Loans and Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) numberOfLoans	Dec. 31, 2019 USD ($)
Receivables [Abstract]
Loans and leases, deferred fees and costs	$ 38,600	$ 71,900
Number of PPP Loans | numberOfLoans	14,800
Total PPP Loan Amount	$ 1,800,000
PPP Loan Fees, Net of Costs	26,900
Discounts on acquired loans	17,900	30,200
Total loans pledged to secure borrowings	12,100,000
Direct Financing Lease, Interest Income	26,500	32,800
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 83,804	70,210
Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Lease term	3 years
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Lease term	5 years
Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	$ 74,800	$ 58,500