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Summary of significant accounting policies - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Segment Office | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items] |  |  |
Date of incorporation | Nov. 30, 2013 |  |
Date of Merger | Jun. 28, 2013 |  |
Effective date of Merger Agreement | Dec. 01, 2013 |  |
Number of full-service community banking offices | 26 |  |
Number of operating segments | 1 |  |
Reclassification of prior period items amounts effect on net income | $ 0 |  |
Valuation allowance on loans held for sale | 0 |  |
Non performing loans past due period for Non-accrual status | 90 days |  |
Maximum days of consumer loans past due | 120 days |  |
Finite useful life of intangible assets | 10 years |  |
Impairment losses on intangible assets | 0 | 0 | 0
Commitments subject to undue credit risk | 0 |  |
Advertising expense | 350 | 287 | 494
Income tax benefit recognition threshold | 50.00% |  |
Unrecognized tax benefit or accrued interest and penalties | 0 | 0 | 0
Income tax examination description | The Company recognizes accrued interest and penalties assessed as a result of a taxing authority examination through income tax expense. The Company files consolidated income tax returns in the United States of America and various states' jurisdictions. The Company is no longer subject to federal and state income tax examinations by taxing authorities for years before 2010. |  |
Unrecognized compensation cost related to stock options | $ 0 | $ 0 |
Stock Options [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Securities excluded from computing diluted earnings per share |  | 13,636 | 13,636
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Contractual terms | 6 months |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Finite useful life of intangible assets | 10 years |  |
Commercial Real Estate [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Maximum loan to value percentage | 75.00% |  |
Consumer Loan [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Maximum amortization period | 30 years |  |

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