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Securities Available for Sale - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Company recorded impairment charges       $ 193,000   
Additional credit impairment 0   0  
Proceeds from the sale of securities     563,000 1,800,000
Gross realized gains from sale of securities    198,000 288,000 467,000
Gross realized losses     0 0
Credit-related Securities [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company recorded impairment charges     193,000  
Noncredit Related Securities [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company recorded impairment charges     0  
Trust Preferred Securities [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company recorded impairment charges     2,300,000  
Preferred security, remaining book value $ 0   $ 0