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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities: |  |
Available-for-sale | $ 274,794 | $ 272,502
Common equity securities | 291 | 46
Held-to-maturity | 8,435 | 9,547
Loans held for sale | 98 | 106
Mortgage servicing rights | 731 | 728
Other assets | 64,573 | 64,469
Carrying Value |  |
Financial assets: |  |
Cash and cash equivalents | 40,595 | 37,488
Investment securities: |  |
Available-for-sale | 274,794 | 272,548
Common equity securities | 291 |
Held-to-maturity | 8,551 | 9,274
Loans held for sale | 98 | 106
Net loans | 1,759,032 | 1,674,105
Accrued interest receivable | 6,565 | 6,936
Mortgage servicing rights | 731 | 728
Restricted equity securities | 7,827 | 8,562
Interest rate swaps | 864 | 655
Total assets | 2,099,348 | 2,010,402
Financial liabilities: |  |
Deposits | 1,827,864 | 1,719,018
Short-term borrowings | 99,450 | 123,675
Long-term debt | 48,461 | 49,734
Accrued interest payable | 745 | 497
Interest rate swap | 841 | 733
Total liabilities | 1,977,361 | 1,893,657
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 40,595 | 37,488
Investment securities: |  |
Available-for-sale | 274,794 | 272,548
Common equity securities | 291 |
Held-to-maturity | 8,435 | 9,547
Loans held for sale | 98 | 106
Net loans | 1,706,913 | 1,645,292
Accrued interest receivable | 6,565 | 6,936
Mortgage servicing rights | 1,645 | 1,638
Restricted equity securities | 7,827 | 8,562
Interest rate swaps | 864 | 655
Total assets | 2,048,027 | 1,982,772
Financial liabilities: |  |
Deposits | 1,822,365 | 1,666,284
Short-term borrowings | 99,450 | 123,675
Long-term debt | 48,487 | 50,147
Accrued interest payable | 745 | 497
Interest rate swap | 841 | 733
Total liabilities | 1,971,888 | 1,841,336
Level 1 |  |
Financial assets: |  |
Cash and cash equivalents | 40,595 | 37,488
Investment securities: |  |
Available-for-sale | 25,230 | 19,860
Common equity securities | 291 |
Level 2 |  |
Investment securities: |  |
Available-for-sale | 249,564 | 252,688
Held-to-maturity | 8,435 | 9,547
Loans held for sale | 98 | 106
Accrued interest receivable | 6,565 | 6,936
Mortgage servicing rights | 1,645 | 1,638
Restricted equity securities | 7,827 | 8,562
Interest rate swaps | 864 | 655
Financial liabilities: |  |
Deposits | 1,822,365 | 1,666,284
Short-term borrowings | 99,450 | 123,675
Long-term debt | 48,487 | 50,147
Accrued interest payable | 745 | 497
Interest rate swap | 841 | 733
Level 3 |  |
Investment securities: |  |
Net loans | $ 1,706,913 | $ 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 receivable as of the balance sheet date. + 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 Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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 Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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