Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 112,657
Goodwill, Acquired During Period	0
Goodwill, Ending Balance	112,657
Banking [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	78,574
Goodwill, Acquired During Period	0
Goodwill, Ending Balance	78,574
Wealth Management [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	15,434
Goodwill, Acquired During Period	0
Goodwill, Ending Balance	15,434
Insurance [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	18,649
Goodwill, Acquired During Period	0
Goodwill, Ending Balance	$ 18,649