Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Additional Information (Detail)

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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Accumulated Other Comprehensive Income [Line Items]          
Net realized gain (loss) on redemption or sale of investment securities $ 364,000 $ 303,000 $ 1,785,000 $ 312,000  
Net unrealized gain (loss) on available-for-sale securities and interest only strip 3,700,000 3,200,000 9,000,000 3,500,000  
Net gain on sales of investment securities 364,000 303,000 1,785,000 312,000  
Recognized in earnings resulting from the redemption of investment securities 100,000 812,000 177,000 856,000  
Other-than-temporary impairment loss on investment securities     0   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 364,000 303,000 1,800,000 312,000  
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   $ 812,000   $ 856,000