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Business Combinations - Summary of Changes in Carrying Amount of Accretable Yield on Acquired Loans (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2014
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Dec. 15, 2014
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| Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract] | ||
| Acquisition of United | $ 1,480 | $ 9,027 |
| Accretion | (13) | |
| Net transfers from non-accretable difference to accretable yield | 0 | |
| Balance, end of year | $ 1,467 |