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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 3,000,000us-gaap_PreferredStockSharesAuthorized 3,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 105,563,455us-gaap_CommonStockSharesIssued 105,563,455us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 91,723,028us-gaap_CommonStockSharesOutstanding 95,245,215us-gaap_CommonStockSharesOutstanding
Treasury stock, shares (in shares) 13,840,427us-gaap_TreasuryStockShares 10,318,240us-gaap_TreasuryStockShares