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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | $ 10,644 | $ 13,075 | $ 13,075
Charge-offs |  |  | (847) | (4,300) | (4,492)
Recoveries |  |  | 619 | 575 | 2,486
Provision for (recovery of) loan losses | (100) | 275 | (700) | 2,525 | (425)
Balance at end of period | 9,716 | 11,875 | 9,716 | 11,875 | 10,644
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 1,709 | 1,081 | 1,709 | 1,081 | 1,379
Allowance for loan losses, Collectively evaluated for impairment | 8,007 | 10,794 | 8,007 | 10,794 | 9,265
Loans: |  |  |  |  |
Ending Balance | 374,690 | 366,827 | 374,690 | 366,827 | 357,093
Loans, Individually evaluated for impairment | 16,843 | 17,590 | 16,843 | 17,590 | 21,694
Loans, Collectively evaluated for impairment | 357,847 | 349,237 | 357,847 | 349,237 | 335,399
Construction and Land Development [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | 2,710 | 2,481 | 2,481
Charge-offs |  |  | (91) | (2,923) | (2,962)
Recoveries |  |  | 79 |  |
Provision for (recovery of) loan losses |  |  | (832) | 3,385 | 3,191
Balance at end of period | 1,866 | 2,943 | 1,866 | 2,943 | 2,710
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 626 | 743 | 626 | 743 | 882
Allowance for loan losses, Collectively evaluated for impairment | 1,240 | 2,200 | 1,240 | 2,200 | 1,828
Loans: |  |  |  |  |
Ending Balance | 29,862 | 34,404 | 29,862 | 34,404 | 34,060
Loans, Individually evaluated for impairment | 3,382 | 7,217 | 3,382 | 7,217 | 6,862
Loans, Collectively evaluated for impairment | 26,480 | 27,187 | 26,480 | 27,187 | 27,198
Secured by 1-4 Family Residential [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | 2,975 | 3,712 | 3,712
Charge-offs |  |  | (259) | (260) | (260)
Recoveries |  |  | 10 | 47 | 823
Provision for (recovery of) loan losses |  |  | 185 | (332) | (1,300)
Balance at end of period | 2,911 | 3,167 | 2,911 | 3,167 | 2,975
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 133 | 81 | 133 | 81 | 190
Allowance for loan losses, Collectively evaluated for impairment | 2,778 | 3,086 | 2,778 | 3,086 | 2,785
Loans: |  |  |  |  |
Ending Balance | 155,298 | 142,446 | 155,298 | 142,446 | 141,961
Loans, Individually evaluated for impairment | 3,436 | 3,439 | 3,436 | 3,439 | 3,431
Loans, Collectively evaluated for impairment | 151,862 | 139,007 | 151,862 | 139,007 | 138,530
Other Real Estate [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | 4,418 | 6,163 | 6,163
Charge-offs |  |  | (203) | (976) | (1,070)
Recoveries |  |  | 340 | 214 | 1,304
Provision for (recovery of) loan losses |  |  | (131) | (89) | (1,979)
Balance at end of period | 4,424 | 5,312 | 4,424 | 5,312 | 4,418
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 914 | 201 | 914 | 201 | 263
Allowance for loan losses, Collectively evaluated for impairment | 3,510 | 5,111 | 3,510 | 5,111 | 4,155
Loans: |  |  |  |  |
Ending Balance | 154,769 | 156,691 | 154,769 | 156,691 | 145,968
Loans, Individually evaluated for impairment | 9,899 | 6,690 | 9,899 | 6,690 | 11,143
Loans, Collectively evaluated for impairment | 144,870 | 150,001 | 144,870 | 150,001 | 134,825
Commercial and Industrial [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | 442 | 608 | 608
Charge-offs |  |  | (43) | (31) | (37)
Recoveries |  |  | 16 | 177 | 179
Provision for (recovery of) loan losses |  |  | (58) | (359) | (308)
Balance at end of period | 357 | 395 | 357 | 395 | 442
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 36 | 56 | 36 | 56 | 44
Allowance for loan losses, Collectively evaluated for impairment | 321 | 339 | 321 | 339 | 398
Loans: |  |  |  |  |
Ending Balance | 22,943 | 21,316 | 22,943 | 21,316 | 22,803
Loans, Individually evaluated for impairment | 126 | 244 | 126 | 244 | 258
Loans, Collectively evaluated for impairment | 22,817 | 21,072 | 22,817 | 21,072 | 22,545
Consumer and Other Loans [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Balance at beginning of year |  |  | 99 | 111 | 111
Charge-offs |  |  | (251) | (110) | (163)
Recoveries |  |  | 174 | 137 | 180
Provision for (recovery of) loan losses |  |  | 136 | (80) | (29)
Balance at end of period | 158 | 58 | 158 | 58 | 99
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 |  | 0 |  | 0
Allowance for loan losses, Collectively evaluated for impairment | 158 | 58 | 158 | 58 | 99
Loans: |  |  |  |  |
Ending Balance | 11,818 | 11,970 | 11,818 | 11,970 | 12,301
Loans, Individually evaluated for impairment | 0 |  | 0 |  | 0
Loans, Collectively evaluated for impairment | $ 11,818 | $ 11,970 | $ 11,818 | $ 11,970 | $ 12,301

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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 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 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + 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=35738203&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=35738203&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=35738203&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=35738203&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 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: 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 6: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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