Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values Of Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	$ 283,033	$ 280,438	$ 286,384
Available for sale securities, Unrealized Gains	9,906	8,718	8,665
Available for sale securities, Unrealized Losses	947	2,557	2,607
Available for sale securities, Estimated Fair Value	291,992	286,599	292,442
Taxable Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	209,420	201,881	208,128
Available for sale securities, Unrealized Gains	5,548	4,713	5,563
Available for sale securities, Unrealized Losses	877	2,526	2,416
Available for sale securities, Estimated Fair Value	214,091	204,068	211,275
U. S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	25,857	8,262	8,351
Available for sale securities, Unrealized Gains	1,009	495	494
Available for sale securities, Unrealized Losses	4	10
Available for sale securities, Estimated Fair Value	26,862	8,747	8,845
Government-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	150,233	152,815	153,271
Available for sale securities, Unrealized Gains	3,741	3,460	3,974
Available for sale securities, Unrealized Losses	453	770	521
Available for sale securities, Estimated Fair Value	153,521	155,505	156,724
Nongovernment-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	21,199	35,246	40,946
Available for sale securities, Unrealized Gains	712	742	1,072
Available for sale securities, Unrealized Losses	290	1,560	1,738
Available for sale securities, Estimated Fair Value	21,621	34,428	40,280
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	10,176	4,559	4,561
Available for sale securities, Unrealized Gains	57	16	23
Available for sale securities, Unrealized Losses	56	4	5
Available for sale securities, Estimated Fair Value	10,177	4,571	4,579
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	1,955	999	999
Available for sale securities, Unrealized Gains	29
Available for sale securities, Unrealized Losses	74	182	152
Available for sale securities, Estimated Fair Value	1,910	817	847
Tax-Exempt Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	73,536	78,480	78,179
Available for sale securities, Unrealized Gains	4,358	4,005	3,102
Available for sale securities, Unrealized Losses	70	31	191
Available for sale securities, Estimated Fair Value	77,824	82,454	81,090
Tax-Exempt State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	70,678	75,371	78,179
Available for sale securities, Unrealized Gains	4,358	3,986	3,102
Available for sale securities, Unrealized Losses	70	31	191
Available for sale securities, Estimated Fair Value	74,966	79,326	81,090
Tax-Exempt Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	2,858	3,109
Available for sale securities, Unrealized Gains		19
Available for sale securities, Unrealized Losses
Available for sale securities, Estimated Fair Value	2,858	3,128
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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