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Loans and Leases - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) SecurityLoan | Dec. 31, 2016 USD ($) SecurityLoan | Dec. 31, 2015 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 4 | 7 | 14
Pre-Modification Outstanding Recorded Investment | $ 1,125 | $ 4,188 | $ 3,178
Post-Modification Outstanding Recorded Investment | $ 1,118 | $ 4,076 | $ 3,002
Real estate loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 2 | 2 | 3
Pre-Modification Outstanding Recorded Investment | $ 182 | $ 3,785 | $ 1,955
Post-Modification Outstanding Recorded Investment | $ 184 | $ 3,745 | $ 1,951
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 21 | $ 1,230
Post-Modification Outstanding Recorded Investment | $ 0 | 23 | 1,227
Loan modifications made through reduction of principal or accrued interest payments |  | $ 23 |
Loan modification made through deferrals principal payment |  |  | $ 1,200
Real estate loans [Member] | Hotel/motel [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 167 | $ 3,764 | $ 0
Post-Modification Outstanding Recorded Investment | 169 | 3,722 | $ 0
Loan modifications made through reduction of principal or accrued interest payments | $ 169 |  |
Loan modification made through deferrals principal payment |  | $ 3,700 |
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 0 | 2
Pre-Modification Outstanding Recorded Investment | $ 15 | $ 0 | $ 725
Post-Modification Outstanding Recorded Investment | 15 | $ 0 | 724
Loan modification made through deferrals principal payment | $ 15 |  | $ 724
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 5 | 10
Pre-Modification Outstanding Recorded Investment | $ 123 | $ 403 | $ 973
Post-Modification Outstanding Recorded Investment | 123 | 331 | 801
Loan modifications made through reduction of principal or accrued interest payments |  | 65 | 60
Loan modification made through deferrals principal payment | $ 123 | 216 | 34
Amount of loan modification through extension of maturity |  | $ 50 | $ 707
Consumer loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 820 | $ 0 | $ 250
Post-Modification Outstanding Recorded Investment | 811 | $ 0 | 250
Loan modification made through deferrals principal payment | $ 811 |  | $ 250

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