The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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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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- Definition

The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.

+ References

No definition available.

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- Definition

Gains (losses) on maturities and other securities transactions

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Gross gains realized from maturities and other securities transactions not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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No definition available.

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Gross losses realized from maturities and other securities transactions not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Investment Securities - Gross Gains (Losses) Realized on Sales, Maturities and Other Securities Transactions Included in Earnings (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
Investments, Debt and Equity Securities [Abstract]
Gross gains, sales transactions									$ 746us-gaap_GainOnSaleOfInvestments	$ 14,098us-gaap_GainOnSaleOfInvestments	$ 6,621us-gaap_GainOnSaleOfInvestments
Gross losses, sales transactions									(2)us-gaap_LossOnSaleOfInvestments	(44)us-gaap_LossOnSaleOfInvestments	(1,050)us-gaap_LossOnSaleOfInvestments
Gains on sales transactions, net									744us-gaap_GainLossOnSaleOfInvestments	14,054us-gaap_GainLossOnSaleOfInvestments	5,571us-gaap_GainLossOnSaleOfInvestments
Gross gains, maturities and other securities transactions									10	662	2,327
Gross losses, maturities and other securities transactions									(9)	(38)	(5,311)
Gains (losses) on maturities and other securities transactions, net									1	624	(2,984)
Gains on securities transactions, net	$ 643us-gaap_GainLossOnSaleOfSecuritiesNet	$ 103us-gaap_GainLossOnSaleOfSecuritiesNet	$ 7us-gaap_GainLossOnSaleOfSecuritiesNet	$ (8)us-gaap_GainLossOnSaleOfSecuritiesNet	$ 10,670us-gaap_GainLossOnSaleOfSecuritiesNet	$ 9us-gaap_GainLossOnSaleOfSecuritiesNet	$ 41us-gaap_GainLossOnSaleOfSecuritiesNet	$ 3,958us-gaap_GainLossOnSaleOfSecuritiesNet	$ 745us-gaap_GainLossOnSaleOfSecuritiesNet	$ 14,678us-gaap_GainLossOnSaleOfSecuritiesNet	$ 2,587us-gaap_GainLossOnSaleOfSecuritiesNet