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Fair Value of Financial Instruments and Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Available-for-sale securities, Fair value	$ 231,986
Derivative financial instruments	370	334
Liabilities and Stockholders' Equity
Derivative financial instruments	51	28
Us Treasury Securities [Member]
Assets:
Available-for-sale securities, Fair value	501
Fair Value, Inputs, Level 1 [Member]
Assets:
Derivative financial instruments	0	0
Liabilities and Stockholders' Equity
Derivative financial instruments	0	0
Fair Value, Inputs, Level 1 [Member] | Us Treasury Securities [Member]
Assets:
Available-for-sale securities, Fair value	501	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Derivative financial instruments	370	334
Liabilities and Stockholders' Equity
Derivative financial instruments	51	28
Fair Value, Inputs, Level 2 [Member] | Us Treasury Securities [Member]
Assets:
Available-for-sale securities, Fair value	0
Fair Value, Inputs, Level 3 [Member]
Assets:
Derivative financial instruments	0	0
Liabilities and Stockholders' Equity
Derivative financial instruments	0	0
Fair Value, Inputs, Level 3 [Member] | Us Treasury Securities [Member]
Assets:
Available-for-sale securities, Fair value	0
Common Stock [Member]
Assets:
Available-for-sale securities, Fair value	1,007	902
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	1,007	902
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Agency Securities [Member]
Assets:
Available-for-sale securities, Fair value	14,620	8,848
Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	14,620	8,848
Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Nontaxable Municipal Bonds [Member]
Assets:
Available-for-sale securities, Fair value	82,727	77,286
Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	82,727	77,286
Nontaxable Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Taxable Municipal Bonds [Member]
Assets:
Available-for-sale securities, Fair value	48,388	38,142
Taxable Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Taxable Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	48,388	38,142
Taxable Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Collateralized Mortgage Backed Securities [Member]
Assets:
Available-for-sale securities, Fair value	77,989	81,848
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	77,989	81,848
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Certificates Of Deposit [Member]
Assets:
Available-for-sale securities, Fair value	6,754	6,274
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities, Fair value	0	0
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities, Fair value	6,754	6,274
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities, Fair value	$ 0	$ 0

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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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