Fair Value Measurements - Impaired Loans Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Impaired loans	$ 11,087	$ 11,637

Impaired Financing Receivable Estimated Fair Value

No definition available.

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