Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination	$ 11.4	$ 7.7
Mortgages loan held for sale	$ 13.4	$ 4.0
Minimum
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination, funding period	60 days
Maximum
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination, funding period	90 days