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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 16, 2009
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Plans
Sep. 30, 2012
Dec. 31, 2012
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    
Maximum loan amount for credit review process       $ 1,000,000    
Agreed percentage of loss in loss sharing agreement 80.00%          
Loss recoveries on covered assets 144,000,000          
Loss amount with respect to covered assets 26,700,000          
Agreed percentage of reimbursement in loss reimburse agreement 95.00%          
Goodwill impairment       0    
Goodwill   55,097,000   55,097,000   55,097,000
Core deposit and premiums   2,386,000   2,386,000   3,389,000
Accumulated amortization   29,600,000   29,600,000    
Amortization of intangible assets   127,000 449,000 1,002,000 1,717,000  
Estimated amortization expense remainder of 2013   124,000   124,000    
Estimated amortization expense for 2014   475,000   475,000    
Estimated amortization expense for 2015   437,000   437,000    
Estimated amortization expense for 2016   395,000   395,000    
Estimated amortization expense for 2017   366,000   366,000    
Estimated amortization expense from 2018 to 2019   $ 589,000   $ 589,000    
Approximately weighted average remaining life of intangible assets       2 years    
Number of stock-based compensation plans       3    
Commercial loans [Member]
            
Loss sharing agreement term 5 years          
Loss recovery provision term 8 years          
Single-family residential loans [Member]
            
Loss sharing agreement term 10 years          
Loss recovery provision term 10 years          
Minimum [Member]
            
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]
            
Number of days for which principal or interest payments on non-covered loans remain accrual       89 days    
Length of modified debt term       12 months