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Net Loss or Gain from Sale of Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains									$ 2,257us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 553us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 723us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses									(3,642)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(154)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(240)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net (loss) gain on sale of securities	$ (1,691)us-gaap_GainLossOnSaleOfSecuritiesNet	$ 320us-gaap_GainLossOnSaleOfSecuritiesNet	$ (59)us-gaap_GainLossOnSaleOfSecuritiesNet	$ 45us-gaap_GainLossOnSaleOfSecuritiesNet	$ 208us-gaap_GainLossOnSaleOfSecuritiesNet	$ (39)us-gaap_GainLossOnSaleOfSecuritiesNet	$ 113us-gaap_GainLossOnSaleOfSecuritiesNet	$ 117us-gaap_GainLossOnSaleOfSecuritiesNet	$ (1,385)us-gaap_GainLossOnSaleOfSecuritiesNet	$ 399us-gaap_GainLossOnSaleOfSecuritiesNet	$ 483us-gaap_GainLossOnSaleOfSecuritiesNet

X

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(h))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Subparagraph h

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Article 7

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