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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Sep. 30, 2019 USD ($) Loan | Sep. 30, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 7 | 8 | 21 | 33
Recorded investment | $ | $ 196 | $ 473 | $ 1,142 | $ 1,458
Extensions of maturity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 0 | 0 | 2 | 1
Recorded investment | $ | $ 0 | $ 0 | $ 514 | $ 56
Interest-rate reductions |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 7 | 8 | 19 | 32
Recorded investment | $ | $ 196 | $ 473 | $ 628 | $ 1,402

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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