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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment securities:
Available-for-sale	$ 259,138	$ 259,410
Held-to-maturity	9,912	10,714
Mortgage servicing rights	728	698
Carrying Value
Financial assets:
Cash and cash equivalents	32,906	39,941
Investment securities:
Available-for-sale	259,686	259,410
Held-to-maturity	9,564	10,517
Loans held for sale	460
Net loans	1,613,684	1,517,004
Accrued interest receivable	5,908	6,228
Mortgage servicing rights	728	698
Restricted equity securities	6,341	7,051
Interest rate swaps	548
Total assets	1,929,825	1,840,849
Financial liabilities:
Deposits	1,687,855	1,588,757
Short-term borrowings	71,900	82,700
Long-term debt	50,199	58,134
Accrued interest payable	481	462
Interest rate swap	603
Total liabilities	1,811,038	1,730,053
Fair Value
Financial assets:
Cash and cash equivalents	32,906	39,941
Investment securities:
Available-for-sale	259,686	259,410
Held-to-maturity	9,912	10,714
Loans held for sale	460
Net loans	1,595,623	1,507,936
Accrued interest receivable	5,908	6,228
Mortgage servicing rights	1,655	1,587
Restricted equity securities	6,341	7,051
Interest rate swaps	548
Total assets	1,912,579	1,832,867
Financial liabilities:
Deposits	1,686,678	1,587,701
Short-term borrowings	71,900	82,700
Long-term debt	50,984	58,987
Accrued interest payable	481	462
Interest rate swap	603
Total liabilities	1,810,646	1,729,850
Level 1
Financial assets:
Cash and cash equivalents	32,906	39,941
Investment securities:
Available-for-sale	20,076	7,438
Level 2
Investment securities:
Available-for-sale	239,610	251,972
Held-to-maturity	9,912	10,714
Loans held for sale	460
Accrued interest receivable	5,908	6,228
Mortgage servicing rights	1,655	1,587
Restricted equity securities	6,341	7,051
Interest rate swaps	548
Financial liabilities:
Deposits	1,686,678	1,587,701
Short-term borrowings	71,900	82,700
Long-term debt	50,984	58,987
Accrued interest payable	481	462
Interest rate swap	603
Level 3
Investment securities:
Net loans	$ 1,595,623	$ 1,507,936

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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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Investment Securities [Abstract]

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Mortgage servicing rights (MSR) refer to a contractual agreement where the right, or rights, to service an existing mortgage are sold by the original lender to another party who specializes in the various functions of servicing mortgages.

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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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 portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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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 fair value amount of long-term debt 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.

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The aggregate value of all restricted investments.

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