Borrowings under Repurchase Agreements Schedule of Repurchase Agreement by Counterparty (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017		Dec. 31, 2016
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty Concentration Risk Threshold	10.00%
Net Accrued Interest	$ 900		$ 600
J.P. Morgan Securities Inc. [Member]
Repurchase Agreement Counterparty [Line Items]
Repurchase Agreement Counterparty, Amount at Risk	$ 19,365	[1]	$ 15,077	[2]
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	38 days		58 days
Repurchase Agreement Counterparty, Percentage of Shareholders' Equity	10.60%		10.60%

[1] Amounts at risk exclude, in aggregate, $0.9 million of net accrued interest, defined as accrued interest on securities held as collateral less interest payable on cash borrowed.

[2] Amounts at risk exclude, in aggregate, $0.6 million of net accrued interest, defined as accrued interest on securities held as collateral less interest payable on cash borrowed.