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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract | 1 | 0 | 2 | 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ | $ 2 | $ 0 | $ 11 | $ 0
Residential real estate [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 | $ |  |  | $ 9 | $ 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Contract | 1 | 0 | 1 | 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ | $ 2 | $ 0 | $ 2 | $ 0

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&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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