Contingencies, Commitments And Guarantees (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Contingencies, Commitments And Guarantees [Line Items]
Aggregate notional value standby letters of credit	$ 41,990
Commercial Contract [Member]
Contingencies, Commitments And Guarantees [Line Items]
Approximate commitments	$ 106,900
Minimum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Letter Of Credit Maturity Term	1 month
Maximum [Member]
Contingencies, Commitments And Guarantees [Line Items]
Letter Of Credit Maturity Term	5 years
Settled Litigation [Member] | Wage and Hour Action California [Member]
Contingencies, Commitments And Guarantees [Line Items]
Estimated Litigation Liability	$ 2,400
Standby Letters of Credit [Member]
Contingencies, Commitments And Guarantees [Line Items]
Aggregate notional value standby letters of credit	$ 34,300