Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 34,376	$ 24,564
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2015	4,360
2016	4,214
2017	3,756
2018	3,078
2019	2,816
Thereafter	16,152
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	359,987	362,207
Goodwill, Accumulated Impairment Beginning Balance	(228)	(228)
Goodwill, Net Beginning Balance	359,759	361,979
Goodwill adjustmens during 2013		(2,220)
Goodwill acquired during 2014	18,021
Goodwill, Gross Ending Balance	378,008	359,987
Goodwill, Accumulated Impairment Ending Balance	(228)	(228)
Goodwill, Net Ending Balance	377,780	359,759
Commercial [Member]
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	268,942	271,162
Goodwill, Accumulated Impairment Beginning Balance	0	0
Goodwill, Net Beginning Balance	268,942	271,162
Goodwill adjustmens during 2013		(2,220)
Goodwill acquired during 2014	421
Goodwill, Gross Ending Balance	269,363	268,942
Goodwill, Accumulated Impairment Ending Balance	0	0
Goodwill, Net Ending Balance	269,363	268,942
Consumer [Member]
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	39,251	39,251
Goodwill, Accumulated Impairment Beginning Balance	(228)	(228)
Goodwill, Net Beginning Balance	39,023	39,023
Goodwill adjustmens during 2013		0
Goodwill acquired during 2014	0
Goodwill, Gross Ending Balance	39,251	39,251
Goodwill, Accumulated Impairment Ending Balance	(228)	(228)
Goodwill, Net Ending Balance	39,023	39,023
Wealth Management [Member]
Goodwill [Roll Forward]
Goodwill, Gross Beginning Balance	51,794	51,794
Goodwill, Accumulated Impairment Beginning Balance	0	0
Goodwill, Net Beginning Balance	51,794	51,794
Goodwill adjustmens during 2013		0
Goodwill acquired during 2014	17,600
Goodwill, Gross Ending Balance	69,394	51,794
Goodwill, Accumulated Impairment Ending Balance	0	0
Goodwill, Net Ending Balance	69,394	51,794
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	33,749	33,749
Accumulated amortization	33,088	32,656
Finite-lived intangible assets, net	661	1,093
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2015	393
2016	247
2017	21
2018	0
2019	0
Thereafter	0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	50,288	36,511
Accumulated amortization	16,573	13,040
Finite-lived intangible assets, net	33,715	23,471
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2015	3,967
2016	3,967
2017	3,735
2018	3,078
2019	2,816
Thereafter	$ 16,152