Allowance for Loan and Lease Loss and Credit Quality (Non-Accrual Loans And Loans Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 74,683	$ 69,651
Non-Accrual	26,566	27,765
Current & Other	18,219,893	17,411,247
Loans by credit quality	18,321,142	17,508,663
GNMA Loans past due by 90 days, but not yet repurchased	16,300
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current & Other	235,700	280,400
Greater than 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16,112	12,587
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,041	17,838
Greater than 90 Days and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	43,530	39,226
Commercial real estate | Non-owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,006	2,792
Non-Accrual	3,632	2,100
Current & Other	3,396,041	3,325,550
Loans by credit quality	3,401,679	3,330,442
Commercial real estate | Owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,076	5,514
Non-Accrual	6,313	4,391
Current & Other	2,583,006	2,589,150
Loans by credit quality	2,593,395	2,599,055
Commercial real estate | Multifamily, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	522	0
Non-Accrual	376	476
Current & Other	2,963,953	2,858,480
Loans by credit quality	2,964,851	2,858,956
Commercial real estate | Construction & development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual	0	0
Current & Other	464,690	463,625
Loans by credit quality	464,690	463,625
Commercial real estate | Residential development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Non-Accrual	0	0
Current & Other	165,956	142,984
Loans by credit quality	165,956	142,984
Commercial real estate | Greater than 30 to 59 Days Past Due | Non-owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,015	718
Commercial real estate | Greater than 30 to 59 Days Past Due | Owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,150	974
Commercial real estate | Greater than 30 to 59 Days Past Due | Multifamily, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	522	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Construction & development, net
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, net
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, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	959	1,027
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	926	4,539
Commercial real estate | 60 to 89 Days Past Due | Multifamily, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial real estate | 60 to 89 Days Past Due | Construction & development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial real estate | 60 to 89 Days Past Due | Residential development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial real estate | Greater than 90 Days and Accruing | Non-owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	32	1,047
Commercial real estate | Greater than 90 Days and Accruing | Owner occupied term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1
Commercial real estate | Greater than 90 Days and Accruing | Multifamily, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial real estate | Greater than 90 Days and Accruing | Construction & development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial real estate | Greater than 90 Days and Accruing | Residential development, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	197	552
Non-Accrual	4,726	6,880
Current & Other	1,681,674	1,501,348
Loans by credit quality	1,686,597	1,508,780
Commercial | LOC & other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,983	1,700
Non-Accrual	2,038	4,998
Current & Other	1,149,388	1,109,561
Loans by credit quality	1,153,409	1,116,259
Commercial | Leases and equipment finance, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,057	14,016
Non-Accrual	9,481	8,920
Current & Other	1,059,113	927,652
Loans by credit quality	1,082,651	950,588
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	195	319
Commercial | Greater than 30 to 59 Days Past Due | LOC & other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	476	1,673
Commercial | Greater than 30 to 59 Days Past Due | Leases and equipment finance, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,700	5,343
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	233
Commercial | 60 to 89 Days Past Due | LOC & other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,507	27
Commercial | 60 to 89 Days Past Due | Leases and equipment finance, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,849	6,865
Commercial | Greater than 90 Days and Accruing | Term, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Greater than 90 Days and Accruing | LOC & other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Greater than 90 Days and Accruing | Leases and equipment finance, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,508	1,808
Residential | Mortgage, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	43,128	36,827
Non-Accrual	0	0
Current & Other	2,978,203	2,851,144
Loans by credit quality	3,021,331	2,887,971
Residential | Home equity loans & lines, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,476	3,217
Non-Accrual	0	0
Current & Other	1,052,372	1,008,627
Loans by credit quality	1,056,848	1,011,844
Residential | Greater than 30 to 59 Days Past Due | Mortgage, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12	10
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,246	289
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,727	3,114
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	246	848
Residential | Greater than 90 Days and Accruing | Mortgage, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	38,389	33,703
Residential | Greater than 90 Days and Accruing | Mortgage, net | GNMA Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
GNMA Loans past due by 90 days, but not yet repurchased	16,300	10,900
Residential | Greater than 90 Days and Accruing | Home equity loans & lines, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,984	2,080
Consumer & other, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,238	5,033
Non-Accrual	0	0
Current & Other	725,497	633,126
Loans by credit quality	729,735	638,159
Consumer & other, net | Greater than 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,796	3,261
Consumer & other, net | 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	825	1,185
Consumer & other, net | Greater than 90 Days and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 617	$ 587