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DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY. (Customer Deposits) (Detail) (USD $)
In Millions
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Maturities of customer deposit liabilities Up to five years Up to five years
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Estimated fair value of customer deposit liability, basis for measurement
The estimated fair value of our customer deposit liability, based on discounting expected cash outflows at maturity dates that range up to five years, using current interest rates offered for deposits with the same dates of maturity, was $164.1 million at December 31, 2010, and $170.1 million at June 30, 2011.
 
Estimated fair value of customer deposit liability $ 170.1 164.1