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Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Prepayment rates [Member] | Sep. 30, 2012 Discount rates [Member] | Sep. 30, 2012 Minimum [Member] Probability of default [Member] | Sep. 30, 2012 Minimum [Member] Prepayment rates [Member] | Sep. 30, 2012 Maximum [Member] Probability of default [Member] | Sep. 30, 2012 Maximum [Member] Prepayment rates [Member] | Sep. 30, 2012 Weighted average [Member] Probability of default [Member] | Sep. 30, 2012 Weighted average [Member] Prepayment rates [Member] | Sep. 30, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Sep. 30, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Probability of default [Member] | Sep. 30, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Minimum [Member] Discount rates [Member] | Sep. 30, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Maximum [Member] Discount rates [Member] | Sep. 30, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] | Sep. 30, 2012 Other Investments [Member] | Sep. 30, 2012 Other Investments [Member] Par Value [Member] | Sep. 30, 2012 Interest Rate Swap [Member] | Sep. 30, 2012 Interest Rate Swap [Member] Counterparty credit risk [Member] | Sep. 30, 2012 Interest Rate Swap [Member] Minimum [Member] | Sep. 30, 2012 Interest Rate Swap [Member] Maximum [Member] | Sep. 30, 2012 Interest Rate Swap [Member] Option model [Member] | Sep. 30, 2012 Impaired Loans [Member] | Sep. 30, 2012 Impaired Loans [Member] Discount rates [Member] | Sep. 30, 2012 Impaired Loans [Member] Minimum [Member] | Sep. 30, 2012 Impaired Loans [Member] Maximum [Member] | Sep. 30, 2012 Impaired Loans [Member] Discounted Cash Flow [Member] | Sep. 30, 2012 Other Real Estate Owned [Member] | Sep. 30, 2012 Other Real Estate Owned [Member] Counterparty credit risk [Member] | Sep. 30, 2012 Other Real Estate Owned [Member] Internal Valuation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate |  |  |  |  | 0.00% | 0.00% | 100.00% | 100.00% | 21.73% | 13.44% |  |  | 6.75% | [1] | 20.00% | [1] |  |  |  |  |  | 15.08% | [2] | 17.63% | [2] |  |  |  |  | 8.42% | 8.83% |  |  |  |
Unobservable Inputs |  |  | Prepayment rates | Discount rates |  |  |  |  |  |  |  | Probability of default |  |  |  |  |  |  |  |  | Counterparty credit risk |  |  |  |  |  |  |  | Discount rate |  |  |  |  |  |
Valuation Technique |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Discounted Cash Flow |  | Par Value |  |  |  |  |  |  | Option model |  |  |  |  |  | Discounted Cash Flow |  |  | Internal Valuation
Fair Value | $ 1,181,423 | $ 1,212,048 |  |  |  |  |  |  |  |  | $ 23,051 |  |  |  |  |  |  | $ 1,420 |  | $ 0 |  |  |  |  |  |  | $ 15,755 | [3] |  |  |  |  | $ 338 |  |
[1] | incorporates premium related to credit quality and illiquidity of securities.
[2] | represents the range of the credit spread curve used in valuation.
[3] | the remainder of impaired loans valued using Level 3 inputs are not included in this disclosure as the values of those loans are based on bankruptcy agreement documentation

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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