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Fair value of financial instruments - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities:
Available-for-sale, Fair Value	$ 259,410
Held-to-maturity, Fair value	10,714	$ 12,606
Mortgage servicing rights	698	465
Carrying Value
Financial assets:
Cash and cash equivalents	39,941	32,917
Investment securities:
Available-for-sale, Fair Value	259,410	284,935
Held-to-maturity, Fair value	10,517	12,109
Net loans	1,517,004	1,327,890
Accrued interest receivable	6,228	5,796
Mortgage servicing rights	698	465
Restricted equity securities	7,051	5,403
Assets, Fair Value Disclosure	1,840,849	1,669,515
Financial liabilities:
Deposits	1,588,757	1,455,810
Short-term borrowings	82,700	38,325
Long-term debt	58,134	60,354
Accrued interest payable	462	560
Liabilities, total	1,730,053	1,555,049
Fair Value
Financial assets:
Cash and cash equivalents	39,941	32,917
Investment securities:
Available-for-sale, Fair Value	259,410	284,935
Held-to-maturity, Fair value	10,714	12,606
Net loans	1,507,936	1,330,900
Accrued interest receivable	6,228	5,796
Mortgage servicing rights	1,587	1,543
Restricted equity securities	7,051	5,403
Assets, Fair Value Disclosure	1,832,867	1,674,100
Financial liabilities:
Deposits	1,587,701	1,455,979
Short-term borrowings	82,700	38,325
Long-term debt	58,987	61,412
Accrued interest payable	462	560
Liabilities, total	1,729,850	1,556,276
Level 1
Financial assets:
Cash and cash equivalents	39,941	32,917
Investment securities:
Available-for-sale, Fair Value	7,438	9,999
Level 2
Investment securities:
Available-for-sale, Fair Value	251,972	274,936
Held-to-maturity, Fair value	10,714	12,606
Accrued interest receivable	6,228	5,796
Mortgage servicing rights	1,587	1,543
Restricted equity securities	7,051	5,403
Financial liabilities:
Deposits	1,587,701	1,455,979
Short-term borrowings	82,700	38,325
Long-term debt	58,987	61,412
Accrued interest payable	462	560
Level 3
Investment securities:
Net loans	$ 1,507,936	$ 1,330,900

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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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