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Business Combinations (Details) (First Community Bank of New Mexico [Member], USD $)
6 Months Ended
Jun. 30, 2011
First Community Bank of New Mexico [Member]
 
Business Combinations (Textuals) [Abstract]  
Number of branches acquired 38
Value of Asset acquired $ 2,100,000,000
Value of liability acquired 2,100,000,000
Total cash acquired 412,000,000
Gain on the transaction $ 46,000,000