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Commitments and Off-Balance Sheet Risk - Summary of Contractual Amounts of Financial Instruments with Off-balance Sheet Risk (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | $ 377,135,000 | $ 334,768,000
Commercial unused lines of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 225,732,000 | 222,237,000
Unused lines of credit secured by 1 - 4 family residential properties [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 23,430,000 | 24,250,000
Credit card unused lines of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 8,555,000 | 8,512,000
Other consumer unused lines of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 6,379,000 | 4,613,000
Commitments to extend credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | 92,382,000 | 64,565,000
Standby letters of credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Contractual amounts of financial instruments with off-balance sheet risk | $ 20,657,000 | $ 10,591,000

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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