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Cash and cash equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Line Items]        
Cash and due from banks $ 4,985us-gaap_CashAndDueFromBanks $ 2,161us-gaap_CashAndDueFromBanks    
Interest-bearing deposits in banks 775,530us-gaap_InterestBearingDepositsInBanks 837,557us-gaap_InterestBearingDepositsInBanks    
Total 780,515us-gaap_Cash 839,718us-gaap_Cash    
Less:        
Pledged deposits 39,210us-gaap_RestrictedCashAndCashEquivalents 9,032us-gaap_RestrictedCashAndCashEquivalents    
Cash and Cash Equivalents, At Carrying Value $ 741,305us-gaap_CashAndCashEquivalentsAtCarryingValue $ 830,686us-gaap_CashAndCashEquivalentsAtCarryingValue $ 692,511us-gaap_CashAndCashEquivalentsAtCarryingValue $ 789,490us-gaap_CashAndCashEquivalentsAtCarryingValue