Condensed Financial Statements Of Parent Company (Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Other investments	$ 14,185	$ 12,972
Premises and equipment	52,537	44,168
Other assets	29,791	12,025
Total assets	3,106,384	2,403,492
Long-term borrowings	699	717
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	39,355	22,840
Total liabilities	2,824,804	2,155,728
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: 2020 - 12,985,708 shares, 2019 - 12,474,641 shares; outstanding: 2020 - 12,942,004 shares, 2019 - 12,408,542 shares	94,964	80,084
Unearned ESOP Shares	(472)	(714)
Retained earnings	181,643	165,859
Accumulated other comprehensive income	5,445	2,535	$ (1,016)	$ 1,732
Total shareholders' equity	281,580	247,764	$ 219,830	$ 201,505
Total liabilities and shareholders' equity	$ 3,106,384	$ 2,403,492
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	250,000	250,000
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	12,985,708	12,474,641
Common stock, shares outstanding	12,942,004	12,408,542
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	43,704	66,099
Subordinated Debt	$ 29,364	$ 0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	5,937	2,185
Investment in subsidiaries	327,354	267,132
Other investments	7	77
Premises and equipment	97	146
Other assets	1,837	1,317
Total assets	335,232	270,857
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	4,699	3,504
Total liabilities	53,652	23,093
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: 2020 - 12,985,708 shares, 2019 - 12,474,641 shares; outstanding: 2020 - 12,942,004 shares, 2019 - 12,408,542 shares	94,964	80,084
Unearned ESOP Shares	(472)	(714)
Retained earnings	181,643	165,859
Accumulated other comprehensive income	5,445	2,535
Total shareholders' equity	281,580	247,764
Total liabilities and shareholders' equity	335,232	270,857
Subordinated Debt	$ 29,364	$ 0