Contingencies, Commitments And Guarantees (Standby Letters Of Credit Instruments) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Contingencies, Commitments And Guarantees [Line Items]
Outstanding letters of credit	$ 41,990
0-12 Months [Member]
Contingencies, Commitments And Guarantees [Line Items]
Outstanding letters of credit	27,236
Greater Than 12 Months [Member]
Contingencies, Commitments And Guarantees [Line Items]
Outstanding letters of credit	$ 14,754