Short-term borrowings (Details Textual)	Mar. 31, 2017 USD ($) Institution	Dec. 31, 2016 USD ($) Institution
Short Term Debt [Line Items]
Short-term Federal Home Loan Banks advances	$ 150,000,000	$ 120,000,000
Securities sold under repurchase agreements	84,900,000	78,100,000
Federal funds purchased	0	0
Business line of credit	$ 350,000	$ 350,000
Number of lending institutions \| Institution	1	1
Weighted Average
Short Term Debt [Line Items]
Weighted average interest rate	0.89%

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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