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Borrowings (Securities Sold Under Agreement to Repurchase by Counterparties) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings $ 354,337 $ 328,748
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Borrowings 273,500 192,500
Fair Value of Underlying Collateral 293,068 205,483
Securities Sold under Agreements to Repurchase [Member] | KGS Alpha [Member]    
Debt Instrument [Line Items]    
Borrowings 11,000 0
Fair Value of Underlying Collateral 11,730 0
Securities Sold under Agreements to Repurchase [Member] | JP Morgan Chase Bank [Member]    
Debt Instrument [Line Items]    
Borrowings 152,500 82,500
Fair Value of Underlying Collateral 164,749 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 $ 116,589 $ 116,509