Commitments and Contingencies - Summary of Bank's Commitments and Contingent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Commitments [Line Items]
Total commitments	$ 187,454	$ 148,635
Commitments to extend credit [Member]
Other Commitments [Line Items]
Total commitments	181,569	144,333
Standby letters of credit [Member]
Other Commitments [Line Items]
Total commitments	4,011	3,012
Guaranteed commitments outstanding [Member]
Other Commitments [Line Items]
Total commitments	$ 1,874	$ 1,290

- Definition

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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