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Loans - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) SecurityLoan | Sep. 30, 2015 USD ($) SecurityLoan | Sep. 30, 2016 USD ($) SecurityLoan | Sep. 30, 2015 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 1 | 7 | 5 | 14
Pre-Modification Outstanding Recorded Investment | $ 100 | $ 2,062 | $ 356 | $ 3,281
Post-Modification Outstanding Recorded Investment | $ 89 | $ 2,036 | 319 | $ 3,061
Loan modifications made through reduction of principal or accrued interest payments |  |  | $ 23,000 |
Real estate loans [Member] | Retail [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 1,230 | $ 21 | $ 1,248
Post-Modification Outstanding Recorded Investment | $ 0 | $ 1,228 | $ 23 | 1,228
Loan modifications made through reduction of principal or accrued interest payments |  |  |  | $ 1,200
Real estate loans [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 0 | 1 | 0 | 2
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 412 | $ 0 | $ 731
Post-Modification Outstanding Recorded Investment | $ 0 | 412 | $ 0 | 725
Loan modifications made through reduction of principal or accrued interest payments |  | $ 1,200 |  |
Loan modification made through deferrals principal payment |  |  |  | $ 725
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | SecurityLoan | 1 | 5 | 4 | 10
Pre-Modification Outstanding Recorded Investment | $ 100 | $ 420 | $ 335 | $ 1,052
Post-Modification Outstanding Recorded Investment | 89 | 396 | 296 | 858
Loan modifications made through reduction of principal or accrued interest payments | $ 89,000 |  | 89 | 71
Loan modification made through deferrals principal payment |  | 412 | 154 | 38,000
Amount of loan modification through extension of maturity |  |  | $ 53 | $ 749
Consumer loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | SecurityLoan |  |  | 0 | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 0 | $ 250
Post-Modification Outstanding Recorded Investment |  |  | $ 0 | 250
Loan modifications made through reduction of principal or accrued interest payments |  | 31,000 |  |
Loan modification made through deferrals principal payment |  | 71 |  | $ 250
Amount of loan modification through extension of maturity |  | $ 293,000 |  |

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