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Loans and Allowance for Credit Losses - Troubled Debt Restructuring is 90 Days or More Past Due (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract | 0 | 4 | 1 | 4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ | $ 0 | $ 103 | $ 302 | $ 103
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract |  |  | 1 | 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ |  |  | $ 302 | $ 0
Residential real estate [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract | 0 | 4 |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ | $ 0 | $ 103 |  |
Residential real estate [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract |  |  | 0 | 4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ |  |  | $ 0 | $ 103

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + 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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