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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 15, 2014
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Aug. 29, 2014
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| Schedule Of Goodwill And Other Intangible Asset [Line Items] |
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| Goodwill associated with acquisition |
$ 28,834,000 |
$ 5,719,000 |
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| Core deposit intangible asset |
1,757,000 |
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| Amortization expense for intangible assets |
19,000 |
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| CBI [Member] |
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| Schedule Of Goodwill And Other Intangible Asset [Line Items] |
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| Goodwill associated with acquisition |
23,115,000 |
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23,115,000 |
| United Group Banking Company of Florida [Member] |
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| Schedule Of Goodwill And Other Intangible Asset [Line Items] |
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| Goodwill associated with acquisition |
5,719,000 |
5,719,000 |
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| Core deposit intangible asset |
1,776,000 |
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| Core Deposits [Member] |
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| Schedule Of Goodwill And Other Intangible Asset [Line Items] |
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| Amortized period of core deposit intangible |
7 years |
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| Core deposit intangible, gross |
1,776,000 |
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| Core deposit intangible asset, accumulated amortization |
19,000 |
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| Amortization expense for intangible assets |
$ 18,000 |
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