Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 67,717
Goodwill, Acquired During Period	44,940
Goodwill, Ending Balance	112,657
Banking [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	35,058
Goodwill, Acquired During Period	43,516
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	17,225
Goodwill, Acquired During Period	1,424
Goodwill, Ending Balance	$ 18,649