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Loans and Leases - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) SecurityLoan | Dec. 31, 2015 USD ($) SecurityLoan | Dec. 31, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 7 | 14 | 17
Pre-Modification Outstanding Recorded Investment | $ 4,188 | $ 3,178 | $ 10,383
Post-Modification Outstanding Recorded Investment | $ 4,076 | $ 3,002 | $ 9,830
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 21 | $ 1,230 | $ 2,205
Post-Modification Outstanding Recorded Investment | 23 | 1,227 | 2,032
Loan modifications made through reduction of principal or accrued interest payments | $ 23 |  |
Loan modification made through deferrals principal payment |  | $ 1,200 | $ 2,000
Real estate loans [Member] | Hotel/motel [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 3,764 | $ 0 | $ 832
Post-Modification Outstanding Recorded Investment | 3,722 | $ 0 | 821
Loan modification made through deferrals principal payment | $ 3,700 |  | $ 821
Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 2,040
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | 1,979
Loan modification made through deferrals principal payment |  |  | $ 2,000
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 2 | 3
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 725 | $ 1,422
Post-Modification Outstanding Recorded Investment | $ 0 | 724 | 1,352
Loan modifications made through reduction of principal or accrued interest payments |  |  | 385
Loan modification made through deferrals principal payment |  | $ 724 | 943
Amount of loan modification through extension of maturity |  |  | $ 24
Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 317
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | 308
Amount of loan modification through extension of maturity |  |  | $ 308
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 5 | 10 | 5
Pre-Modification Outstanding Recorded Investment | $ 403 | $ 973 | $ 721
Post-Modification Outstanding Recorded Investment | 331 | 801 | 629
Loan modifications made through reduction of principal or accrued interest payments | 65 | 60 | 184
Loan modification made through deferrals principal payment | 216 | 34 |
Amount of loan modification through extension of maturity | $ 50 | $ 707 | $ 445
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 3
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 2,366
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | 2,509
Loan modifications made through reduction of principal or accrued interest payments |  |  | 126
Loan modification made through deferrals principal payment |  |  | $ 2,400
Commercial and industrial loans [Member] | International loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 480
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | 200
Loan modifications made through reduction of principal or accrued interest payments |  |  | $ 200
Consumer loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 250 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | 250 | $ 0
Loan modification made through deferrals principal payment |  | $ 250 |

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