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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
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Mar. 31, 2019 USD ($) Contract | Mar. 31, 2018 USD ($) Contract
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 1 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 10 | $ 940
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 0 | $ 940
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 1 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 10 | $ 0

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&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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- Details
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- Details
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