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Related Party Transactions - Summary of Activity for Related Party Loans (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended |
|---|---|
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Dec. 31, 2014
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| Related Party Transactions [Abstract] | |
| Beginning balance | $ 518 |
| New loans | 268 |
| Repayments | (210) |
| Changes in related parties | 2,261 |
| Ending balance | $ 2,837 |