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Fair value of financial instruments - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities: |  |
Available-for-sale | $ 272,548 | $ 259,410
Held-to-maturity | 9,547 | 10,714
Loans held for sale | 106 |
Mortgage servicing rights | 728 | 698
Other assets | 64,469 | 65,501
Carrying Value |  |
Financial assets: |  |
Cash and cash equivalents | 37,488 | 39,941
Investment securities: |  |
Available-for-sale | 272,548 | 259,410
Held-to-maturity | 9,274 | 10,517
Loans held for sale | 106 |
Net loans | 1,674,105 | 1,517,004
Accrued interest receivable | 6,936 | 6,228
Mortgage servicing rights | 728 | 698
Restricted equity securities | 8,562 | 7,051
Interest rate swaps | 655 |
Total assets | 2,010,402 | 1,840,849
Financial liabilities: |  |
Deposits | 1,719,018 | 1,588,757
Short-term borrowings | 123,675 | 82,700
Long-term debt | 49,734 | 58,134
Accrued interest payable | 497 | 462
Interest rate swaps | (733) |
Total liabilities | 1,893,657 | 1,730,053
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 37,488 | 39,941
Investment securities: |  |
Available-for-sale | 272,548 | 259,410
Held-to-maturity | 9,547 | 10,714
Loans held for sale | 106 |
Net loans | 1,645,292 | 1,507,936
Accrued interest receivable | 6,936 | 6,228
Mortgage servicing rights | 1,638 | 1,587
Restricted equity securities | 8,562 | 7,051
Other assets | 2,249 |
Interest rate swaps | 655 |
Total assets | 1,985,021 | 1,832,867
Financial liabilities: |  |
Deposits | 1,666,284 | 1,587,701
Short-term borrowings | 123,675 | 82,700
Long-term debt | 50,147 | 58,987
Accrued interest payable | 497 | 462
Interest rate swaps | (733) |
Total liabilities | 1,841,336 | 1,729,850
Level 1 |  |
Financial assets: |  |
Cash and cash equivalents | 37,488 | 39,941
Investment securities: |  |
Available-for-sale | 19,860 | 7,438
Level 2 |  |
Investment securities: |  |
Available-for-sale | 252,688 | 251,972
Held-to-maturity | 9,547 | 10,714
Loans held for sale | 106 |
Accrued interest receivable | 6,936 | 6,228
Mortgage servicing rights | 1,638 | 1,587
Restricted equity securities | 8,562 | 7,051
Interest rate swaps | 655 |
Financial liabilities: |  |
Deposits | 1,666,284 | 1,587,701
Short-term borrowings | 123,675 | 82,700
Long-term debt | 50,147 | 58,987
Accrued interest payable | 497 | 462
Interest rate swaps | (733) |
Level 3 |  |
Investment securities: |  |
Net loans | 1,645,292 | $ 1,507,936
Other assets | $ 2,249 |

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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 receivable as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value portion of interest rate swap liabilities held by the entity. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Amount of assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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