Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified

Jun. 30, 2012

Dec. 31, 2011

Jun. 30, 2011

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

$ 289,151

$ 286,599

$ 295,806

Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

289,151

286,599

Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

U. S. Government Agencies And Corporations [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

18,663

8,747

14,950

U. S. Government Agencies And Corporations [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

U. S. Government Agencies And Corporations [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

18,663

8,747

U. S. Government Agencies And Corporations [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Government-Sponsored Agencies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

161,167

155,505

150,611

Government-Sponsored Agencies [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Government-Sponsored Agencies [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

161,167

155,505

Government-Sponsored Agencies [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Nongovernment-Sponsored Agencies [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

23,261

34,428

44,037

Nongovernment-Sponsored Agencies [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Nongovernment-Sponsored Agencies [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

23,261

34,428

Nongovernment-Sponsored Agencies [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

State And Political Subdivisions [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

8,656

4,571

12,157

State And Political Subdivisions [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

State And Political Subdivisions [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

8,656

4,571

State And Political Subdivisions [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Corporate Debt Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

1,840

817

946

Corporate Debt Securities [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Corporate Debt Securities [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

1,840

817

Corporate Debt Securities [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Equity Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Equity Securities [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Equity Securities [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Equity Securities [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Tax-Exempt State And Political Subdivisions [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

72,518

79,326

73,028

Tax-Exempt State And Political Subdivisions [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Tax-Exempt State And Political Subdivisions [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

72,518

79,326

Tax-Exempt State And Political Subdivisions [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Tax-Exempt Mortgage-Backed Securities [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

2,969

3,128

Tax-Exempt Mortgage-Backed Securities [Member] | Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

Tax-Exempt Mortgage-Backed Securities [Member] | Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

2,969

3,128

Tax-Exempt Mortgage-Backed Securities [Member] | Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available for sale securities, fair value

- Definition

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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