Loans and Leases and the Allowance for Loan and Lease Losses (Allowance for Loan and Lease Losses) (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	$ 138,150	$ 106,023		$ 106,693
Loans and Leases Charged-Off	(8,283)	(5,129)	$ (15,460)	(11,957)
Recoveries on Loans and Leases Previously Charged-Off	3,172	2,778	6,609	5,936
Net Loans and Leases Recovered (Charged-Off)	(5,111)	(2,351)	(8,851)	(6,021)
Provision for Credit Losses	40,400	4,000	74,000	7,000
Balance at End of Period	173,439	107,672	173,439	107,672
Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	67,987	67,527		66,874
Loans and Leases Charged-Off	(656)	(206)	(1,349)	(2,192)
Recoveries on Loans and Leases Previously Charged-Off	1,524	401	1,853	902
Net Loans and Leases Recovered (Charged-Off)	868	195	504	(1,290)
Provision for Credit Losses	3,667	1,546	17,006	3,684
Balance at End of Period	72,522	69,268	72,522	69,268
Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period	70,163	38,496		39,819
Loans and Leases Charged-Off	(7,627)	(4,923)	(14,111)	(9,765)
Recoveries on Loans and Leases Previously Charged-Off	1,648	2,377	4,756	5,034
Net Loans and Leases Recovered (Charged-Off)	(5,979)	(2,546)	(9,355)	(4,731)
Provision for Credit Losses	36,733	2,454	56,994	3,316
Balance at End of Period	$ 100,917	$ 38,404	100,917	$ 38,404
Accounting Standards Update 2016-13
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			110,027
Accounting Standards Update 2016-13 | Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			73,801
Accounting Standards Update 2016-13 | Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			36,226
CECL Adoption Impact | Accounting Standards Update 2016-13
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			(1,737)
CECL Adoption Impact | Accounting Standards Update 2016-13 | Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			(18,789)
CECL Adoption Impact | Accounting Standards Update 2016-13 | Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			17,052
January 1, 2020 | Accounting Standards Update 2016-13
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			108,290
January 1, 2020 | Accounting Standards Update 2016-13 | Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			55,012
January 1, 2020 | Accounting Standards Update 2016-13 | Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period			$ 53,278