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Fair value estimates - Carrying and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities: |  |
Available-for-sale | $ 318,790 | $ 339,586
Held-to-maturity | 14,104 | 15,215
Mortgage servicing rights | 566 | 676
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 35,557 | 31,426
Investment securities: |  |
Available-for-sale | 30,685 | 48,550
Significant Other Observable Inputs (Level 2) [Member] |  |
Investment securities: |  |
Available-for-sale | 288,105 | 291,036
Held-to-maturity | 14,104 | 15,215
Loans held for sale | 2,883 | 3,492
Accrued interest receivable | 5,507 | 5,580
Mortgage servicing rights | 1,227 | 1,466
Restricted equity securities | 3,357 | 3,687
Financial liabilities: |  |
Deposits | 1,425,821 | 1,427,081
Short-term borrowings | 25,860 | 19,557
Long-term debt | 33,145 | 34,772
Accrued interest payable | 443 | 574
Significant Unobservable Inputs (Level 3) [Member] |  |
Investment securities: |  |
Net loans | 1,229,055 | 1,210,369
Carrying Value [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 35,557 | 31,426
Investment securities: |  |
Available-for-sale | 318,790 | 339,586
Held-to-maturity | 13,626 | 14,665
Loans held for sale | 2,879 | 3,486
Net loans | 1,220,113 | 1,199,556
Accrued interest receivable | 5,507 | 5,580
Mortgage servicing rights | 566 | 676
Restricted equity securities | 3,357 | 3,687
Assets, Fair Value Disclosure | 1,600,395 | 1,598,662
Financial liabilities: |  |
Deposits | 1,424,767 | 1,425,558
Short-term borrowings | 25,860 | 19,557
Long-term debt | 31,663 | 33,140
Accrued interest payable | 443 | 574
Liabilities, total | 1,482,733 | 1,478,829
Fair Value [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 35,557 | 31,426
Investment securities: |  |
Available-for-sale | 318,790 | 339,586
Held-to-maturity | 14,104 | 15,215
Loans held for sale | 2,883 | 3,492
Net loans | 1,229,055 | 1,210,369
Accrued interest receivable | 5,507 | 5,580
Mortgage servicing rights | 1,227 | 1,466
Restricted equity securities | 3,357 | 3,687
Assets, Fair Value Disclosure | 1,610,480 | 1,610,821
Financial liabilities: |  |
Deposits | 1,425,821 | 1,427,081
Short-term borrowings | 25,860 | 19,557
Long-term debt | 33,145 | 34,772
Accrued interest payable | 443 | 574
Liabilities, total | $ 1,485,269 | $ 1,481,984

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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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