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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities: |  |
Available-for-sale, Fair Value | $ 264,644 | $ 259,410
Held-to-maturity, Fair value | 10,359 | 10,714
Mortgage servicing rights | 698 | 698
Carrying Value |  |
Financial assets: |  |
Cash and cash equivalents | 31,815 | 39,941
Investment securities: |  |
Available-for-sale, Fair Value | 264,644 | 259,410
Held-to-maturity, Fair value | 10,180 | 10,517
Loans held for sale | 444 |
Net loans | 1,542,898 | 1,517,004
Accrued interest receivable | 5,604 | 6,228
Mortgage servicing rights | 698 | 698
Restricted equity securities | 6,781 | 7,051
Assets, Fair Value Disclosure | 1,863,064 | 1,840,849
Financial liabilities: |  |
Deposits | 1,615,544 | 1,588,757
Short-term borrowings | 77,475 | 82,700
Long-term debt | 57,615 | 58,134
Accrued interest payable | 457 | 462
Liabilities, total | 1,751,091 | 1,730,053
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 31,815 | 39,941
Investment securities: |  |
Available-for-sale, Fair Value | 264,644 | 259,410
Held-to-maturity, Fair value | 10,359 | 10,714
Loans held for sale | 453 |
Net loans | 1,529,464 | 1,507,936
Accrued interest receivable | 5,604 | 6,228
Mortgage servicing rights | 1,587 | 1,587
Restricted equity securities | 6,781 | 7,051
Assets, Fair Value Disclosure | 1,850,707 | 1,832,867
Financial liabilities: |  |
Deposits | 1,614,470 | 1,587,701
Short-term borrowings | 77,475 | 82,700
Long-term debt | 58,484 | 58,987
Accrued interest payable | 457 | 462
Liabilities, total | 1,750,886 | 1,729,850
Level 1 |  |
Financial assets: |  |
Cash and cash equivalents | 31,815 | 39,941
Investment securities: |  |
Available-for-sale, Fair Value | 19,895 | 7,438
Level 2 |  |
Investment securities: |  |
Available-for-sale, Fair Value | 244,749 | 251,972
Held-to-maturity, Fair value | 10,359 | 10,714
Loans held for sale | 453 |
Accrued interest receivable | 5,604 | 6,228
Mortgage servicing rights | 1,587 | 1,587
Restricted equity securities | 6,781 | 7,051
Financial liabilities: |  |
Deposits | 1,614,470 | 1,587,701
Short-term borrowings | 77,475 | 82,700
Long-term debt | 58,484 | 58,987
Accrued interest payable | 457 | 462
Level 3 |  |
Investment securities: |  |
Net loans | $ 1,529,464 | $ 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 receivable as of the balance sheet date. + 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=36462937&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=51813488&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=27724398&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=49167202&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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + 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=27724398&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=27724398&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=27724398&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=36462937&loc=d3e19207-110258 + 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 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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