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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings $ 488,043 $ 328,748
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 377,808 192,500
Fair Value of Underlying Collateral 402,225 205,483
Securities Sold under Agreements to Repurchase [Member] | JP Morgan Chase Bank NA [Member]    
Debt Instrument [Line Items]    
Borrowings 130,000 82,500
Fair Value of Underlying Collateral 140,364 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 116,432 116,509
Securities Sold under Agreements to Repurchase [Member] | Nomura Securities International, Inc [Member]    
Debt Instrument [Line Items]    
Borrowings 53,294 0
Fair Value of Underlying Collateral 56,199 0
Securities Sold under Agreements to Repurchase [Member] | Citigroup Global Markets Inc.[Member]    
Debt Instrument [Line Items]    
Borrowings 39,989 0
Fair Value of Underlying Collateral 42,524 0
Securities Sold under Agreements to Repurchase [Member] | JVB Financial Group, LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 32,525 0
Fair Value of Underlying Collateral 34,116 $ 0
Securities Sold under Agreements to Repurchase [Member] | South Street Securities, LLC [Member]    
Debt Instrument [Line Items]    
Borrowings 12,000  
Fair Value of Underlying Collateral $ 12,590