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Premises and Equipment - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property, Plant and Equipment [Abstract] | |||
| Depreciation expense | $ 836,000 | $ 737,000 | $ 553,000 |