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DEBT SECURITIES HELD BY SAVINGS BANK SUBSIDIARY. (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Jun. 30, 2013
security
Investments with temporary impairment (0 securities in 2013) of (fair values)    
Total fair value $ 136,000,000 $ 127,400,000
Aggregate cost 132,800,000 125,600,000
Debt securities held by savings bank subsidiary [Member]
   
Investments with temporary impairment (0 securities in 2013) of (fair values)    
Investments with temporary impairment (number of securities)   0
Fair value of investments with temporary impairment of less than 12 months 6,400,000 0
Fair value of investments with temporary impairment of 12 months or more 1,000,000 0
Total fair value of investments with temporary impairment 7,400,000 0
Fair value of investments with unrealized holding gains 128,600,000 127,400,000
Investments with temporary impairment (0 securities in 2013) of (unrealized holding gains (losses))    
Unrealized holding losses on investments with temporary impairment of less than 12 months 0 0
Unrealized holding losses on investments with temporary impairment of 12 months or more 0 0
Total unrealized holding losses on investments with temporary impairment 35,000 0
Unrealized holding gains 3,200,000 1,800,000
Total unrealized holding gains (losses) $ 3,200,000 $ 1,800,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause The unrealized losses in these investments at December 31, 2012 totaled $35,000. These losses 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 intended to hold these securities to their maturities and believed it was more-likely-than-not that we would not be required to sell any of these securities before recovery of their amortized cost. Accordingly, impairment of these investments was considered temporary.