Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Allowance for Credit Losses (Details)

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Summary of Significant Accounting Principles - Allowance for Credit Losses (Details)
12 Months Ended
Dec. 31, 2017
Home equity lines of credit | Second Mortgage  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Loss severity 100.00%