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Consolidated Statements of Financial Condition (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Held-to-maturity securities, fair value (in dollars) $ 2,137,907us-gaap_HeldToMaturitySecuritiesFairValue $ 2,131,371us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, par value (in dollars per share) $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 166,494,888us-gaap_CommonStockSharesIssued 166,494,888us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 100,396,907us-gaap_CommonStockSharesOutstanding 99,940,399us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 66,097,981us-gaap_TreasuryStockShares 66,554,489us-gaap_TreasuryStockShares
Series C Preferred Stock    
Preferred stock, shares authorized 150,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
150,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Preferred stock, shares issued 135,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
135,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Preferred stock, shares outstanding 135,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
135,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember