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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment securities:
Available-for-sale	$ 264,175	$ 284,935
Held-to-maturity	12,322	12,606
Mortgage servicing rights	669	465
Level 1
Financial assets:
Cash and cash equivalents	23,998	32,917
Investment securities:
Available-for-sale		9,999
Level 2
Investment securities:
Available-for-sale	264,175	274,936
Held-to-maturity	12,322	12,606
Accrued interest receivable	5,455	5,796
Mortgage servicing rights	1,543	1,543
Restricted equity securities	6,201	5,403
Financial liabilities:
Deposits	1,477,233	1,455,979
Short-term borrowings	60,338	38,325
Long-term debt	61,681	61,412
Accrued interest payable	506	560
Level 3
Investment securities:
Net loans	1,406,148	1,330,900
Carrying Value
Financial assets:
Cash and cash equivalents	23,998	32,917
Investment securities:
Available-for-sale	264,175	284,935
Held-to-maturity	11,681	12,109
Net loans	1,395,533	1,327,890
Accrued interest receivable	5,455	5,796
Mortgage servicing rights	669	465
Restricted equity securities	6,201	5,403
Assets, Fair Value Disclosure	1,707,712	1,669,515
Financial liabilities:
Deposits	1,475,459	1,455,810
Short-term borrowings	60,350	38,325
Long-term debt	59,773	60,354
Accrued interest payable	506	560
Liabilities, total	1,596,088	1,555,049
Fair Value
Financial assets:
Cash and cash equivalents	23,998	32,917
Investment securities:
Available-for-sale	264,175	284,935
Held-to-maturity	12,322	12,606
Net loans	1,406,148	1,330,900
Accrued interest receivable	5,455	5,796
Mortgage servicing rights	1,543	1,543
Restricted equity securities	6,201	5,403
Assets, Fair Value Disclosure	1,719,842	1,674,100
Financial liabilities:
Deposits	1,477,233	1,455,979
Short-term borrowings	60,338	38,325
Long-term debt	61,681	61,412
Accrued interest payable	506	560
Liabilities, total	$ 1,599,758	$ 1,556,276

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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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