Summary of Significant Accounting Principles - Allowance for Credit Losses (Details) |
12 Months Ended |
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Dec. 31, 2017 | |
| Home equity lines of credit | Second Mortgage | |
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |
| Loss severity | 100.00% |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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