Securities (Summary Of Amortized Cost, Unrealized Gains, Unrealized Losses And Estimated Fair Values Of Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	$ 281,511	$ 280,438	$ 292,395
Available for sale securities, Unrealized Gains	8,837	8,718	6,231
Available for sale securities, Unrealized Losses	1,197	2,557	2,820
Available for sale securities, Estimated Fair Value	289,151	286,599	295,806
Taxable Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	209,429	201,881	219,879
Available for sale securities, Unrealized Gains	5,104	4,713	5,080
Available for sale securities, Unrealized Losses	946	2,526	2,258
Available for sale securities, Estimated Fair Value	213,587	204,068	222,701
U. S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	18,000	8,262	14,749
Available for sale securities, Unrealized Gains	665	495	303
Available for sale securities, Unrealized Losses	2	10	102
Available for sale securities, Estimated Fair Value	18,663	8,747	14,950
Government-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	157,618	152,815	147,619
Available for sale securities, Unrealized Gains	3,846	3,460	3,288
Available for sale securities, Unrealized Losses	297	770	296
Available for sale securities, Estimated Fair Value	161,167	155,505	150,611
Nongovernment-Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	23,188	35,246	44,101
Available for sale securities, Unrealized Gains	550	742	1,459
Available for sale securities, Unrealized Losses	477	1,560	1,523
Available for sale securities, Estimated Fair Value	23,261	34,428	44,037
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	8,672	4,559	12,411
Available for sale securities, Unrealized Gains	27	16	30
Available for sale securities, Unrealized Losses	43	4	284
Available for sale securities, Estimated Fair Value	8,656	4,571	12,157
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	1,951	999	999
Available for sale securities, Unrealized Gains	16
Available for sale securities, Unrealized Losses	127	182	53
Available for sale securities, Estimated Fair Value	1,840	817	946
Tax-Exempt Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	72,005	78,480	72,439
Available for sale securities, Unrealized Gains	3,733	4,005	1,151
Available for sale securities, Unrealized Losses	251	31	562
Available for sale securities, Estimated Fair Value	75,487	82,454	73,028
Tax-Exempt State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	69,036	75,371	72,439
Available for sale securities, Unrealized Gains	3,733	3,986	1,151
Available for sale securities, Unrealized Losses	251	31	562
Available for sale securities, Estimated Fair Value	72,518	79,326	73,028
Tax-Exempt Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Amortized Cost	2,969	3,109
Available for sale securities, Unrealized Gains		19
Available for sale securities, Unrealized Losses
Available for sale securities, Estimated Fair Value	2,969	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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