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Securities sold under repurchase agreements (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreement	$ 300,519,000	$ 286,162,000
Interest Expense, Debt	$ 2,100,000us-gaap_InterestExpenseDebt	$ 1,300,000us-gaap_InterestExpenseDebt	$ 1,700,000us-gaap_InterestExpenseDebt

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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