Contingencies and Guarantees (Schedule of Guarantor Obligations) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 232,456	$ 267,605	$ 284,309
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	220,913	254,703	255,418
Loans Sold with Recourse
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 11,543	$ 12,902	$ 28,891