Summary of Significant Accounting Policies (Paycheck Protection Program) (Details) - C&I - CARES Act, Paycheck Protection Program Liquidity Facility $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) loan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate	1.00%
Number of PPP loans authorized | loan	6,200
Amount of PPP loans authorized, outstanding balance | $	$ 1,570
Financing Receivable, Term	2 years