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Fair value estimates - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities: |  |
Available-for-sale | $ 264,175 | $ 284,935
Held-to-maturity | 12,322 | 12,606
Mortgage servicing rights | 669 | 465
Level 1 |  |
Financial assets: |  |
Cash and cash equivalents | 23,998 | 32,917
Investment securities: |  |
Available-for-sale |  | 9,999
Level 2 |  |
Investment securities: |  |
Available-for-sale | 264,175 | 274,936
Held-to-maturity | 12,322 | 12,606
Accrued interest receivable | 5,455 | 5,796
Mortgage servicing rights | 1,543 | 1,543
Restricted equity securities | 6,201 | 5,403
Financial liabilities: |  |
Deposits | 1,477,233 | 1,455,979
Short-term borrowings | 60,338 | 38,325
Long-term debt | 61,681 | 61,412
Accrued interest payable | 506 | 560
Level 3 |  |
Investment securities: |  |
Net loans | 1,406,148 | 1,330,900
Carrying Value |  |
Financial assets: |  |
Cash and cash equivalents | 23,998 | 32,917
Investment securities: |  |
Available-for-sale | 264,175 | 284,935
Held-to-maturity | 11,681 | 12,109
Net loans | 1,395,533 | 1,327,890
Accrued interest receivable | 5,455 | 5,796
Mortgage servicing rights | 669 | 465
Restricted equity securities | 6,201 | 5,403
Assets, Fair Value Disclosure | 1,707,712 | 1,669,515
Financial liabilities: |  |
Deposits | 1,475,459 | 1,455,810
Short-term borrowings | 60,350 | 38,325
Long-term debt | 59,773 | 60,354
Accrued interest payable | 506 | 560
Liabilities, total | 1,596,088 | 1,555,049
Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 23,998 | 32,917
Investment securities: |  |
Available-for-sale | 264,175 | 284,935
Held-to-maturity | 12,322 | 12,606
Net loans | 1,406,148 | 1,330,900
Accrued interest receivable | 5,455 | 5,796
Mortgage servicing rights | 1,543 | 1,543
Restricted equity securities | 6,201 | 5,403
Assets, Fair Value Disclosure | 1,719,842 | 1,674,100
Financial liabilities: |  |
Deposits | 1,477,233 | 1,455,979
Short-term borrowings | 60,338 | 38,325
Long-term debt | 61,681 | 61,412
Accrued interest payable | 506 | 560
Liabilities, total | $ 1,599,758 | $ 1,556,276

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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 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=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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- Definition The fair value amount of long-term debt 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. + References No definition available. + Details
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