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
	Mar. 31, 2020	Mar. 31, 2019
Allowance for Loan and Lease Losses:
Balance at Beginning of Period		$ 106,693
Loans and Leases Charged-Off	$ (7,177)	(6,828)
Recoveries on Loans and Leases Previously Charged-Off	3,437	3,158
Net Loans and Leases Recovered (Charged-Off)	(3,740)	(3,670)
Provision for Credit Losses	33,600	3,000
Balance at End of Period	138,150	106,023
Commercial
Allowance for Loan and Lease Losses:
Balance at Beginning of Period		66,874
Loans and Leases Charged-Off	(693)	(1,986)
Recoveries on Loans and Leases Previously Charged-Off	329	501
Net Loans and Leases Recovered (Charged-Off)	(364)	(1,485)
Provision for Credit Losses	13,339	2,138
Balance at End of Period	67,987	67,527
Consumer
Allowance for Loan and Lease Losses:
Balance at Beginning of Period		39,819
Loans and Leases Charged-Off	(6,484)	(4,842)
Recoveries on Loans and Leases Previously Charged-Off	3,108	2,657
Net Loans and Leases Recovered (Charged-Off)	(3,376)	(2,185)
Provision for Credit Losses	20,261	862
Balance at End of Period	70,163	$ 38,496
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