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Securities - Summary of Cumulative Credit-Related OTTI Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance $ 17,182 $ 17,367
Loss where impairment was not previously recognized      
Additional loss where impairment was previously recognized      
Reduction due to credit impaired securities sold (17,155) (212)
Ending balance 27 17,155
Collateralized Debt Obligations [Member]
    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance 17,155 17,155
Loss where impairment was not previously recognized      
Additional loss where impairment was previously recognized      
Reduction due to credit impaired securities sold (17,155)   
Ending balance    17,155
Residential Non-Agency Collateralized Mortgage Obligations [Member]
    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance    212
Loss where impairment was not previously recognized      
Additional loss where impairment was previously recognized      
Reduction due to credit impaired securities sold    (212)
Ending balance      
Equity Securities [Member]
    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance 27   
Loss where impairment was not previously recognized      
Additional loss where impairment was previously recognized      
Reduction due to credit impaired securities sold      
Ending balance $ 27