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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) Loan | Jun. 30, 2018 USD ($) Loan | Jun. 30, 2019 USD ($) Loan | Jun. 30, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 2 | 16 | 14 | 25
Recorded investment | $ | $ 47 | $ 663 | $ 946 | $ 985
Extensions of maturity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 0 | 1 | 2 | 1
Recorded investment | $ | $ 0 | $ 56 | $ 514 | $ 56
Interest-rate reductions |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | Loan | 2 | 15 | 12 | 24
Recorded investment | $ | $ 47 | $ 607 | $ 432 | $ 929

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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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