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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Allowance for loan losses: |  |  |  |
Beginning Balance |  | $ 6,718 | $ 10,644 | $ 10,644
Charge-offs |  | (1,420) | (847) | (927)
Recoveries |  | 377 | 619 | 851
Provision for (recovery of) loan losses | $ (100) | (100) | (700) | (3,850)
Ending Balance | 9,716 | 5,575 | 9,716 | 6,718
Ending Balance: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 1,709 | 750 | 1,709 | 1,907
Allowance for loan losses, Collectively evaluated for impairment | 8,007 | 4,825 | 8,007 | 4,811
Loans: |  |  |  |
Ending Balance | 374,690 | 406,413 | 374,690 | 378,410
Loans, Individually evaluated for impairment | 16,843 | 8,840 | 16,843 | 13,922
Loans, Collectively evaluated for impairment | 357,847 | 397,573 | 357,847 | 364,488
Construction and Land Development [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance |  | 1,403 | 2,710 | 2,710
Charge-offs |  |  | (91) | (91)
Recoveries |  | 3 | 79 | 80
Provision for (recovery of) loan losses |  | (150) | (832) | (1,296)
Ending Balance | 1,866 | 1,256 | 1,866 | 1,403
Ending Balance: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 626 | 132 | 626 | 245
Allowance for loan losses, Collectively evaluated for impairment | 1,240 | 1,124 | 1,240 | 1,158
Loans: |  |  |  |
Ending Balance | 29,862 | 29,935 | 29,862 | 29,475
Loans, Individually evaluated for impairment | 3,382 | 3,081 | 3,382 | 3,205
Loans, Collectively evaluated for impairment | 26,480 | 26,854 | 26,480 | 26,270
Secured by 1-4 Family Residential [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance |  | 1,204 | 2,975 | 2,975
Charge-offs |  | (47) | (259) | (272)
Recoveries |  | 90 | 10 | 15
Provision for (recovery of) loan losses |  | (368) | 185 | (1,514)
Ending Balance | 2,911 | 879 | 2,911 | 1,204
Ending Balance: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 133 | 22 | 133 | 173
Allowance for loan losses, Collectively evaluated for impairment | 2,778 | 857 | 2,778 | 1,031
Loans: |  |  |  |
Ending Balance | 155,298 | 179,419 | 155,298 | 163,727
Loans, Individually evaluated for impairment | 3,436 | 2,151 | 3,436 | 3,414
Loans, Collectively evaluated for impairment | 151,862 | 177,268 | 151,862 | 160,313
Other Real Estate [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance |  | 3,658 | 4,418 | 4,418
Charge-offs |  | (950) | (203) | (203)
Recoveries |  | 2 | 340 | 509
Provision for (recovery of) loan losses |  | 288 | (131) | (1,066)
Ending Balance | 4,424 | 2,998 | 4,424 | 3,658
Ending Balance: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 914 | 596 | 914 | 1,456
Allowance for loan losses, Collectively evaluated for impairment | 3,510 | 2,402 | 3,510 | 2,202
Loans: |  |  |  |
Ending Balance | 154,769 | 165,661 | 154,769 | 151,802
Loans, Individually evaluated for impairment | 9,899 | 3,509 | 9,899 | 7,183
Loans, Collectively evaluated for impairment | 144,870 | 162,152 | 144,870 | 144,619
Commercial and Industrial [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance |  | 310 | 442 | 442
Charge-offs |  | (59) | (43) | (43)
Recoveries |  | 69 | 16 | 18
Provision for (recovery of) loan losses |  | (68) | (58) | (107)
Ending Balance | 357 | 252 | 357 | 310
Ending Balance: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 36 |  | 36 | 33
Allowance for loan losses, Collectively evaluated for impairment | 321 | 252 | 321 | 277
Loans: |  |  |  |
Ending Balance | 22,943 | 19,950 | 22,943 | 21,166
Loans, Individually evaluated for impairment | 126 | 99 | 126 | 120
Loans, Collectively evaluated for impairment | 22,817 | 19,851 | 22,817 | 21,046
Consumer and Other Loans [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance |  | 143 | 99 | 99
Charge-offs |  | (364) | (251) | (318)
Recoveries |  | 213 | 174 | 229
Provision for (recovery of) loan losses |  | 198 | 136 | 133
Ending Balance | 158 | 190 | 158 | 143
Ending Balance: |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 158 | 190 | 158 | 143
Loans: |  |  |  |
Ending Balance | 11,818 | 11,448 | 11,818 | 12,240
Loans, Collectively evaluated for impairment | $ 11,818 | $ 11,448 | $ 11,818 | $ 12,240

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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=49124121&loc=SL6953423-111524 + Details
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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 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 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 + 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=49124121&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=49124121&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=49124121&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=49124121&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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: 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=49124121&loc=SL6953423-111524 Reference 3: 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 4: 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 5: 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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