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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loan (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | $ 47,000 | $ 919,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 190,000 |
Total past due loans Greater Than 89 Days Past Due | 3,356,000 | 5,008,000 |
Total Past Due | 3,403,000 | 6,117,000 |
Current | 1,072,084,000 | 1,035,072,000 |
Total Loans | 1,075,487,000 | 1,041,189,000 | 1,035,288,000
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 22,000 | 80,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 631,000 | 871,000 |
Total Past Due | 653,000 | 951,000 |
Current | 286,234,000 | 284,371,000 |
Total Loans | 286,887,000 | 285,322,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial Vacant Land, Land Development, and Residential Construction [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 0 | 289,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 85,000 | 614,000 |
Total Past Due | 85,000 | 903,000 |
Current | 40,656,000 | 47,196,000 |
Total Loans | 40,741,000 | 48,099,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 0 | 199,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 53,000 | 1,337,000 |
Total Past Due | 53,000 | 1,536,000 |
Current | 258,603,000 | 257,741,000 |
Total Loans | 258,656,000 | 259,277,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial Real Estate - Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 0 | 303,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 1,860,000 | 1,123,000 |
Total Past Due | 1,860,000 | 1,426,000 |
Current | 366,441,000 | 323,460,000 |
Total Loans | 368,301,000 | 324,886,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial Real Estate - Multi-Family and Residential Rental [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 0 | 0 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 264,000 | 613,000 |
Total Past Due | 264,000 | 613,000 |
Current | 52,914,000 | 50,309,000 |
Total Loans | 53,178,000 | 50,922,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Commercial Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 22,000 | 871,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 2,893,000 | 4,558,000 |
Total Past Due | 2,915,000 | 5,429,000 |
Current | 1,004,848,000 | 963,077,000 |
Total Loans | 1,007,763,000 | 968,506,000 | 957,411,000
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Retail Home Equity and Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 0 | 1,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 0 |
Total past due loans Greater Than 89 Days Past Due | 0 | 13,000 |
Total Past Due | 0 | 14,000 |
Current | 36,575,000 | 38,903,000 |
Total Loans | 36,575,000 | 38,917,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Retail 1-4 Family Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 25,000 | 47,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 190,000 |
Total past due loans Greater Than 89 Days Past Due | 463,000 | 437,000 |
Total Past Due | 488,000 | 674,000 |
Current | 30,661,000 | 33,092,000 |
Total Loans | 31,149,000 | 33,766,000 |
Recorded Balance greater than 89 Days and Accruing | 0 | 0 |
Retail Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total past due loans 30 - 59 Days Past Due | 25,000 | 48,000 |
Total past due loans 60 - 89 Days Past Due | 0 | 190,000 |
Total past due loans Greater Than 89 Days Past Due | 463,000 | 450,000 |
Total Past Due | 488,000 | 688,000 |
Current | 67,236,000 | 71,995,000 |
Total Loans | 67,724,000 | 72,683,000 | 77,877,000
Recorded Balance greater than 89 Days and Accruing | $ 0 | $ 0 |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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