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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended
Oct. 16, 2009
Sep. 30, 2014
Plans
Oct. 16, 2009
Summary Of Significant Accounting Policies [Line Items]      
Number of days on which collection of interest on principal is no longer probable   90 days  
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status   6 months  
Original terms of modified loans   6 months  
Number of days on which charge-offs unsecured consumer loans are recorded   120 days  
Minimum loan amount for credit review process   $ 1,000,000  
Allowance for loan losses look-back period, revised   Rolling twenty quarters  
Agreed percentage of losses in loss sharing agreement     80.00%
Loss amount with respect to covered assets 26,700,000    
Agreed percentage of reimbursement in loss sharing agreement 95.00%    
Goodwill impairment   0  
Number of stock-based employee compensation plans   3  
Previously Reported [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Allowance for loan losses look-back period, previous   3 years  
Commercial Loans [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Loss sharing agreement term 5 years    
Loss recovery provisions term 8 years    
Single-family Residential Loans [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Loss sharing agreement term 10 years    
Loss recovery provisions term 10 years    
Minimum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Number of days over which principal or interest payments are past due to consider non-covered loans   30 days  
Number of days for which principal or interest payments on non-covered loans remain accrual   30 days  
Length of modified debt term   3 months  
Maximum [Member]
      
Summary Of Significant Accounting Policies [Line Items]      
Number of days for which principal or interest payments on non-covered loans remain accrual   89 days  
Length of modified debt term   12 months  
Loss recoveries on covered assets $ 144,000,000