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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Borrowings $ 419,254 $ 795,354
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 282,500 652,229
Fair Value of Underlying Collateral 301,684 700,498
Securities Sold under Agreements to Repurchase [Member] | Nomura [Member]    
Debt Instrument [Line Items]    
Borrowings 0 0
Fair Value of Underlying Collateral 0 0
Securities Sold under Agreements to Repurchase [Member] | PR Money Market Market Fund    
Debt Instrument [Line Items]    
Borrowings 0 70,010
Fair Value of Underlying Collateral 0 74,538
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 172,500 350,219
Fair Value of Underlying Collateral 185,848 376,674
Securities Sold under Agreements to Repurchase [Member] | Federal Home Loan Bank    
Debt Instrument [Line Items]    
Borrowings 110,000 0
Fair Value of Underlying Collateral 115,836 0
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 0 232,000
Fair Value of Underlying Collateral 0 249,286
Securities Sold under Agreements to Repurchase [Member] | Goldman Sachs [Member]    
Debt Instrument [Line Items]    
Borrowings 0 0
Fair Value of Underlying Collateral $ 0 $ 0