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Investment Securities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Securities
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Securities issued by U.S. government percentage 78.00%    
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
Gross unrealized holding losses 0    
Book value of the bond 1,777,000 2,050,000  
Credit-related impairment loss on investment securities held-to-maturity     656,000
Average life of investment grade debt securities, years 4 years 4 months 24 days    
Investment securities pledged as collateral 2,600,000,000 2,240,000,000  
Investment in FHLB stock, impairment losses 0    
Government agency [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Agency bond callable 142,100,000    
CMO/REMICs [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
CMO/REMIC's backed by whole loans issued by private-label companies (non-government sponsored) 560,000    
Investment security classified as held-to-maturity, number 1    
Held-to-Maturity securities, average FICO score 715    
Held-to-Maturity securities, acquired price, percentage 98.25%    
Average percentage of LTV 71.00%    
Current fair value percentage of Held-to-Maturity security against par value 0.76%    
Investment contractual cash flows guaranteed by Government, percentage 99.97%    
Investment contractual cash flows guaranteed by banks, percentage 0.03%    
Alt-A bond [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Book value of the bond 1,800,000    
Net impairment losses $ 1,900,000    
Municipal bonds [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Average life of investment grade debt securities, years 8 years 8 months 12 days