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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Borrowings $ 627,292 $ 795,354
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 452,850 652,229
Fair Value of Underlying Collateral 483,410 700,498
Securities Sold under Agreements to Repurchase [Member] | Nomura [Member]    
Debt Instrument [Line Items]    
Borrowings 37,001 0
Fair Value of Underlying Collateral 38,900 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 239,781 350,219
Fair Value of Underlying Collateral 257,976 376,674
Securities Sold under Agreements to Repurchase [Member] | Federal Home Loan Bank    
Debt Instrument [Line Items]    
Borrowings 110,000 0
Fair Value of Underlying Collateral 115,881 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 66,068 0
Fair Value of Underlying Collateral $ 70,653 $ 0