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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 795,354 $ 1,371,534
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 652,229 932,500
Fair Value of Underlying Collateral 700,498 1,021,370
Securities Sold under Agreements to Repurchase [Member] | PR Money Market Market Fund    
Debt Instrument [Line Items]    
Borrowings 70,010 0
Fair Value of Underlying Collateral 74,538 0
Securities Sold under Agreements to Repurchase [Member] | Jp Morgan Chase Bank Na [Member]    
Debt Instrument [Line Items]    
Borrowings 350,219 262,500
Fair Value of Underlying Collateral 376,674 283,483
Securities Sold under Agreements to Repurchase [Member] | Credit Suisse Securities LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 232,000 670,000
Fair Value of Underlying Collateral $ 249,286 $ 737,887