Summary of Significant Accounting Principles - Loans and Leases (Details) |
12 Months Ended |
|---|---|
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Dec. 31, 2017
portfolio_segment
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| Accounting Policies [Abstract] | |
| Number of portfolio segments | 3 |
| X | ||||||||||
- Definition Number of Portfolio Segments No definition available.
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| X | ||||||||||
- References No definition available.
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