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Allowance for Loan Losses - Impaired Loans and Related Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | $ 2,259 | $ 3,947 | $ 3,546
Recorded Investment with No Allowance | 1,588 | 3,530 | 2,802
Recorded Investment with Allowance | 587 | 0 | 634
Total Recorded Investment | 2,175 | 3,530 | 3,436
Related Allowance | 129 | 0 | 243
Average Recorded Investment | 2,406 | 3,894 | 3,455
Interest Income Recognized | 10 | 48 | 85
Real estate loans | Construction and Land Development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 412 | 992 | 336
Recorded Investment with No Allowance | 0 | 874 | 0
Recorded Investment with Allowance | 398 | 0 | 327
Total Recorded Investment | 398 | 874 | 327
Related Allowance | 71 | 0 | 71
Average Recorded Investment | 326 | 1,257 | 758
Interest Income Recognized | 1 | 13 | 12
Real estate loans | Secured by 1-4 Family Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 1,055 | 1,417 | 720
Recorded Investment with No Allowance | 836 | 1,332 | 356
Recorded Investment with Allowance | 154 | 0 | 307
Total Recorded Investment | 990 | 1,332 | 663
Related Allowance | 23 | 0 | 172
Average Recorded Investment | 661 | 1,299 | 966
Interest Income Recognized | 2 | 15 | 22
Real estate loans | Other real estate loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 792 | 1,464 | 2,290
Recorded Investment with No Allowance | 752 | 1,263 | 2,249
Recorded Investment with Allowance | 35 | 0 | 0
Total Recorded Investment | 787 | 1,263 | 2,249
Related Allowance | 35 | 0 | 0
Average Recorded Investment | 1,329 | 1,274 | 1,585
Interest Income Recognized | 7 | 19 | 51
Commercial and industrial loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance | 0 | 74 | 200
Recorded Investment with No Allowance | 0 | 61 | 197
Recorded Investment with Allowance | 0 | 0 | 0
Total Recorded Investment | 0 | 61 | 197
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 90 | 64 | 146
Interest Income Recognized | $ 0 | $ 1 | $ 0

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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=84173941&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=84173941&loc=SL6953423-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + 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)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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