Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income - Additional Information (Detail)

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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income [Line Items]      
Net realized gain (loss) on redemption or sale of investment securities $ 1,039,000 $ 1,104,000 $ 1,635,000
Net gain on sales of investment securities 1,039,000 1,396,000 1,635,000
Recognized in earnings resulting from the redemption of investment securities 3,300,000 1,700,000  
Net realized gain (loss) on redemption or sale of investment securities 1,039,000 1,397,000 1,635,000
Gain (loss) on Reclassification from other comprehensive loss to OTTI charge in earnings   292,000  
Other-than-temporary impairment loss on investment securities 0 292,000  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
      
Accumulated Other Comprehensive Income [Line Items]      
Net gain on sales of investment securities 1,000,000 1,400,000  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
      
Accumulated Other Comprehensive Income [Line Items]      
Other-than-temporary impairment loss on investment securities   $ 292,000