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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment securities:
Available-for-sale, Fair Value	$ 251,382	$ 284,935
Held-to-maturity, Fair Value	12,065	12,606
Mortgage servicing rights	489	465
Level 1
Financial assets:
Cash and cash equivalents	30,077	32,917
Investment securities:
Available-for-sale, Fair Value		9,999
Level 2
Investment securities:
Available-for-sale, Fair Value	251,382	274,936
Held-to-maturity, Fair Value	12,065	12,606
Accrued interest receivable	5,952	5,796
Mortgage servicing rights	1,543	1,543
Restricted equity securities	6,878	5,403
Financial liabilities:
Deposits	1,499,201	1,455,979
Short-term borrowings	86,282	38,325
Long-term debt	61,334	61,412
Accrued interest payable	453	560
Level 3
Investment securities:
Net loans	1,465,095	1,330,900
Carrying Value
Financial assets:
Cash and cash equivalents	30,077	32,917
Investment securities:
Available-for-sale, Fair Value	251,382	284,935
Held-to-maturity, Fair Value	11,262	12,109
Net loans	1,450,009	1,327,890
Accrued interest receivable	5,952	5,796
Mortgage servicing rights	489	465
Restricted equity securities	6,878	5,403
Assets, Fair Value Disclosure	1,756,049	1,669,515
Financial liabilities:
Deposits	1,496,863	1,455,810
Short-term borrowings	86,300	38,325
Long-term debt	59,232	60,354
Accrued interest payable	453	560
Liabilities, total	1,642,848	1,555,049
Fair Value
Financial assets:
Cash and cash equivalents	30,077	32,917
Investment securities:
Available-for-sale, Fair Value	251,382	284,935
Held-to-maturity, Fair Value	12,065	12,606
Net loans	1,465,095	1,330,900
Accrued interest receivable	5,952	5,796
Mortgage servicing rights	1,543	1,543
Restricted equity securities	6,878	5,403
Assets, Fair Value Disclosure	1,772,992	1,674,100
Financial liabilities:
Deposits	1,499,201	1,455,979
Short-term borrowings	86,282	38,325
Long-term debt	61,334	61,412
Accrued interest payable	453	560
Liabilities, total	$ 1,647,270	$ 1,556,276

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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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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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