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Fair value of financial instruments - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment securities:
Available-for-sale	$ 269,682	$ 272,502
Common equity securities	291	46
Held-to-maturity	8,380	9,547
Loans held for sale	749	106
Mortgage servicing rights	718	728
Other assets	63,737	64,469
Carrying Value
Financial assets:
Cash and cash equivalents	32,616	37,488
Investment securities:
Available-for-sale	269,682	272,548
Common equity securities	291
Held-to-maturity	8,361	9,274
Loans held for sale	749	106
Net loans	1,801,887	1,674,105
Accrued interest receivable	7,115	6,936
Mortgage servicing rights	718	728
Restricted equity securities	7,462	8,562
Interest rate floor	553
Interest rate swaps	108	655
Total assets	2,129,542	2,010,402
Financial liabilities:
Deposits	1,875,022	1,719,018
Short-term borrowings	86,500	123,675
Long-term debt	37,906	49,734
Accrued interest payable	1,195	497
Interest rate swap	138	733
Total liabilities	2,000,761	1,893,657
Fair Value
Financial assets:
Cash and cash equivalents	32,616	37,488
Investment securities:
Available-for-sale	269,682	272,548
Common equity securities	291
Held-to-maturity	8,380	9,547
Loans held for sale	749	106
Net loans	1,762,449	1,645,292
Accrued interest receivable	7,115	6,936
Mortgage servicing rights	1,710	1,638
Restricted equity securities	7,462	8,562
Interest rate floor	553
Interest rate swaps	108	655
Total assets	2,091,115	1,982,772
Financial liabilities:
Deposits	1,874,520	1,666,284
Short-term borrowings	86,500	123,675
Long-term debt	38,071	50,147
Accrued interest payable	1,195	497
Interest rate swap	138	733
Total liabilities	2,000,424	1,841,336
Level 1
Financial assets:
Cash and cash equivalents	32,616	37,488
Investment securities:
Available-for-sale	25,592	19,860
Common equity securities	291
Level 2
Investment securities:
Available-for-sale	244,090	252,688
Held-to-maturity	8,380	9,547
Loans held for sale	749	106
Accrued interest receivable	7,115	6,936
Mortgage servicing rights	1,710	1,638
Restricted equity securities	7,462	8,562
Interest rate floor	553
Interest rate swaps	108	655
Financial liabilities:
Deposits	1,874,520	1,666,284
Short-term borrowings	86,500	123,675
Long-term debt	38,071	50,147
Accrued interest payable	1,195	497
Interest rate swap	138	733
Level 3
Investment securities:
Net loans	$ 1,762,449	$ 1,645,292

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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 floor interest rate swaps.

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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 security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of financial and nonfinancial obligations.

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