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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Allowance for loan losses: |  |  |
Balance at beginning of year | $ 13,075 | $ 12,937 | $ 12,937
Charge-offs | (4,300) | (2,583) | (3,793)
Recoveries | 575 | 240 | 376
Provision for (recovery of) loan losses | 2,525 | 3,455 | 3,555
Balance at end of period | 11,875 | 14,049 | 13,075
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 1,081 | 3,239 | 1,838
Allowance for loan losses, Collectively evaluated for impairment | 10,794 | 10,810 | 11,237
Loans |  |  |
Total | 366,827 | 380,752 | 383,594
Loans, Individually evaluated for impairment | 17,590 | 19,872 | 16,980
Loans, Collectively evaluated for impairment | 349,237 | 360,880 | 366,614
Construction and Land Development [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 2,481 | 2,843 | 2,843
Charge-offs | (2,923) | (369) | (431)
Recoveries |  | 1 | 1
Provision for (recovery of) loan losses | 3,385 | 1,059 | 68
Balance at end of period | 2,943 | 3,534 | 2,481
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 743 | 1,728 | 567
Allowance for loan losses, Collectively evaluated for impairment | 2,200 | 1,806 | 1,914
Loans |  |  |
Total | 34,404 | 44,725 | 43,524
Loans, Individually evaluated for impairment | 7,217 | 6,353 | 2,516
Loans, Collectively evaluated for impairment | 27,187 | 38,372 | 41,008
Secured by 1-4 Family Residential [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 3,712 | 3,766 | 3,766
Charge-offs | (260) | (761) | (761)
Recoveries | 47 | 2 | 68
Provision for (recovery of) loan losses | (332) | 992 | 639
Balance at end of period | 3,167 | 3,999 | 3,712
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 81 | 709 | 306
Allowance for loan losses, Collectively evaluated for impairment | 3,086 | 3,290 | 3,406
Loans |  |  |
Total | 142,446 | 128,354 | 134,964
Loans, Individually evaluated for impairment | 3,439 | 4,758 | 3,776
Loans, Collectively evaluated for impairment | 139,007 | 123,596 | 131,188
Other Real Estate [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 6,163 | 5,192 | 5,192
Charge-offs | (976) | (1,042) | (2,154)
Recoveries | 214 | 58 | 64
Provision for (recovery of) loan losses | (89) | 1,531 | 3,061
Balance at end of period | 5,312 | 5,739 | 6,163
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 201 | 762 | 930
Allowance for loan losses, Collectively evaluated for impairment | 5,111 | 4,977 | 5,233
Loans |  |  |
Total | 156,691 | 175,122 | 176,573
Loans, Individually evaluated for impairment | 6,690 | 8,597 | 10,528
Loans, Collectively evaluated for impairment | 150,001 | 166,525 | 166,045
Commercial and Industrial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 608 | 963 | 963
Charge-offs | (31) | (261) | (261)
Recoveries | 177 | 24 | 35
Provision for (recovery of) loan losses | (359) | (75) | (129)
Balance at end of period | 395 | 651 | 608
Ending Balance: |  |  |
Allowance for loan losses, Individually evaluated for impairment | 56 | 40 | 35
Allowance for loan losses, Collectively evaluated for impairment | 339 | 611 | 573
Loans |  |  |
Total | 21,316 | 24,216 | 20,718
Loans, Individually evaluated for impairment | 244 | 164 | 160
Loans, Collectively evaluated for impairment | 21,072 | 24,052 | 20,558
Consumer and Other Loans [Member] |  |  |
Allowance for loan losses: |  |  |
Balance at beginning of year | 111 | 173 | 173
Charge-offs | (110) | (150) | (186)
Recoveries | 137 | 155 | 208
Provision for (recovery of) loan losses | (80) | (52) | (84)
Balance at end of period | 58 | 126 | 111
Ending Balance: |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 58 | 126 | 111
Loans |  |  |
Total | 11,970 | 8,335 | 7,815
Loans, Collectively evaluated for impairment | $ 11,970 | $ 8,335 | $ 7,815

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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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