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Acquisitions (Narrative) (Details) (USD $)
Dec. 31, 2011
Oct. 14, 2011
Charter Bank [Member]
branches
Dec. 16, 2011
Western National Bank [Member]
branches
Dec. 31, 2011
Fair Value Adjustments [Member]
Dec. 16, 2011
Fair Value Adjustments [Member]
Western National Bank [Member]
Dec. 31, 2011
Received from FDIC [Member]
Dec. 16, 2011
Received from FDIC [Member]
Western National Bank [Member]
Business Acquisition [Line Items]              
Number of branches acquired   6 3        
Deposits acquired   $ 254,000,000 $ 136,000,000        
Acquisition from FDIC, deposits assumed     53,000,000        
Assets acquired 124,726,000   177,000,000 (52,009,000)   176,735,000  
Loans acquired     143,000,000        
Foreclosed real estate acquired     7,000,000        
Liabilities assumed 154,500,000   153,000,000 1,004,000   153,496,000  
Cash received from the FDIC 29,774,000   30,000,000        
Net assets (liabilities) acquired $ (29,774,000)     $ (53,013,000) $ 53,000,000 $ 23,239,000 $ 23,000,000