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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Allowance for loan losses: |  |  |
Balance at beginning of year | $ 13,075 | $ 12,937 | $ 16,036
Charge-offs | (4,492) | (3,793) | (15,789)
Recoveries | 2,486 | 376 | 310
Provision for (recovery of) loan losses | (425) | 3,555 | 12,380
Balance at end of year | 10,644 | 13,075 | 12,937
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 1,379 | 1,838 | 2,438
Allowance for loan losses, Collectively evaluated for impairment | 9,265 | 11,237 | 10,499
Loans: |  |  |
Ending Balance | 357,093 | 383,594 | 392,440
Loans, Individually evaluated for impairment | 21,694 | 16,980 | 25,920
Loans, Collectively evaluated for impairment | 335,399 | 366,614 | 366,520
Construction and Land Development [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 2,481 | 2,843 | 4,050
Charge-offs | (2,962) | (431) | (2,983)
Recoveries |  | 1 | 50
Provision for (recovery of) loan losses | 3,191 | 68 | 1,726
Balance at end of year | 2,710 | 2,481 | 2,843
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 882 | 567 | 930
Allowance for loan losses, Collectively evaluated for impairment | 1,828 | 1,914 | 1,913
Loans: |  |  |
Ending Balance | 34,060 | 43,524 | 48,363
Loans, Individually evaluated for impairment | 6,862 | 2,516 | 7,640
Loans, Collectively evaluated for impairment | 27,198 | 41,008 | 40,723
Secured by 1-4 Family Residential [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 3,712 | 3,766 | 1,681
Charge-offs | (260) | (761) | (4,369)
Recoveries | 823 | 68 | 6
Provision for (recovery of) loan losses | (1,300) | 639 | 6,718
Balance at end of year | 2,975 | 3,712 | 3,766
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 190 | 306 | 848
Allowance for loan losses, Collectively evaluated for impairment | 2,785 | 3,406 | 2,918
Loans: |  |  |
Ending Balance | 141,961 | 134,964 | 122,339
Loans, Individually evaluated for impairment | 3,431 | 3,776 | 6,860
Loans, Collectively evaluated for impairment | 138,530 | 131,188 | 115,479
Other Real Estate [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 6,163 | 5,192 | 9,187
Charge-offs | (1,070) | (2,154) | (7,551)
Recoveries | 1,304 | 64 |
Provision for (recovery of) loan losses | (1,979) | 3,061 | 3,556
Balance at end of year | 4,418 | 6,163 | 5,192
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 263 | 930 | 351
Allowance for loan losses, Collectively evaluated for impairment | 4,155 | 5,233 | 4,841
Loans: |  |  |
Ending Balance | 145,968 | 176,573 | 181,141
Loans, Individually evaluated for impairment | 11,143 | 10,528 | 10,940
Loans, Collectively evaluated for impairment | 134,825 | 163,692 | 170,201
Commercial and Industrial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 608 | 963 | 858
Charge-offs | (37) | (261) | (348)
Recoveries | 179 | 35 | 3
Provision for (recovery of) loan losses | (308) | (129) | 450
Balance at end of year | 442 | 608 | 963
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 44 | 35 | 309
Allowance for loan losses, Collectively evaluated for impairment | 398 | 573 | 654
Loans: |  |  |
Ending Balance | 22,803 | 20,718 | 29,446
Loans, Individually evaluated for impairment | 258 | 160 | 480
Loans, Collectively evaluated for impairment | 22,545 | 20,558 | 28,966
Consumer and Other Loans [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 111 | 173 | 260
Charge-offs | (163) | (186) | (268)
Recoveries | 180 | 208 | 251
Provision for (recovery of) loan losses | (29) | (84) | (70)
Balance at end of year | 99 | 111 | 173
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 99 | 111 | 173
Loans: |  |  |
Ending Balance | 12,301 | 7,815 | 11,151
Loans, Individually evaluated for impairment |  |  |
Loans, Collectively evaluated for impairment | $ 12,301 | $ 7,815 | $ 11,151

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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