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Additional Information Related to the Impaired Loan Pools (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded investment | $ 12,383 |  | $ 12,383 |  | $ 9,568
Unpaid principal balance | 12,839 |  | 12,839 |  | 10,009
Interest income recognized | 100 | $ 219 | 395 | $ 462 |
Average recorded investment | 12,387 | 8,588 | 12,639 | 8,976 |
PCI loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded investment | 3,125 |  | 3,125 |  | 14,607
Unpaid principal balance | 4,077 |  | 4,077 |  | 31,169
Allowance for loan losses |  |  | 114 |  | $ 58
Interest income recognized | 87 | 1,290 | 177 | 2,072 |
Average recorded investment | $ 3,462 | $ 55,024 | $ 3,677 | $ 52,166 |

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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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