Estimated Fair Value of Financial Instruments - Assets Measured by Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities	$ 0	$ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Mortgage backed securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities	224,082	203,763
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities	69,826	36,970
Significant Other Observable Inputs (Level 2) [Member] \| Mortgage backed securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	104,540	111,701
Significant Other Observable Inputs (Level 2) [Member] \| Collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities	16,740	22,881
Significant Other Observable Inputs (Level 2) [Member] \| State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities	32,976	32,211
Significant Other Observable Inputs (Level 2) [Member] \| Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities	4,684	0
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Mortgage backed securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities	0	0
Significant Unobservable Inputs (Level 3) [Member] \| Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	4,684
Fair Value [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities	228,766	203,763
Fair Value [Member] \| U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities	69,826	36,970
Fair Value [Member] \| Mortgage backed securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	104,540	111,701
Fair Value [Member] \| Collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities	16,740	22,881
Fair Value [Member] \| State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities	32,976	32,211
Fair Value [Member] \| Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities	$ 4,684

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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