Fair Value Measurement (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Other Company Stock Owned Fair Value Discount Percentage	5.00%
Net gain (loss) representing the change in fair value in earnings	$ 4.9	$ 4.9
Days past due of on account nonaccrual residential mortgage loans held for sale or residential mortgage loans held for sale	90 days