Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	$ 195,309	$ 155,905
Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	195,309	155,905
Equity Securities [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	15,197	6,766
Equity Securities [Member] \| Fair Value, Recurring [Member] \| Domestic common stock [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	15,197	6,766
Debt Securities [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	180,112	149,139
Debt Securities [Member] \| Fair Value, Recurring [Member] \| States and political subdivisions [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	117,367	98,242
Debt Securities [Member] \| Fair Value, Recurring [Member] \| Corporate bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	52,679	39,810
Debt Securities [Member] \| Fair Value, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	10,066	11,087
Level 1 Inputs [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	15,197	6,766
Level 1 Inputs [Member] \| Equity Securities [Member] \| Fair Value, Recurring [Member] \| Domestic common stock [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	15,197	6,766
Level 1 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 1 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| States and political subdivisions [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 1 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| Corporate bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 1 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 2 Inputs [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	180,112	149,139
Level 2 Inputs [Member] \| Equity Securities [Member] \| Fair Value, Recurring [Member] \| Domestic common stock [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 2 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	180,112	149,139
Level 2 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| States and political subdivisions [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	117,367	98,242
Level 2 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| Corporate bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	52,679	39,810
Level 2 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value	10,066	11,087
Level 3 Inputs [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 3 Inputs [Member] \| Equity Securities [Member] \| Fair Value, Recurring [Member] \| Domestic common stock [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 3 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 3 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| States and political subdivisions [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 3 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| Corporate bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value
Level 3 Inputs [Member] \| Debt Securities [Member] \| Fair Value, Recurring [Member] \| U.S. agency-based mortgage-backed securities [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
Securities available for sale/Available-for-sale, Fair value

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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