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Securities - Summary of Structured Pooled Trust Preferred Securities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost $ 800    
Unrealized Gain (Loss) (139)    
Fair Value 661    
Credit Losses Realized in Earnings 0 0 398
ALESCO Preferred Funding V, Ltd [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 800    
Unrealized Gain (Loss) (139)    
Fair Value 661    
Credit Losses Realized in Earnings 0 0 0
ALESCO Preferred Funding XII, Ltd [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 0    
Unrealized Gain (Loss) 0    
Fair Value 0    
Credit Losses Realized in Earnings 0 0 280
ALESCO Preferred Funding XVII, Ltd [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 0    
Unrealized Gain (Loss) 0    
Fair Value 0    
Credit Losses Realized in Earnings 0 0 0
Preferred Term Securities XVI, Ltd [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 0    
Unrealized Gain (Loss) 0    
Fair Value 0    
Credit Losses Realized in Earnings 0 0 118
US Capital Funding VI, Ltd. [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 0    
Unrealized Gain (Loss) 0    
Fair Value 0    
Credit Losses Realized in Earnings $ 0 $ 0 $ 0