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Securities - Summary of Structured Pooled Trust Preferred Securities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost $ 800    
Unrealized Gain (Loss) 1,249    
Fair Value 2,049    
Credit Losses Realized in Earnings 0 $ 0 $ 0
ALESCO Preferred Funding V, Ltd [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Adjusted Amortized Cost 800    
Unrealized Gain (Loss) 330    
Fair Value 1,130    
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) 919    
Fair Value 919    
Credit Losses Realized in Earnings 0 0 0
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