Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2014	$ 12,000	$ 14,577	$ 62,713	$ 26,483	$ 2,667	$ 0	$ 118,440
Net income				8,365			8,365
Other comprehensive income (loss), net of tax					(241)		(241)
Common stock cash dividends				(2,225)			(2,225)
5% Common stock dividend		736	5,228	(5,964)			0
Preferred stock cash dividends				(90)			(90)
Stock-based compensation including related tax benefit			229				229
Forfeiture of restricted stock			8			(8)	0
Issuance and reissuance of common stock including related tax benefit:
Issuance of common stock shares under the dividend reinvestment and stock purchase plan		37	499				536
Issuance of common stock shares under the stock option plan		103	264			8	375
Issuance of common stock shares under employee stock purchase plan		8	47				55
Balance at Sep. 30, 2015	12,000	15,461	68,988	26,569	2,426	0	125,444
Balance at Dec. 31, 2015	12,000	19,893	97,338	28,539	1,371	0	159,141
Net income				9,260			9,260
Other comprehensive income (loss), net of tax					1,144		1,144
Common stock cash dividends				(3,106)			(3,106)
5% Common stock dividend		998	7,575	(8,573)			0
Preferred stock cash dividends				(16)			(16)
Redemption of preferred stock	(12,000)						(12,000)
Stock-based compensation including related tax benefit			391				391
Forfeiture of restricted stock			8			(8)	0
Issuance and reissuance of common stock including related tax benefit:
Issuance of common stock shares under the dividend reinvestment and stock purchase plan		37	282			2	321
Issuance of common stock shares under the stock option plan		12	90			2	104
Issuance of common stock shares of stock-based compensation awards		6	(6)				0
Issuance of common stock shares under employee stock purchase plan		11	67				78
Balance at Sep. 30, 2016	$ 0	$ 20,957	$ 105,745	$ 26,104	$ 2,515	$ (4)	$ 155,317