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Cash and cash equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash and due from banks $ 6,718 $ 12,814    
Interest-bearing deposits in banks 700,312 830,670    
Total 707,030 843,484    
Less:        
Interest-bearing deposits with original maturities of more than three months 0 30,000    
Pledged deposits 14,519 23,994    
Cash and cash equivalents, Total $ 692,511 $ 789,490 $ 420,639 $ 401,974