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Classification and carrying amount of pledged assets, in which the secured parties are not permitted to sell or repledge the collateral (Detail) - Entity [Domain] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total pledged assets $ 11,245,137 $ 11,061,980
Available For Sale Securities Member    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Assets in which the Secured Parties are Not Permitted to Sell or Repledge the Collateral 2,286,368 1,700,820
Held To Maturity Securities Member    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Assets in which the Secured Parties are Not Permitted to Sell or Repledge the Collateral 58,910 60,515
Loans Held For Sale [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Assets in which the Secured Parties are Not Permitted to Sell or Repledge the Collateral 0 0
Loans Held For Investment [Member] | Covered Loans [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Assets in which the Secured Parties are Not Permitted to Sell or Repledge the Collateral 411,597 480,441
Loans Held For Investment [Member] | Non Covered Loans [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Pledged Assets in which the Secured Parties are Not Permitted to Sell or Repledge the Collateral $ 8,488,262 $ 8,820,204