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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings $ 552,266 $ 328,748
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 387,379 192,500
Fair Value of Underlying Collateral 412,677 205,483
Securities Sold under Agreements to Repurchase [Member] | KGS Alpha [Member]    
Debt Instrument [Line Items]    
Borrowings 12,460 0
Fair Value of Underlying Collateral 13,855 0
Securities Sold under Agreements to Repurchase [Member] | JP Morgan Chase Bank [Member]    
Debt Instrument [Line Items]    
Borrowings 80,000 82,500
Fair Value of Underlying Collateral 86,252 88,974
Securities Sold under Agreements to Repurchase [Member] | FHLB [Member]    
Debt Instrument [Line Items]    
Borrowings 110,000 110,000
Fair Value of Underlying Collateral 116,330 116,509
Securities Sold under Agreements to Repurchase [Member] | Amherst Pierpont [Member]    
Debt Instrument [Line Items]    
Borrowings 46,427 0
Fair Value of Underlying Collateral 48,966 0
Securities Sold under Agreements to Repurchase [Member] | Nomura [Member]    
Debt Instrument [Line Items]    
Borrowings 60,000 0
Fair Value of Underlying Collateral 63,464 0
Securities Sold under Agreements to Repurchase [Member] | Citigroup [Member]    
Debt Instrument [Line Items]    
Borrowings 49,970 0
Fair Value of Underlying Collateral 53,249 0
Securities Sold under Agreements to Repurchase [Member] | JVB Financial [Member]    
Debt Instrument [Line Items]    
Borrowings 28,522 0
Fair Value of Underlying Collateral $ 30,561 $ 0