Allowance for Loan and Lease Loss and Credit Quality (Internal Risk Rating By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 16,847,360	$ 15,327,732
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 16,345,001	$ 14,729,544
Percentage of impaired loans	5.00%	5.60%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 205,959	$ 213,806
Percentage of impaired loans	4.60%	15.10%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 219,774	$ 261,399
Percentage of impaired loans	90.40%	77.90%
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 5,871	$ 4,863
Percentage of impaired loans		0.10%
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	18,642	$ 15,548
Percentage of impaired loans		1.30%
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	52,113	$ 102,572
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	9,309,035	8,903,660
Commercial Real Estate [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,140,845	3,290,610
Commercial Real Estate [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,691,921	2,633,864
Commercial Real Estate [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,074,918	2,638,618
Commercial Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	301,892	258,722
Commercial Real Estate [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	99,459	81,846
Commercial Real Estate [Member] | Pass/Watch [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,963,339	3,027,777
Commercial Real Estate [Member] | Pass/Watch [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,553,909	2,475,944
Commercial Real Estate [Member] | Pass/Watch [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,047,889	2,610,039
Commercial Real Estate [Member] | Pass/Watch [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	288,018	248,547
Commercial Real Estate [Member] | Pass/Watch [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	89,706	68,789
Commercial Real Estate [Member] | Special Mention [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	82,538	99,556
Commercial Real Estate [Member] | Special Mention [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	60,042	58,425
Commercial Real Estate [Member] | Special Mention [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	5,641	9,583
Commercial Real Estate [Member] | Special Mention [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	10,659	4,081
Commercial Real Estate [Member] | Special Mention [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	507	963
Commercial Real Estate [Member] | Substandard [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	86,213	123,350
Commercial Real Estate [Member] | Substandard [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	68,522	81,567
Commercial Real Estate [Member] | Substandard [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	17,869	15,177
Commercial Real Estate [Member] | Substandard [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,124	5,003
Commercial Real Estate [Member] | Substandard [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,355	2,419
Commercial Real Estate [Member] | Doubtful [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	270	821
Commercial Real Estate [Member] | Doubtful [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	675	309
Commercial Real Estate [Member] | Doubtful [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Doubtful [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Doubtful [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Loss [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	279	0
Commercial Real Estate [Member] | Loss [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,361	1,674
Commercial Real Estate [Member] | Loss [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Loss [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Loss [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Commercial Real Estate [Member] | Impaired [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	8,206	39,106
Commercial Real Estate [Member] | Impaired [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	7,412	15,945
Commercial Real Estate [Member] | Impaired [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,519	3,819
Commercial Real Estate [Member] | Impaired [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,091	1,091
Commercial Real Estate [Member] | Impaired [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	7,891	9,675
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,197,246	2,948,823
Commercial [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,425,009	1,396,089
Commercial [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,043,076	1,029,620
Commercial [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	729,161	523,114
Commercial [Member] | Pass/Watch [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,369,230	1,346,148
Commercial [Member] | Pass/Watch [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1,004,946	991,209
Commercial [Member] | Pass/Watch [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	716,190	513,104
Commercial [Member] | Special Mention [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	13,620	12,661
Commercial [Member] | Special Mention [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	19,183	17,665
Commercial [Member] | Special Mention [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,849	2,554
Commercial [Member] | Substandard [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	20,953	17,901
Commercial [Member] | Substandard [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	15,959	6,399
Commercial [Member] | Substandard [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,499	3,809
Commercial [Member] | Doubtful [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	36	198
Commercial [Member] | Doubtful [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1	280
Commercial [Member] | Doubtful [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,889	3,255
Commercial [Member] | Loss [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	162	224
Commercial [Member] | Loss [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	1	88
Commercial [Member] | Loss [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	734	392
Commercial [Member] | Impaired [Member] | Term [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	21,008	18,957
Commercial [Member] | Impaired [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,986	13,979
Commercial [Member] | Impaired [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,813,890	3,086,213
Residential [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,890,223	2,233,735
Residential [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	923,667	852,478
Residential [Member] | Pass/Watch [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,871,516	2,215,956
Residential [Member] | Pass/Watch [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	917,919	846,277
Residential [Member] | Special Mention [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	3,557	2,330
Residential [Member] | Special Mention [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,189	3,271
Residential [Member] | Substandard [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,019	4,497
Residential [Member] | Substandard [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	803	1,079
Residential [Member] | Doubtful [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Residential [Member] | Doubtful [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Residential [Member] | Loss [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	13,131	10,952
Residential [Member] | Loss [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	2,756	1,851
Residential [Member] | Impaired [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Residential [Member] | Impaired [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Consumer & Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	527,189	389,036
Consumer & Other [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	522,339	385,754
Consumer & Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	4,174	2,717
Consumer & Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	458	198
Consumer & Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	0	0
Consumer & Other [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	218	367
Consumer & Other [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans by credit quality	$ 0	$ 0