Loans (Activity Related to Accretable Yield of Loans Acquired with Evidence of Credit Quality Deterioration Since Origination) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	$ 63,902	$ 79,102
Acquisitions	2,462	9,993
Accretable yield amortized to interest income	(23,218)	(24,115)
Accretable yield amortized to indemnification asset/liability	(5,746)	(13,495)
Reclassifications from nonaccretable difference	13,733	7,390
(Decreases) increases in interest cash flows due to payments and changes in interest rates	(1,725)	5,027
Accretable yield, ending balance	49,408	$ 63,902
Bank acquisitions
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Remaining accretable yield balance to be amortized	$ 1,100