Allowance for Loan and Lease Loss and Credit Quality (Non-Accrual Loans And Loans Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 64,011	$ 62,768
Non-Accrual	25,136	29,215
Current & Other	17,266,093	16,774,553
Loans by credit quality	17,355,240	16,866,536
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current & Other	330,900	438,100
Greater than 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,952	13,638
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,688	14,785
Equal to Greater than 90 Days and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34,371	34,345
Commercial Real Estate | Non-owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,765	3,837
Non-Accrual	1,492	2,633
Current & Other	3,373,207	3,220,366
Loans by credit quality	3,377,464	3,226,836
Commercial Real Estate | Owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,573	3,370
Non-Accrual	5,190	5,928
Current & Other	2,572,023	2,573,576
Loans by credit quality	2,581,786	2,582,874
Commercial Real Estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	1,394
Non-Accrual	514	0
Current & Other	3,003,860	3,150,122
Loans by credit quality	3,004,890	3,151,516
Commercial Real Estate | Construction & Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	2,959
Non-Accrual	0	0
Current & Other	367,879	268,160
Loans by credit quality	367,879	271,119
Commercial Real Estate | Residential Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual	0	0
Current & Other	111,941	99,459
Loans by credit quality	111,941	99,459
Commercial Real Estate | Greater than 30 to 59 Days Past Due | Non-owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,438	924
Commercial Real Estate | Greater than 30 to 59 Days Past Due | Owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,903	1,797
Commercial Real Estate | Greater than 30 to 59 Days Past Due | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	1,394
Commercial Real Estate | Greater than 30 to 59 Days Past Due | Construction & Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | Greater than 30 to 59 Days Past Due | Residential Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | 60 to 89 Days Past Due | Non-owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	304	2,776
Commercial Real Estate | 60 to 89 Days Past Due | Owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,165	1,150
Commercial Real Estate | 60 to 89 Days Past Due | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | 60 to 89 Days Past Due | Construction & Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	2,959
Commercial Real Estate | 60 to 89 Days Past Due | Residential Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | Equal to Greater than 90 Days and Accruing | Non-owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,023	137
Commercial Real Estate | Equal to Greater than 90 Days and Accruing | Owner Occupied Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	505	423
Commercial Real Estate | Equal to Greater than 90 Days and Accruing | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | Equal to Greater than 90 Days and Accruing | Construction & Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate | Equal to Greater than 90 Days and Accruing | Residential Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	580	630
Non-Accrual	10,748	15,185
Current & Other	1,429,376	1,392,861
Loans by credit quality	1,440,704	1,408,676
Commercial | LOC & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,863	2,007
Non-Accrual	817	664
Current & Other	1,114,196	1,034,062
Loans by credit quality	1,116,876	1,036,733
Commercial | Leases and Equipment Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,258	7,254
Non-Accrual	6,375	4,801
Current & Other	868,873	717,106
Loans by credit quality	884,506	729,161
Commercial | Greater than 30 to 59 Days Past Due | Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	297
Commercial | Greater than 30 to 59 Days Past Due | LOC & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	918	1,907
Commercial | Greater than 30 to 59 Days Past Due | Leases and Equipment Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,402	2,933
Commercial | 60 to 89 Days Past Due | Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	252	333
Commercial | 60 to 89 Days Past Due | LOC & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	945	92
Commercial | 60 to 89 Days Past Due | Leases and Equipment Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,923	3,499
Commercial | Equal to Greater than 90 Days and Accruing | Term
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	317	0
Commercial | Equal to Greater than 90 Days and Accruing | LOC & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	8
Commercial | Equal to Greater than 90 Days and Accruing | Leases and Equipment Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	933	822
Residential | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35,105	31,708
Non-Accrual	0	0
Current & Other	2,846,971	2,877,598
Loans by credit quality	2,882,076	2,909,306
Residential | Home Equity Loans & Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,883	4,807
Non-Accrual	0	0
Current & Other	984,931	918,860
Loans by credit quality	989,814	923,667
Residential | Greater than 30 to 59 Days Past Due | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	31
Residential | Greater than 30 to 59 Days Past Due | Home Equity Loans & Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,682	1,084
Residential | 60 to 89 Days Past Due | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,093	2,444
Residential | 60 to 89 Days Past Due | Home Equity Loans & Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	891	643
Residential | Equal to Greater than 90 Days and Accruing | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30,012	29,233
Residential | Equal to Greater than 90 Days and Accruing | Mortgage | GNMA Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,300	19,200
Residential | Equal to Greater than 90 Days and Accruing | Home Equity Loans & Lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,310	3,080
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,468	4,802
Non-Accrual	0	4
Current & Other	592,836	522,383
Loans by credit quality	597,304	527,189
Consumer & Other | Greater than 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,082	3,271
Consumer & Other | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,115	889
Consumer & Other | Equal to Greater than 90 Days and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 271	$ 642