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Loans and Leases - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) SecurityLoan | Mar. 31, 2016 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 0 | 3
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 235
Post-Modification Outstanding Recorded Investment | $ 0 | $ 229
Real estate loans [Member] | Retail [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 21
Post-Modification Outstanding Recorded Investment | $ 0 | 20
Loan modifications made through reduction of principal or accrued interest payments |  | $ 20
Commercial and industrial loans [Member] | Commercial term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | SecurityLoan | 0 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 214
Post-Modification Outstanding Recorded Investment | $ 0 | 209
Loan modification made through deferrals principal payment |  | 152
Amount of loan modification through extension of maturity |  | $ 57

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- Definition Loan modification made through deferral of principal payment. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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