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SUBSEQUENT EVENTS (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Aug. 07, 2013
Subsequent event
Aug. 01, 2013
Subsequent event
Jul. 22, 2013
Subsequent event
Capital Source
item
Subsequent events                
Quarterly cash dividends declared per common share (in dollars per share) $ 0.25 $ 0.25 $ 0.18 $ 0.50 $ 0.36 $ 0.25    
Purchase price               $ 2,300,000,000
Cash receivable by stockholders of acquiree for each share of acquiree               $ 2.47
Number of shares of the entity receivable by stockholders of acquiree for each share of acquiree               0.2837
Closing stock price (in dollars per share)             $ 36.17  
Shares acquired (in dollars per share)               $ 12.73
Pro forma consolidated assets               $ 15,400,000,000
Pro forma consolidated branches               96