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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financial Assets |  |
Securities | $ 105,321 | $ 89,456
Bank owned life insurance | 9,213 | 9,014
Carrying Amount [Member] |  |
Financial Assets |  |
Cash and short-term investments | 37,870 | 31,028
Securities | 105,321 | 89,456
Loans held for sale |  | 503
Loans, net | 354,952 | 370,519
Bank owned life insurance | 9,213 | 9,014
Accrued interest receivable | 1,339 | 1,459
Financial Liabilities |  |
Deposits | 471,263 | 466,917
Other borrowings | 6,058 | 6,076
Trust preferred capital notes | 9,279 | 9,279
Accrued interest payable | 232 | 286
Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 37,870 | 31,028
Securities | 105,321 | 89,456
Loans held for sale |  | 503
Loans, net | 362,967 | 375,941
Bank owned life insurance | 9,213 | 9,014
Accrued interest receivable | 1,339 | 1,459
Financial Liabilities |  |
Deposits | 472,238 | 468,870
Other borrowings | 5,821 | 6,220
Trust preferred capital notes | 8,738 | 8,735
Accrued interest payable | 232 | 286
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 37,870 | 31,028
Securities | 5 | 3
Financial Liabilities |  |
Deposits |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Securities | 105,316 | 89,453
Loans held for sale |  | 503
Bank owned life insurance | 9,213 | 9,014
Accrued interest receivable | 1,339 | 1,459
Financial Liabilities |  |
Deposits | 325,598 | 306,719
Accrued interest payable | 232 | 286
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Loans, net | 362,967 | 375,941
Financial Liabilities |  |
Deposits | 146,640 | 162,151
Other borrowings | 5,821 | 6,220
Trust preferred capital notes | $ 8,738 | $ 8,735

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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13487-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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