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Regulatory Enforcement Action - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
May 31, 2011
Call Loans And Funds Sold And Call Money And Funds Purchased [Line Items]              
Reduction of classified assets percentage within six months             75.00%
Reduction of classified assets amount within six months         $ 219.0    
Reduction of classified assets percentage within twelve months             50.00%
Reduction of classified assets amount within twelve months   $ 146.0          
Tier 1 leverage capital ratio 10.26%   8.50% 8.70%   9.00%  
Total risk-based capital ratio 19.78%   12.00%     12.00%