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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
--- | --- | ---
Jun. 30, 2021 USD ($) Contract | Jun. 30, 2020 USD ($) Contract | Jun. 30, 2021 USD ($) Contract | Jun. 30, 2020 USD ($) Contract
Financing Receivable, Past Due [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 0 | 1 | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 0 | $ 50 | $ 0 | $ 50
Residential real estate [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 | $ 50 |  |
Residential real estate [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 | $ 50

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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=123577603&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=123577603&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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