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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 |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Probability of default [Member] Minimum [Member] | Dec. 31, 2012 Probability of default [Member] Maximum [Member] | Dec. 31, 2012 Probability of default [Member] Weighted average [Member] | Dec. 31, 2012 Prepayment rates [Member] | Dec. 31, 2012 Prepayment rates [Member] Minimum [Member] | Dec. 31, 2012 Prepayment rates [Member] Maximum [Member] | Dec. 31, 2012 Prepayment rates [Member] Weighted average [Member] | Dec. 31, 2012 Discount rates [Member] | Dec. 31, 2012 Gas per MCF [Member] | Dec. 31, 2012 Gas per MCF [Member] Minimum [Member] | Dec. 31, 2012 Gas per MCF [Member] Maximum [Member] | Dec. 31, 2012 Oil per BBL/d [Member] | Dec. 31, 2012 Oil per BBL/d [Member] Minimum [Member] | Dec. 31, 2012 Oil per BBL/d [Member] Maximum [Member] | Dec. 31, 2012 NGL per gallon [Member] | Dec. 31, 2012 NGL per gallon [Member] Weighted average [Member] | Dec. 31, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] | Dec. 31, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Probability of default [Member] | Dec. 31, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discount rates [Member] Minimum [Member] | Dec. 31, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discount rates [Member] Maximum [Member] | Dec. 31, 2012 Pooled Trust Preferred Collateralized Debt Obligations [Member] Discounted Cash Flow [Member] | Dec. 31, 2012 Other Investments [Member] | Dec. 31, 2012 Other Investments [Member] Par Value [Member] | Dec. 31, 2012 Interest rate swap [Member] | Dec. 31, 2012 Interest rate swap [Member] Minimum [Member] | Dec. 31, 2012 Interest rate swap [Member] Maximum [Member] | Dec. 31, 2012 Interest rate swap [Member] Counterparty credit risk [Member] | Dec. 31, 2012 Interest rate swap [Member] Option model [Member] | Dec. 31, 2012 Impaired Loans [Member] | Dec. 31, 2012 Impaired Loans [Member] Weighted average [Member] | Dec. 31, 2012 Impaired Loans [Member] Discount rates [Member] | Dec. 31, 2012 Impaired Loans [Member] Reserve study [Member] | Dec. 31, 2012 Other Real Estate Owned [Member] | Dec. 31, 2012 Other Real Estate Owned [Member] Counterparty credit risk [Member] | Dec. 31, 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% | 100.00% | 21.95% |  | 0.00% | 100.00% | 12.20% |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 20.00% |  |  |  |  | 9.66% | 11.95% |  |  |  | 10.00% |  |  |  |  |
Weighted average |  |  |  |  |  |  |  |  |  |  |  | 2.92 | 5.48 |  | 84.64 | 96.86 |  | 1.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unobservable Inputs |  |  |  |  |  | Prepayment rates |  |  |  | Discount rates | Gas per MCF |  |  | Oil per BBL/d |  |  | NGL per gallon |  |  | Probability of default |  |  |  |  |  |  |  |  | Counterparty credit risk |  |  |  | Discount rate |  |  |  |
Valuation Technique |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Discounted Cash Flow |  | Par Value |  |  |  |  | Option model |  |  |  | Reserve study |  |  | Internal Valuation
Fair Value | $ 1,216,011 | $ 1,212,048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,373 |  |  |  |  | $ 1,420 |  | $ 0 |  |  |  |  | $ 751 |  |  |  | $ 247 |  |

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- Definition Fair Value Weighted Average Inputs Price + References No definition available. + Details
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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
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- Details
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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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