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Additional Information Related to the Impaired Loan Pools (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded investment | $ 10,889 |  | $ 10,889 |  | $ 9,568
Unpaid principal balance | 11,348 |  | 11,348 |  | 10,009
Interest income recognized | 128 | $ 33 | 523 | $ 334 |
Average recorded investment | 11,023 | 10,430 | 12,100 | 9,458 |
PCI loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded investment | 3,015 |  | 3,015 |  | 14,607
Unpaid principal balance | 3,978 |  | 3,978 |  | 31,169
Allowance for loan losses |  |  | 20 |  | $ 58
Interest income recognized | 96 | 82 | 273 | 2,154 |
Average recorded investment | $ 3,045 | $ 1,416 | $ 3,464 | $ 35,063 |

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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 average investment 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 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -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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