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Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unpaid principal, ending balance | $ 23,241 | $ 25,816 |
PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 65,405 | 81,711 | 141,340
Carrying value, ending balance | 65,405 | 81,711 | 141,340
Unpaid principal, ending balance | 108,351 | 128,498 |
Peoples | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 7,432 | 9,196 | 26,907
Carrying value, ending balance | 7,432 | 9,196 | 26,907
Unpaid principal, ending balance | 14,142 | 17,431 |
Waccamaw Bank | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 56,580 | 70,584 | 112,093
Carrying value, ending balance | 56,580 | 70,584 | 112,093
Unpaid principal, ending balance | 89,385 | 105,677 |
Other | PCI loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying value, beginning balance | 1,393 | 1,931 | 2,340
Carrying value, ending balance | 1,393 | 1,931 | 2,340
Unpaid principal, ending balance | $ 4,824 | $ 5,390 |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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=35738203&loc=d3e5212-111524 + Details
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