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DEBT SECURITIES HELD BY SAVINGS BANK SUBSIDIARY. (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
security
Dec. 31, 2011
Investments with temporary impairment (14 securities in 2012) of (fair values)    
Total fair value $ 158.0 $ 198.4
Aggregate cost 154.1 195.3
Debt securities held by savings bank subsidiary [Member]
   
Investments with temporary impairment (14 securities in 2012) of (fair values)    
Investments with temporary impairment (number of securities) 14  
Less than 12 months 4.2 22.8
12 months or more 1.1 6.3
Total fair value of investments with temporary impairment 5.3 29.1
Fair value of investments with unrealized holding gains 152.7 169.3
Investments with temporary impairment (14 securities in 2012) of (unrealized holding gains (losses))    
Less than 12 months 0 (0.2)
12 months or more 0 (0.2)
Total unrealized holding losses on investments with temporary impairment 0 (0.4)
Unrealized holding gains 3.9 3.5
Total unrealized holding gains (losses) $ 3.9 $ 3.1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause The unrealized losses in these investments were generally caused by changes in interest rates and market liquidity, and not by changes in credit quality.  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other We intend to hold these securities to their maturities, which generally correlate to the maturities of our customer deposits, and believe it is more-likely-than-not that we will not be required to sell any of these securities before recovery of their amortized cost. Accordingly, impairment of these investments is considered temporary.