Allowance for Loan and Lease Loss and Credit Quality (Non-Accrual Loans And Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 43,592	$ 32,171
Nonaccrual	29,215	52,041
Current	16,774,553	15,243,520
Total, Non-covered loans and leases	16,847,360	15,327,732
Loans acquired with deteriorated credit quality	705,896	508,745
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	438,100	562,900
Loans acquired with deteriorated credit quality	438,104	562,851
Greater Than 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,638	18,284
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,785	6,375
Greater than 90 Days and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,169	7,512
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total, Non-covered loans and leases	9,309,035	8,903,660
Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans acquired with deteriorated credit quality	339,703	459,308
Commercial Real Estate [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,225	735
Nonaccrual	2,633	8,957
Current	3,133,987	3,280,918
Total, Non-covered loans and leases	3,140,845	3,290,610
Commercial Real Estate [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,967	2,651
Nonaccrual	5,928	8,292
Current	2,682,026	2,622,921
Total, Non-covered loans and leases	2,691,921	2,633,864
Commercial Real Estate [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	408	512
Nonaccrual	0	300
Current	3,074,510	2,637,806
Total, Non-covered loans and leases	3,074,918	2,638,618
Commercial Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,959	1,091
Nonaccrual	0	0
Current	298,933	257,631
Total, Non-covered loans and leases	301,892	258,722
Commercial Real Estate [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	6,155
Nonaccrual	0	0
Current	99,459	75,691
Total, Non-covered loans and leases	99,459	81,846
Commercial Real Estate [Member] | Greater Than 30 to 59 Days Past Due [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,312	452
Commercial Real Estate [Member] | Greater Than 30 to 59 Days Past Due [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,394	2,304
Commercial Real Estate [Member] | Greater Than 30 to 59 Days Past Due [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	408	0
Commercial Real Estate [Member] | Greater Than 30 to 59 Days Past Due [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,091
Commercial Real Estate [Member] | Greater Than 30 to 59 Days Past Due [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	6,155
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,776	0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,150	347
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	512
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,959	0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate [Member] | Greater than 90 Days and Accruing [Member] | Non-owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	137	283
Commercial Real Estate [Member] | Greater than 90 Days and Accruing [Member] | Owner Occupied Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	423	0
Commercial Real Estate [Member] | Greater than 90 Days and Accruing [Member] | Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate [Member] | Greater than 90 Days and Accruing [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate [Member] | Greater than 90 Days and Accruing [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total, Non-covered loans and leases	3,197,246	2,948,823
Commercial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans acquired with deteriorated credit quality	31,570	31,499
Commercial [Member] | Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	631	1,343
Nonaccrual	15,185	19,097
Current	1,409,193	1,375,649
Total, Non-covered loans and leases	1,425,009	1,396,089
Commercial [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,007	4,015
Nonaccrual	664	8,825
Current	1,040,405	1,016,780
Total, Non-covered loans and leases	1,043,076	1,029,620
Commercial [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,254	3,872
Nonaccrual	4,801	5,084
Current	717,106	514,158
Total, Non-covered loans and leases	729,161	523,114
Commercial [Member] | Greater Than 30 to 59 Days Past Due [Member] | Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	298	1,098
Commercial [Member] | Greater Than 30 to 59 Days Past Due [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,907	1,637
Commercial [Member] | Greater Than 30 to 59 Days Past Due [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,933	1,482
Commercial [Member] | 60 to 89 Days Past Due [Member] | Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	333	242
Commercial [Member] | 60 to 89 Days Past Due [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	92	1,155
Commercial [Member] | 60 to 89 Days Past Due [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,499	1,695
Commercial [Member] | Greater than 90 Days and Accruing [Member] | Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	3
Commercial [Member] | Greater than 90 Days and Accruing [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8	1,223
Commercial [Member] | Greater than 90 Days and Accruing [Member] | Leases and Equipment Finance [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	822	695
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total, Non-covered loans and leases	3,813,890	3,086,213
Residential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans acquired with deteriorated credit quality	63,867	1,580
Residential [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,532	5,521
Nonaccrual	0	655
Current	2,877,691	2,227,559
Total, Non-covered loans and leases	2,890,223	2,233,735
Residential [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,807	3,375
Nonaccrual	0	615
Current	918,860	848,488
Total, Non-covered loans and leases	923,667	852,478
Residential [Member] | Greater Than 30 to 59 Days Past Due [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31	8
Residential [Member] | Greater Than 30 to 59 Days Past Due [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,084	1,924
Residential [Member] | 60 to 89 Days Past Due [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,444	1,224
Residential [Member] | 60 to 89 Days Past Due [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	643	702
Residential [Member] | Greater than 90 Days and Accruing [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,057	4,289
Residential [Member] | Greater than 90 Days and Accruing [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,080	749
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,802	2,901
Nonaccrual	4	216
Current	522,383	385,919
Total, Non-covered loans and leases	527,189	389,036
Consumer & Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans acquired with deteriorated credit quality	2,964	70,464
Consumer & Other [Member] | Greater Than 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,271	2,133
Consumer & Other [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	889	498
Consumer & Other [Member] | Greater than 90 Days and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 642	$ 270