of Parent Company (Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Securities available for sale	$ 266,542	$ 280,792
Premises and equipment	23,737	21,572
Other assets	17,306	15,178
Total assets	1,758,647	1,492,429
Long-term borrowings	46,670	75,581
Subordinated debentures			$ 16,800
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	17,048	15,412
Total liabilities	1,603,287	1,348,685
Preferred stock, $1.00 par value, authorized 250,000 shares	0	0
Common stock and related surplus, $2.50 par value; authorized 20,000,000 shares; issued: 2016 - 10,883,509 shares, 2015 - 10,853,566 shares; outstanding: 2016 - 10,736,970 shares, 2015 - 10,671,744 shares	46,757	45,741
Unearned ESOP Shares	(1,583)	(1,964)
Retained earnings	113,448	100,423
Accumulated other comprehensive income	(3,262)	(456)	2,072
Total shareholders' equity	155,360	143,744	131,644	$ 111,072
Total liabilities and shareholders' equity	1,758,647	1,492,429
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	1,112	1,984	$ 13,115	$ 5,278
Investment in subsidiaries, eliminated in consolidation	175,513	164,787
Securities available for sale	77	166
Premises and equipment	101	81
Other assets	2,158	1,677
Total assets	178,961	168,695
Long-term borrowings	903	2,708
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	3,109	2,654
Total liabilities	23,601	24,951
Preferred stock, $1.00 par value, authorized 250,000 shares	0	0
Common stock and related surplus, $2.50 par value; authorized 20,000,000 shares; issued: 2016 - 10,883,509 shares, 2015 - 10,853,566 shares; outstanding: 2016 - 10,736,970 shares, 2015 - 10,671,744 shares	46,757	45,741
Unearned ESOP Shares	(1,583)	(1,964)
Retained earnings	113,448	100,423
Accumulated other comprehensive income	(3,262)	(456)
Total shareholders' equity	155,360	143,744
Total liabilities and shareholders' equity	$ 178,961	$ 168,695