Fair Value Measurements (Aggregate Fair Value, Contractual Balance, and Gain or Loss for Loans Held-For-Sale) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Aggregate fair value	$ 276,061	$ 10,327
Contractual balance	274,406	10,366
Unrealized gain (loss)	$ 1,655	$ (39)