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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 |  |  |  |  |  |  |  |  | $ 2,257 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 553 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 723 us-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 | $ 320 us-gaap_GainLossOnSaleOfSecuritiesNet | $ (59)us-gaap_GainLossOnSaleOfSecuritiesNet | $ 45 us-gaap_GainLossOnSaleOfSecuritiesNet | $ 208 us-gaap_GainLossOnSaleOfSecuritiesNet | $ (39)us-gaap_GainLossOnSaleOfSecuritiesNet | $ 113 us-gaap_GainLossOnSaleOfSecuritiesNet | $ 117 us-gaap_GainLossOnSaleOfSecuritiesNet | $ (1,385)us-gaap_GainLossOnSaleOfSecuritiesNet | $ 399 us-gaap_GainLossOnSaleOfSecuritiesNet | $ 483 us-gaap_GainLossOnSaleOfSecuritiesNet

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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 + Details
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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 + Details
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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 + Details
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