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Investment Securities - 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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| Schedule of Available-for-sale Securities [Line Items] |
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|
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| Proceeds from sale of securities available-for-sale |
$ 35,377,000 |
$ 952,000 |
$ 0 |
| Realized gross gain (loss) from sale of investment |
(33,000) |
47,000 |
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| Mortgage-Backed Securities [Member] |
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|
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| Schedule of Available-for-sale Securities [Line Items] |
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|
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| Total number of securities |
13 |
14 |
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| Number of securities in loss position |
3 |
3 |
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| Municipal Securities [Member] |
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|
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| Schedule of Available-for-sale Securities [Line Items] |
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|
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| Total number of securities |
9 |
9 |
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| Number of securities in loss position |
1 |
4 |
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| Mutual Fund [Member] |
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|
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| Schedule of Available-for-sale Securities [Line Items] |
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|
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| Number of securities in loss position |
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1 |
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| Securities Pledged [Member] |
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|
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| Schedule of Available-for-sale Securities [Line Items] |
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|
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| Securities carrying value |
$ 34,633,000 |
$ 35,206,000 |
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