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Information on Impaired PCI Loan Pools (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Loan | Dec. 31, 2015 USD ($) Loan | Dec. 31, 2014 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |
Unpaid principal balance | $ 24,133 | $ 27,005 |
Recorded investment | 22,074 | 25,402 |
Interest income recognized | 1,356 | 952 | $ 1,054
Average recorded investment | 27,494 | 29,064 | 25,128
PCI loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Unpaid principal balance | 1,086 | 3,759 |
Recorded investment | 1,085 | 2,834 |
Allowance for loan losses | $ 12 | $ 54 |
Number of impaired loans | Loan | 1 | 2 |
Interest income recognized | $ 142 | $ 364 | 3,081
Average recorded investment | $ 1,929 | $ 3,309 | $ 30,007

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