Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Additional Information (Detail)

v2.4.0.8
Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income [Line Items]    
Net realized gain (loss) on redemption or sale of investment securities $ 1,421,000 $ 9,000
Net unrealized gain (loss) on available-for-sale securities and interest only strip 5,300,000 314,000
Net gain on sales of investment securities 1,421,000 9,000
Recognized in earnings resulting from the redemption of investment securities 59,000 34,000
Other-than-temporary impairment loss on investment securities 0  
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 1,400,000 9,000
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   $ 34,000