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Cash and cash equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and Cash Equivalents [Line Items]        
Cash and due from banks $ 2,161 $ 6,718    
Interest-bearing deposits in banks 837,557 700,312    
Total 839,718 707,030    
Less:        
Pledged deposits 9,032 14,519    
Cash and Cash Equivalents, At Carrying Value $ 830,686 $ 692,511 $ 789,490 $ 420,639