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Fair value of financial instruments - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment securities:
Available-for-sale	$ 284,935	$ 339,586
Held-to-maturity	12,606	15,215
Mortgage servicing rights	465	676
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	32,917	31,426
Investment securities:
Available-for-sale	9,999	48,550
Significant Other Observable Inputs (Level 2) [Member]
Investment securities:
Available-for-sale	274,936	291,036
Held-to-maturity	12,606	15,215
Loans held for sale		3,492
Accrued interest receivable	5,796	5,580
Mortgage servicing rights	1,543	1,466
Restricted equity securities	5,403	3,687
Financial liabilities:
Deposits	1,455,979	1,427,081
Short-term borrowings	38,325	19,557
Long-term debt	61,412	34,772
Accrued interest payable	560	574
Significant Unobservable Inputs (Level 3) [Member]
Investment securities:
Net loans	1,330,900	1,210,369
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	32,917	31,426
Investment securities:
Available-for-sale	284,935	339,586
Held-to-maturity	12,109	14,665
Loans held for sale		3,486
Net loans	1,327,890	1,199,556
Accrued interest receivable	5,796	5,580
Mortgage servicing rights	465	676
Restricted equity securities	5,403	3,687
Assets, Fair Value Disclosure	1,669,515	1,598,662
Financial liabilities:
Deposits	1,455,810	1,425,558
Short-term borrowings	38,325	19,557
Long-term debt	60,354	33,140
Accrued interest payable	560	574
Liabilities, total	1,555,049	1,478,829
Fair Value [Member]
Financial assets:
Cash and cash equivalents	32,917	31,426
Investment securities:
Available-for-sale	284,935	339,586
Held-to-maturity	12,606	15,215
Loans held for sale		3,492
Net loans	1,330,900	1,210,369
Accrued interest receivable	5,796	5,580
Mortgage servicing rights	1,543	1,466
Restricted equity securities	5,403	3,687
Assets, Fair Value Disclosure	1,674,100	1,610,821
Financial liabilities:
Deposits	1,455,979	1,427,081
Short-term borrowings	38,325	19,557
Long-term debt	61,412	34,772
Accrued interest payable	560	574
Liabilities, total	$ 1,556,276	$ 1,481,984

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents accrued interest payable as of the balance sheet date.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value of financial and nonfinancial obligations.

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The aggregate value of all restricted investments.

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