Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contingencies And Commitments [Line Items]
Mortgage loans in the process of origination	$ 7.7	$ 3.6
Mortgages loan held for sale	$ 4.0	$ 4.6
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