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Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Minimum [Member]
Discount rates [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Maximum [Member]
Discount rates [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Minimum [Member]
Probability of default [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Minimum [Member]
Prepayment rates [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Maximum [Member]
Probability of default [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Maximum [Member]
Prepayment rates [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Weighted average [Member]
Probability of default [Member]
Mar. 31, 2013
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discounted Cash Flow [Member]
Weighted average [Member]
Prepayment rates [Member]
Mar. 31, 2013
Equity Securities [Member]
Dec. 31, 2012
Interest Rate Swap [Member]
Mar. 31, 2013
Interest Rate Swap [Member]
Option model [Member]
Minimum [Member]
Counterparty credit risk [Member]
Mar. 31, 2013
Interest Rate Swap [Member]
Option model [Member]
Maximum [Member]
Counterparty credit risk [Member]
Mar. 31, 2013
Impaired Loans [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
NGL per gallon [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
Minimum [Member]
Gas per MCF [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
Minimum [Member]
Oil per BBL/d [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
Maximum [Member]
Gas per MCF [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
Maximum [Member]
Oil per BBL/d [Member]
Mar. 31, 2013
Impaired Loans [Member]
Reserve Study [Member]
Weighted average [Member]
Discount rates [Member]
Mar. 31, 2013
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                            
Assets $ 1,216,011,000 $ 24,512,000                 $ 1,420,000 $ 0     $ 734,000 [1]             $ 215,000
Weighted average rate     6.25% [2] 18.00% [2] 0.00% 0.00% 100.00% 81.75% 21.44% 9.60%     8.56% [3] 10.31% [3]             10.00% [3]  
Fair Value Inputs Monetary                               $ 1.54 [4] $ 3.67 [4] $ 90.97 [4] $ 7.60 [4] $ 106.00 [4]    
[1] 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.
[2] incorporates spread over risk free rate related primarily to credit quality and illiquidity of securities.
[3] represents the range of the credit spread curve used in valuation.
[4] unobservable inputs are defined as follows: MCF - million cubic feet; BBL/d - barrels per day; NGL - natural gas liquid.