Condensed Financial Statements Of Parent Company (Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Securities available for sale	$ 328,723	$ 266,542
Premises and equipment	34,209	23,737
Other assets	11,329	17,306
Total assets	2,134,240	1,758,647
Long-term borrowings	45,751	46,670
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	16,295	17,048
Total liabilities	1,932,735	1,603,287
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: 2017 - 12,465,296 shares, 2016 - 10,883,509 shares; outstanding: 2017 - 12,358,562 shares, 2016 - 10,736,970 shares	81,098	46,757
Unearned ESOP Shares	(1,152)	(1,583)
Retained earnings	119,827	113,448
Accumulated other comprehensive income	1,732	(3,262)	$ (456)
Total shareholders' equity	201,505	155,360	143,744	$ 131,644
Total liabilities and shareholders' equity	2,134,240	1,758,647
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	2,299	1,112	$ 1,984	$ 13,115
Investment in subsidiaries	219,980	175,513
Securities available for sale	77	77
Premises and equipment	94	101
Other assets	1,318	2,158
Total assets	223,768	178,961
Long-term borrowings	0	903
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	2,674	3,109
Total liabilities	22,263	23,601
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: 2017 - 12,465,296 shares, 2016 - 10,883,509 shares; outstanding: 2017 - 12,358,562 shares, 2016 - 10,736,970 shares	81,098	46,757
Unearned ESOP Shares	(1,152)	(1,583)
Retained earnings	119,827	113,448
Accumulated other comprehensive income	1,732	(3,262)
Total shareholders' equity	201,505	155,360
Total liabilities and shareholders' equity	$ 223,768	$ 178,961