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Investment Securities - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Securities
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]            
Number of securities     13      
Investment securities, par value     $ 94,200,000      
Pre-tax gain on sale of securities         2,094,000  
Gains (loss) recognized 0     0    
Average life of investment grade debt securities, years       4 years 2 months 12 days    
Gross unrealized holding losses 0     0    
Book value of the bond 1,598,000     1,598,000   1,777,000
Credit-related impairment loss on investment securities held-to-maturity 0 0   0 0  
Investment securities pledged as collateral 3,130,000,000     3,130,000,000   2,600,000,000
Investment in FHLB stock, impairment losses 0     0    
Government agency [Member]
            
Schedule of Available-for-sale Securities [Line Items]            
Agency bond callable       137,200,000    
United States [Member]
            
Schedule of Available-for-sale Securities [Line Items]            
Securities issued by U.S. government percentage 81.00%     81.00%    
CMOs / REMICs - residential [Member]
            
Schedule of Available-for-sale Securities [Line Items]            
CMO/REMICs backed by whole loans issued by private-label companies (non-government sponsored) 388,000     388,000    
Investment security classified as held-to-maturity, number 1     1    
Held-to-Maturity securities, average FICO score 715     715    
Held-to-Maturity securities, acquired price, percentage 98.25%     98.25%    
Average percentage of LTV 71.00%     71.00%    
Average life of investment grade debt securities, years       30 years    
Current fair value percentage of Held-to-Maturity security against par value 79.27%     79.27%    
Investment contractual cash flows guaranteed by Government, percentage 99.98%     99.98%    
Investment contractual cash flows guaranteed by banks, percentage 0.02%     0.02%    
Alt-A bond [Member]
            
Schedule of Available-for-sale Securities [Line Items]            
Book value of the bond 1,600,000     1,600,000    
Net impairment losses $ 1,900,000     $ 1,900,000    
Municipal bonds [Member]
            
Schedule of Available-for-sale Securities [Line Items]            
Average life of investment grade debt securities, years       8 years 7 months 6 days