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Consolidated Statements of Financial Condition (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Investment securities held to maturity $ 1,815,976us-gaap_HeldToMaturitySecuritiesFairValue $ 1,711,427us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, par value (in dollars per share)      
Preferred stock, shares authorized 30,000,000us-gaap_PreferredStockSharesAuthorized 30,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share)      
Common stock, shares authorized 332,023,233us-gaap_CommonStockSharesAuthorized 199,629,268us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 232,127,098us-gaap_CommonStockSharesIssued 199,629,268us-gaap_CommonStockSharesIssued
Treasury stock, shares 16,123us-gaap_TreasuryStockShares 36,159us-gaap_TreasuryStockShares