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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Allowance for loan losses: |  |  |  |  |
Beginning Balance | $ 5,321 | [1] | $ 5,524 | $ 5,524 |
Charge-offs | (106) |  | (120) | (788) |
Recoveries | 236 |  | 116 | 585 |
Provision for (recovery of) loan losses | 0 |  | 0 |  |
Ending Balance | 5,451 |  | 5,520 | 5,321 | [1]
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 31 |  | 434 | 37 |
Allowance for loan losses, Collectively evaluated for impairment | 5,420 |  | 5,086 | 5,284 |
Loans: |  |  |  |  |
Ending Balance | 497,770 |  | 454,076 | 486,067 |
Loans, Individually evaluated for impairment | 4,513 |  | 7,816 | 4,860 |
Loans, Collectively evaluated for impairment | 493,257 |  | 446,260 | 481,207 |
Construction and Land Development [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning Balance | 441 |  | 1,532 | 1,532 |
Recoveries | 1 |  | 1 | 4 |
Provision for (recovery of) loan losses | 39 |  | (163) | (1,095) |
Ending Balance | 481 |  | 1,370 | 441 |
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 222 |  |
Allowance for loan losses, Collectively evaluated for impairment | 481 |  | 1,148 | 441 |
Loans: |  |  |  |  |
Ending Balance | 36,024 |  | 31,505 | 34,699 |
Loans, Individually evaluated for impairment | 2,022 |  | 2,675 | 1,973 |
Loans, Collectively evaluated for impairment | 34,002 |  | 28,830 | 32,726 |
Secured by 1-4 Family Residential [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning Balance | 1,019 |  | 939 | 939 |
Charge-offs |  |  | (2) | (83) |
Recoveries | 128 |  | 9 | 293 |
Provision for (recovery of) loan losses | (187) |  | 38 | (130) |
Ending Balance | 960 |  | 984 | 1,019 |
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 31 |  | 22 | 37 |
Allowance for loan losses, Collectively evaluated for impairment | 929 |  | 962 | 982 |
Loans: |  |  |  |  |
Ending Balance | 205,623 |  | 196,165 | 198,763 |
Loans, Individually evaluated for impairment | 1,443 |  | 2,062 | 1,828 |
Loans, Collectively evaluated for impairment | 204,180 |  | 194,103 | 196,935 |
Other Real Estate [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning Balance | 3,142 |  | 2,534 | 2,534 |
Charge-offs |  |  |  | (165) |
Recoveries | 47 |  |  | 2 |
Provision for (recovery of) loan losses | 78 |  | 117 | 771 |
Ending Balance | 3,267 |  | 2,651 | 3,142 |
Ending Balance: |  |  |  |  |
Allowance for loan losses, Individually evaluated for impairment |  |  | 190 |  |
Allowance for loan losses, Collectively evaluated for impairment | 3,267 |  | 2,461 | 3,142 |
Loans: |  |  |  |  |
Ending Balance | 216,591 |  | 191,306 | 211,210 |
Loans, Individually evaluated for impairment | 977 |  | 2,990 | 984 |
Loans, Collectively evaluated for impairment | 215,614 |  | 188,316 | 210,226 |
Commercial and Industrial [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning Balance | 380 |  | 306 | 306 |
Recoveries | 5 |  | 3 | 11 |
Provision for (recovery of) loan losses | (10) |  | (12) | 63 |
Ending Balance | 375 |  | 297 | 380 |
Ending Balance: |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 375 |  | 297 | 380 |
Loans: |  |  |  |  |
Ending Balance | 29,192 |  | 24,215 | 29,981 |
Loans, Individually evaluated for impairment | 71 |  | 89 | 75 |
Loans, Collectively evaluated for impairment | 29,121 |  | 24,126 | 29,906 |
Consumer and Other Loans [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Beginning Balance | 339 |  | 213 | 213 |
Charge-offs | (106) |  | (118) | (540) |
Recoveries | 55 |  | 103 | 275 |
Provision for (recovery of) loan losses | 80 |  | 20 | 391 |
Ending Balance | 368 |  | 218 | 339 |
Ending Balance: |  |  |  |  |
Allowance for loan losses, Collectively evaluated for impairment | 368 |  | 218 | 339 |
Loans: |  |  |  |  |
Ending Balance | 10,340 |  | 10,885 | 11,414 |
Loans, Collectively evaluated for impairment | $ 10,340 |  | $ 10,885 | $ 11,414 |
[1] | Derived from audited consolidated financial statements.

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- Definition Financing receivable loans and leases receivable. + References No definition available. + 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=66008989&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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=66008989&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 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 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 + 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=65884687&loc=d3e4428-111522 + Details
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