Contingencies and Guarantees (Narratives) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Asset sales [Line Items]
Guarantor Obligations, Short-Term	$ 106,800
Financing Receivable, Repurchase Reserve	2,625	$ 2,625	$ 2,725	$ 6,650	$ 6,650	$ 7,250
Allowance for Loan and Lease Losses, Unfunded Lending Commitments	4,100		4,100	3,900
Residential Mortgages
Asset sales [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	9,100		10,100	22,200
Financing Receivable, Repurchase Reserve	$ 2,600		$ 2,700	$ 6,700