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Summary of Significant Accounting Policies (Mortgage Banking Operations) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Change in accounting policy for ASC Subtopic 860-50
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cumulative adjustment to retained earnings	$ 5.7
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forward commitment term	90 days

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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