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Loans - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) SecurityLoan | Dec. 31, 2014 USD ($) SecurityLoan | Dec. 31, 2013 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 14 | 17 | 33
Pre-Modification Outstanding Recorded Investment | $ 3,178,000 | $ 10,383,000 | $ 9,777,000
Post-Modification Outstanding Recorded Investment | $ 3,002,000 | $ 9,830,000 | $ 8,576,000
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 2 | 0
Pre-Modification Outstanding Recorded Investment | $ 1,230,000 | $ 2,205,000 | $ 0
Post-Modification Outstanding Recorded Investment | 1,227,000 | 2,032,000 | $ 0
Loan modifications made through reduction of principal or accrued interest payments | $ 1,200,000 |  |
Loan modification made through deferrals principal payment |  | $ 2,000,000 |
Real estate loans [Member] | Hotel/motel [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 832,000 | $ 1,000,000
Post-Modification Outstanding Recorded Investment | $ 0 | 821,000 | 1,000,000
Loan modification made through deferrals principal payment |  | $ 821,000 | $ 1,000,000
Real estate loans [Member] | Gas station [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 3
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 2,040,000 | $ 903,000
Post-Modification Outstanding Recorded Investment | $ 0 | 1,979,000 | 819,000
Loan modifications made through reduction of principal or accrued interest payments |  |  | 729,000
Loan modification made through deferrals principal payment |  | $ 2,000,000 | $ 90,000
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 2 | 3 | 4
Pre-Modification Outstanding Recorded Investment | $ 725,000 | $ 1,422,000 | $ 1,853,000
Post-Modification Outstanding Recorded Investment | 724,000 | 1,352,000 | 1,796,000
Loan modifications made through reduction of principal or accrued interest payments |  | 385,000 | 785,000
Loan modification made through deferrals principal payment | $ 725,000 | 943,000 | 365,000
Amount of loan modification through extension of maturity |  | $ 24,000 | $ 645,000
Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 317,000 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | 308,000 | $ 0
Amount of loan modification through extension of maturity |  | $ 308,000 |
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 10 | 5 | 20
Pre-Modification Outstanding Recorded Investment | $ 973,000 | $ 721,000 | $ 4,068,000
Post-Modification Outstanding Recorded Investment | 801,000 | 629,000 | 3,534,000
Loan modifications made through reduction of principal or accrued interest payments | 60,000 | 184,000 | 733,000
Loan modification made through deferrals principal payment | 34,000 |  | 386,000
Amount of loan modification through extension of maturity | $ 707,000 | $ 445,000 | $ 2,500,000
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 3 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 2,366,000 | $ 220,000
Post-Modification Outstanding Recorded Investment | 0 | 2,509,000 | $ 191,000
Loan modifications made through reduction of principal or accrued interest payments | $ 191,000 | 126,000 |
Loan modification made through deferrals principal payment |  | $ 2,400,000 |
Commercial and industrial loans [Member] | International loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 480,000 | $ 1,584,000
Post-Modification Outstanding Recorded Investment | $ 0 | 200,000 | 1,087,000
Loan modifications made through reduction of principal or accrued interest payments |  | $ 200,000 | $ 1,100,000
Consumer loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | SecurityLoan | 1 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 250,000 | $ 0 | $ 149,000
Post-Modification Outstanding Recorded Investment | 250,000 | $ 0 | 149,000
Loan modifications made through reduction of principal or accrued interest payments |  |  | $ 149,000
Loan modification made through deferrals principal payment | $ 250,000 |  |

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