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SAVINGS BANK SUBSIDIARY. (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2013
Savings bank subsidiary [Member]
May 23, 2013
Savings bank subsidiary [Member]
Dec. 31, 2012
Savings bank subsidiary [Member]
Assets and liabilities held for sale              
Capital stock sold (percentage)           100.00%  
Portion of sale price in excess of net book value           $ 500,000  
Cash and cash equivalents 1,455,900,000 879,100,000 972,300,000 897,900,000 41,400,000   44,300,000
Debt securities 127,400,000 136,000,000     127,400,000   136,000,000
Other assets 110,300,000 162,300,000     100,000   400,000
Total assets held for sale 4,798,900,000 4,202,800,000     168,900,000   180,700,000
Accounts payable and accrued expenses 114,400,000 89,700,000     0   100,000
Income taxes payable 17,600,000 21,500,000     700,000   1,300,000
Customer deposits 144,600,000 154,700,000     144,600,000   154,700,000
Total liabilities held for sale $ 488,400,000 $ 356,700,000     $ 145,300,000   $ 156,100,000