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Balance and Interest Income Related to Impaired Loan Pools (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	$ 9,781		$ 9,781		$ 8,547
Unpaid principal balance	10,397		10,397		9,332
Interest income recognized	33	76	334	1,039
Average recorded investment	10,430	18,893	9,458	17,859
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	1,208		1,208		52,033
Unpaid principal balance	1,223		1,223		69,320
Allowance for loan losses			196		747
Interest income recognized	82	721	2,154	839
Average recorded investment	$ 1,416	$ 23,538	$ 35,063	$ 15,799

X

- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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X

- 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=35738203&loc=d3e5212-111524

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X

- 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 15

-Subparagraph (c)(1)

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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