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Information on Impaired PCI Loan Pools (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Loan | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Loan | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Unpaid principal balance | $ 7,652 |  | $ 7,652 |  | $ 11,277
Recorded investment | 7,436 |  | 7,436 |  | 11,184
Interest income recognized | 169 | $ 128 | 555 | $ 523 |
Average recorded investment | 7,665 | 11,023 | 7,773 | 12,100 |
PCI loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Unpaid principal balance | 1,104 |  | 1,104 |  | 3,759
Recorded investment | $ 1,104 |  | 1,104 |  | 2,834
Allowance for loan losses |  |  | $ 12 |  | $ 54
Number of impaired loans | Loan | 1 |  | 1 |  | 2
Interest income recognized | $ 12 | 96 | $ 130 | 273 |
Average recorded investment | $ 1,139 | $ 3,045 | $ 2,195 | $ 3,464 |

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