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Commitments - Financial Instrument Whose Contract Amounts Represent Credit Risk (Detail) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Commitments to Extend Credit [Member] | ||
| Product Royalty Future Minimum Payment Due [Line Items] | ||
| Commitments to extend credit | $ 182,820,000 | $ 141,887,000 |
| Standby Letters of Credit [Member] | ||
| Product Royalty Future Minimum Payment Due [Line Items] | ||
| Stand-by letters of credit | $ 8,085,000 | $ 4,066,000 |