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Branch Sale - Summary of Non Cash Amounts Recognized in Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Assets          
Cash and cash equivalents $ 69,060   $ 102,952 $ 117,796 $ 223,017
Other loans held for sale 7,088 16,224 14,178    
Liabilities          
Total deposits 1,016,229   1,064,181    
Branches Under Contract For Sale [Member]
         
Assets          
Cash and cash equivalents 643        
Other loans held for sale 7,508        
Long-lived assets held for sale 664        
Liabilities          
Transaction deposits 12,641        
Money market deposits 3,550        
Savings deposits 2,141        
Time deposits 22,763        
Total deposits $ 41,095