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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Credit Risk Valuation Adjustment, Derivative Assets $ 0   $ 0
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities $ 0   $ 0
Fair Value Inputs, Prepayment Rate 1.00%   1.00%
Annual prepayments maturity 100.00%   100.00%
Additional basis points 1.50%   1.50%
Maximum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateral discount 30.00% 30.00%  
Minimum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Collateral discount 20.00% 20.00%