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Loans - Summary of Information Pertaining to Non Accrual Non Covered Loans (Phantoms) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 24,386 | $ 24,412
Acquired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | 9,758 | 9,032
Acquired loans | ASC 310-30 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 2,200 | $ 1,700

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- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 + Details
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