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Parent Company Only Condensed Financial Information - Condensed Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 25,152 | $ 61,436 | $ 34,275 | $ 2,973
Other assets | 2,447 | 2,239 |  |
Total assets | 215,035 | 250,920 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Subordinated debentures | 5,155 | 5,155 |  |
Stockholders' equity | 23,643 | 9,944 | 15,989 | 23,227
Total liabilities and stockholder's equity | 215,035 | 250,920 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 4,673 | 560 | 745 | 1,807
Investment in banking subsidiary | 23,060 | 13,827 |  |
Investment in and advances to other subsidiaries | 1,226 | 1,212 |  |
Other assets |  | 264 |  |
Total assets | 28,959 | 15,863 |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Subordinated debentures | 5,155 | 5,155 |  |
Accrued expenses and other liabilities | 161 | 764 |  |
Stockholders' equity | 23,643 | 9,944 |  |
Total liabilities and stockholder's equity | $ 28,959 | $ 15,863 |  |

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