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Loans and Leases Receivable and Allowance for Credit Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2020 derivative | Mar. 31, 2020 USD ($) Loan | Mar. 31, 2019 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | 12 | 16 | 12
Recorded investment |  | $ 775 | $ 899
Extensions of maturity |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | Loan |  | 4 | 2
Recorded investment |  | $ 245 | $ 514
Interest-rate reductions |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | Loan |  | 12 | 10
Recorded investment |  | $ 530 | $ 385

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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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