Annual report pursuant to Section 13 and 15(d)

Deposits - Additional Information (Detail)

v2.4.0.6
Deposits - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deposits [Line Items]    
Accrued interest payable on deposits $ 3,500,000 $ 6,200,000
Total deposits reclassified to loans due to overdrafts 1,800,000 2,400,000
Time deposits of more than $250,000 238,200,000  
Maximum deposit insurance amount increased $ 250,000