Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values Of Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	$ 275,522	$ 273,684	$ 285,312
Available for sale securities, Unrealized Gains	8,644	8,855	8,386
Available for sale securities, Unrealized Losses	1,112	1,000	1,696
Available for sale securities, Estimated Fair Value	283,054	281,539	292,002
Taxable Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	203,858	191,466	211,285
Available for sale securities, Unrealized Gains	5,117	4,751	4,549
Available for sale securities, Unrealized Losses	841	763	1,390
Available for sale securities, Estimated Fair Value	208,134	195,454	214,444
U. S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	30,782	28,128	9,721
Available for sale securities, Unrealized Gains	1,035	892	475
Available for sale securities, Unrealized Losses			16
Available for sale securities, Estimated Fair Value	31,817	29,020	10,180
Government-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	142,534	133,812	161,928
Available for sale securities, Unrealized Gains	3,444	3,250	3,435
Available for sale securities, Unrealized Losses	647	492	525
Available for sale securities, Estimated Fair Value	145,331	136,570	164,838
Nongovernment Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	13,691	15,380	32,028
Available for sale securities, Unrealized Gains	483	509	627
Available for sale securities, Unrealized Losses	83	144	715
Available for sale securities, Estimated Fair Value	14,091	15,745	31,940
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	13,889	12,187	5,661
Available for sale securities, Unrealized Gains	122	71
Available for sale securities, Unrealized Losses	93	89	37
Available for sale securities, Estimated Fair Value	13,918	12,169	5,624
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	2,962	1,959	1,947
Available for sale securities, Unrealized Gains	33	29	12
Available for sale securities, Unrealized Losses	18	38	97
Available for sale securities, Estimated Fair Value	2,977	1,950	1,862
Tax-Exempt Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	71,587	82,141	73,950
Available for sale securities, Unrealized Gains	3,527	4,104	3,837
Available for sale securities, Unrealized Losses	271	237	306
Available for sale securities, Estimated Fair Value	74,843	86,008	77,481
Tax-Exempt State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	68,945	79,403	70,913
Available for sale securities, Unrealized Gains	3,527	4,104	3,837
Available for sale securities, Unrealized Losses	271	237	306
Available for sale securities, Estimated Fair Value	72,201	83,270	74,444
Tax-Exempt Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	2,642	2,738	3,037
Available for sale securities, Estimated Fair Value	2,642	2,738	3,037
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	77	77	77
Available for sale securities, Unrealized Gains
Available for sale securities, Unrealized Losses
Available for sale securities, Estimated Fair Value	$ 77	$ 77	$ 77

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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