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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 800,299 $ 1,371,534
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 656,635 932,500
Fair Value of Underlying Collateral 705,961 1,021,370
Securities Sold under Agreements to Repurchase [Member] | Federal Home Loan Bank of NY [Member]    
Debt Instrument [Line Items]    
Borrowings 42,135 0
Fair Value of Underlying Collateral 44,883 0
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 212,500 262,500
Fair Value of Underlying Collateral 231,967 283,483
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 402,000 670,000
Fair Value of Underlying Collateral $ 429,111 $ 737,887