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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment securities:
Available-for-sale	$ 256,774	$ 259,410
Held-to-maturity	10,221	10,714
Mortgage servicing rights	707	698
Carrying Value
Financial assets:
Cash and cash equivalents	41,401	39,941
Investment securities:
Available-for-sale	256,774	259,410
Held-to-maturity	9,868	10,517
Net loans	1,579,560	1,517,004
Accrued interest receivable	6,206	6,228
Mortgage servicing rights	707	698
Restricted equity securities	7,754	7,051
Total assets	1,902,270	1,840,849
Financial liabilities:
Deposits	1,639,433	1,588,757
Short-term borrowings	91,500	82,700
Long-term debt	57,160	58,134
Accrued interest payable	431	462
Total liabilities	1,788,524	1,730,053
Fair Value
Financial assets:
Cash and cash equivalents	41,401	39,941
Investment securities:
Available-for-sale	256,774	259,410
Held-to-maturity	10,221	10,714
Net loans	1,567,146	1,507,936
Accrued interest receivable	6,206	6,228
Mortgage servicing rights	1,607	1,587
Restricted equity securities	7,754	7,051
Total assets	1,891,109	1,832,867
Financial liabilities:
Deposits	1,638,514	1,587,701
Short-term borrowings	91,500	82,700
Long-term debt	58,053	58,987
Accrued interest payable	431	462
Total liabilities	1,788,498	1,729,850
Level 1
Financial assets:
Cash and cash equivalents	41,401	39,941
Investment securities:
Available-for-sale	20,080	7,438
Level 2
Investment securities:
Available-for-sale	236,694	251,972
Held-to-maturity	10,221	10,714
Accrued interest receivable	6,206	6,228
Mortgage servicing rights	1,607	1,587
Restricted equity securities	7,754	7,051
Financial liabilities:
Deposits	1,638,514	1,587,701
Short-term borrowings	91,500	82,700
Long-term debt	58,053	58,987
Accrued interest payable	431	462
Level 3
Investment securities:
Net loans	$ 1,567,146	$ 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 aggregate value of all restricted investments.

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