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Securities sold under repurchase agreements (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Securities Financing Transaction [Line Items]      
Securities sold under repurchase agreement $ 286,162,000 $ 158,374,000  
Interest Expense, Debt $ 1,300,000 $ 1,700,000 $ 2,100,000