Contingencies and Guarantees (Narratives) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Asset sales [Line Items]
Guarantor Obligations, Short-Term	$ 118,200
Financing Receivable, Repurchase Reserve	2,625	$ 2,725	$ 6,650	$ 7,250
Allowance for Loan and Lease Losses, Unfunded Lending Commitments	4,900	4,100	4,300
Residential Mortgages
Asset sales [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	9,200	10,100	33,100
Financing Receivable, Repurchase Reserve	$ 2,600	$ 2,700	$ 6,700