Portfolio Assets (Details 2) (USD $) In Thousands, unless otherwise specified			3 Months Ended					3 Months Ended					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Loan Portfolios	Mar. 31, 2012 Loan Portfolios	Mar. 31, 2013 Loan Portfolios Other commercial Other	Mar. 31, 2012 Loan Portfolios Other commercial Other	Dec. 31, 2011 Loan Portfolios Other commercial Other	Mar. 31, 2013 Loan Portfolios Domestic Commercial real estate Purchased Credit-Impaired Loans	Mar. 31, 2012 Loan Portfolios Domestic Commercial real estate Purchased Credit-Impaired Loans	Mar. 31, 2012 Loan Portfolios Domestic Business assets Purchased Credit-Impaired Loans	Mar. 31, 2013 Loan Portfolios Domestic Business assets Purchased Credit-Impaired Loans	Dec. 31, 2012 Loan Portfolios Domestic Business assets Purchased Credit-Impaired Loans	Mar. 31, 2012 Loan Portfolios Domestic Other commercial Purchased Credit-Impaired Loans	Mar. 31, 2013 Loan Portfolios Latin America Commercial real estate Purchased Credit-Impaired Loans
Changes in the allowance for loan losses related to portfolio assets
Beginning balance	$ 417	$ 394	$ 394	$ 781	$ 41	$ 5	$ 5		$ 553	$ 185	$ 26	$ 26	$ 38	$ 327
Provisions			61	195				61	128	62			5
Recoveries			(10)	(44)	(10)					(44)
Charge offs			(32)	(179)				(32)	(171)	(3)			(5)
Translation adjustments			4											4
Ending balance	$ 417	$ 394	$ 417	$ 753	$ 31	$ 5	$ 5	$ 29	$ 510	$ 200	$ 26	$ 26	$ 38	$ 331