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Guarantees, Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary Of Commitments And Contingent Liabilities [Line Items]
Commitments and contingent liabilities
Standby Letters of Credit [Member]
Summary Of Commitments And Contingent Liabilities [Line Items]
Commitments and contingent liabilities	833	833
Commitments to Extend Credit [Member]
Summary Of Commitments And Contingent Liabilities [Line Items]
Commitments and contingent liabilities	$ 30,460	$ 31,644

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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