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Impairment of Investment Securities - Pooled Trust Preferred Collateralized Debt Obligations (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL IV [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL V [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL VII [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL VIII [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL IX [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL X [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL XII [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL XIII [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] Pre TSL XIV [Member] Bank | Mar. 31, 2014 Pooled Trust Preferred Collateralized Debt Obligations [Member] Mezzanine [Member] MMCap I [Member] Bank
Impairment Of Investment Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Book Value |  |  | $ 42,214 | $ 1,830 | $ 58 | $ 2,636 | $ 1,985 | $ 2,313 | $ 1,409 | $ 5,410 | $ 12,408 | $ 13,720 | $ 445
Securities available for sale, at fair value | 1,351,039 | 1,318,365 | 27,876 | 1,297 | 28 | 2,609 | 1,400 | 1,390 | 1,391 | 3,311 | 7,941 | 8,146 | 363
Unrealized Gain (Loss) |  |  | $ (14,338) | $ (533) | $ (30) | $ (27) | $ (585) | $ (923) | $ (18) | $ (2,099) | $ (4,467) | $ (5,574) | $ (82)
Debt Instrument, Credit Rating |  |  |  | B1/B | C/- | Ca/C | C/C | Caa1/C | Caa3/C | Caa3/C | Caa3/C | Ca/C | Ca/C
Number of Banks (in banks) |  |  |  | 6 | 3 | 14 | 30 | 42 | 46 | 68 | 61 | 58 | 11
Deferrals and Defaults as a % of Current Collateral |  |  |  | 18.05% | 100.00% | 54.14% | 54.77% | 28.05% | 35.07% | 30.28% | 27.78% | 31.90% | 58.76%
Excess Subordination as a % of Current Performing Collateral |  |  |  | 55.72% | 0.00% | 0.00% | 0.00% | 7.86% | 0.00% | 0.00% | 19.84% | 50.44% | 14.63%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale 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 (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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