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Loans and Leases - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) SecurityLoan | Dec. 31, 2015 USD ($) SecurityLoan | Dec. 31, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 2 | 6
Recorded Investment | $ | $ 50 | $ 590 | $ 3,561
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 1
Recorded Investment | $ | $ 0 | $ 0 | $ 1,856
Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 0
Recorded Investment | $ | $ 0 | $ 0 | $ 0
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 3
Recorded Investment | $ | $ 0 | $ 412 | $ 1,352
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 1 | 0
Recorded Investment | $ | $ 50 | $ 178 | $ 0
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 2
Recorded Investment | $ | $ 0 | $ 0 | $ 353

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524 + Details
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