Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values Of Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	$ 273,684	$ 280,438
Available for sale securities, Unrealized Gains	8,855	8,718
Available for sale securities, Unrealized Losses	1,000	2,557
Available for sale securities, Estimated Fair Value	281,539	286,599
Taxable Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	191,466	201,881
Available for sale securities, Unrealized Gains	4,751	4,713
Available for sale securities, Unrealized Losses	763	2,526
Available for sale securities, Estimated Fair Value	195,454	204,068
U. S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	28,128	8,262
Available for sale securities, Unrealized Gains	892	495
Available for sale securities, Unrealized Losses		10
Available for sale securities, Estimated Fair Value	29,020	8,747
Government-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	133,812	152,815
Available for sale securities, Unrealized Gains	3,250	3,460
Available for sale securities, Unrealized Losses	492	770
Available for sale securities, Estimated Fair Value	136,570	155,505
Nongovernment Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	15,380	35,246
Available for sale securities, Unrealized Gains	509	742
Available for sale securities, Unrealized Losses	144	1,560
Available for sale securities, Estimated Fair Value	15,745	34,428
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	12,187	4,559
Available for sale securities, Unrealized Gains	71	16
Available for sale securities, Unrealized Losses	89	4
Available for sale securities, Estimated Fair Value	12,169	4,571
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	1,959	999
Available for sale securities, Unrealized Gains	29
Available for sale securities, Unrealized Losses	38	182
Available for sale securities, Estimated Fair Value	1,950	817
Tax-Exempt Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	82,141	78,480
Available for sale securities, Unrealized Gains	4,104	4,005
Available for sale securities, Unrealized Losses	237	31
Available for sale securities, Estimated Fair Value	86,008	82,454
Tax-Exempt State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	79,403	75,371
Available for sale securities, Unrealized Gains	4,104	3,986
Available for sale securities, Unrealized Losses	237	31
Available for sale securities, Estimated Fair Value	83,270	79,326
Tax-Exempt Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	2,738	3,109
Available for sale securities, Unrealized Gains		19
Available for sale securities, Unrealized Losses
Available for sale securities, Estimated Fair Value	2,738	3,128
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	77	77
Available for sale securities, Unrealized Gains
Available for sale securities, Unrealized Losses
Available for sale securities, Estimated Fair Value	$ 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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