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Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 15,030us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 24,613us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	$ 33,909us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses	(2,713)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(214)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(1,600)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Total Realized Gains on Sales and Calls of AFS Securities, Net	13,917us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	24,765us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet	32,451us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Call Option
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	$ 1,600us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember	$ 366us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember	$ 142us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember

X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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 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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