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Derivative financial instruments for hedging purposes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total	$ 11,461	$ (5,093)	$ (3,740)
Fair Value Hedging [Member]
Total	12,311	(17,042)	(4,517)
Derivative Assets (Liabilities), at Fair Value, Net	(24,380)	19,922	7,049
Net Gain Loss On Derivative and Hedge Item	(12,069)	2,880	2,532
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Interest Expense [Member]
Total	1,564
Derivative Assets (Liabilities), at Fair Value, Net	(12,022)
Net Gain Loss On Derivative and Hedge Item	(10,458)
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Interest Income Available For Sale [Member]
Total	(2,982)	(6,857)	(14,760)
Derivative Assets (Liabilities), at Fair Value, Net	4,776	10,266	22,000
Net Gain Loss On Derivative and Hedge Item	1,794	3,409	7,240
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Derivative Financial Instruments and Hedging [Member]
Total		74	419
Derivative Assets (Liabilities), at Fair Value, Net		0	0
Net Gain Loss On Derivative and Hedge Item		74	419
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Derivative Financial Instruments and Hedging (Ineffectiveness) [Member]
Total	59
Derivative Assets (Liabilities), at Fair Value, Net	0
Net Gain Loss On Derivative and Hedge Item	59
Fair Value Hedging [Member] \| Cross Currency Interest Rate Contract [Member] \| Interest Income [Member]
Total	(239)	(33)	(45)
Derivative Assets (Liabilities), at Fair Value, Net	522	55	89
Net Gain Loss On Derivative and Hedge Item	283	22	44
Fair Value Hedging [Member] \| Cross Currency Interest Rate Contract [Member] \| Interest Expense [Member]
Total	8,024	4,352	3,812
Derivative Assets (Liabilities), at Fair Value, Net	(11,187)	(7,874)	(7,046)
Net Gain Loss On Derivative and Hedge Item	(3,163)	(3,522)	(3,234)
Fair Value Hedging [Member] \| Cross Currency Interest Rate Contract [Member] \| Foreign Currency Gain (Loss) [Member]
Total	5,873	(17,427)	7,922
Derivative Assets (Liabilities), at Fair Value, Net	(6,469)	17,475	(7,994)
Net Gain Loss On Derivative and Hedge Item	(596)	48	(72)
Fair Value Hedging [Member] \| Cross Currency Interest Rate Contract [Member] \| Derivative Financial Instruments and Hedging (Ineffectiveness) [Member]
Total	12	2,849	(1,865)
Derivative Assets (Liabilities), at Fair Value, Net	0	0	0
Net Gain Loss On Derivative and Hedge Item	$ 12	$ 2,849	$ (1,865)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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