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Information on Impaired PCI Loan Pools (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 USD ($) Loan | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Loan | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Unpaid principal balance | $ 6,323 |  | $ 6,323 |  | $ 11,277
Recorded investment | 6,271 |  | 6,271 |  | 11,184
Interest income recognized | 176 | $ 218 | 386 | $ 431 |
Average recorded investment | 6,282 | 12,387 | 7,827 | 12,639 |
PCI loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Unpaid principal balance | 1,120 |  | 1,120 |  | 3,759
Recorded investment | $ 1,122 |  | 1,122 |  | 2,834
Allowance for loan losses |  |  | $ 12 |  | $ 54
Number of impaired loans | Loan | 1,000 |  | 1,000 |  | 2,000
Interest income recognized | $ 35 | 87 | $ 118 | 177 |
Average recorded investment | $ 2,666 | $ 3,462 | $ 2,728 | $ 3,677 |

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