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Fair value estimates - Carrying and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investment securities: |  |
Available-for-sale | $ 302,226 | $ 299,715
Held-to-maturity | 16,597 | 17,175
Mortgage servicing rights | 833 | 880
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 79,212 | 51,310
Investment securities: |  |
Available-for-sale | 1,093 | 1,097
Held-to-maturity |  |
Loans held for sale |  |
Net loans |  |
Accrued interest receivable |  |
Mortgage servicing rights |  |
Restricted equity securities |  |
Assets, Fair Value Disclosure |  |
Financial liabilities: |  |
Deposits |  |
Short-term borrowings |  |
Long-term debt |  |
Accrued interest payable |  |
Liabilities, total |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Financial assets: |  |
Cash and cash equivalents |  |
Investment securities: |  |
Available-for-sale | 301,133 | 298,618
Held-to-maturity | 16,597 | 17,175
Loans held for sale | 1,816 | 1,757
Net loans |  |
Accrued interest receivable | 5,366 | 5,866
Mortgage servicing rights | 1,440 | 1,440
Restricted equity securities | 3,858 | 4,102
Assets, Fair Value Disclosure |  |
Financial liabilities: |  |
Deposits | 1,406,423 | 1,381,946
Short-term borrowings | 22,539 | 22,052
Long-term debt | 37,561 | 37,468
Accrued interest payable | 610 | 723
Liabilities, total |  |
Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets: |  |
Cash and cash equivalents |  |
Investment securities: |  |
Available-for-sale |  |
Held-to-maturity |  |
Loans held for sale |  |
Net loans | 1,179,290 | 1,180,387
Accrued interest receivable |  |
Mortgage servicing rights |  |
Restricted equity securities |  |
Assets, Fair Value Disclosure |  |
Financial liabilities: |  |
Deposits |  |
Short-term borrowings |  |
Long-term debt |  |
Accrued interest payable |  |
Liabilities, total |  |
Carrying Value [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 79,212 | 51,310
Investment securities: |  |
Available-for-sale | 302,226 | 299,715
Held-to-maturity | 16,607 | 17,295
Loans held for sale | 1,816 | 1,757
Net loans | 1,168,263 | 1,167,966
Accrued interest receivable | 5,366 | 5,866
Mortgage servicing rights | 833 | 880
Restricted equity securities | 3,858 | 4,102
Assets, Fair Value Disclosure | 1,578,181 | 1,548,891
Financial liabilities: |  |
Deposits | 1,404,066 | 1,379,507
Short-term borrowings | 22,539 | 22,052
Long-term debt | 35,838 | 36,743
Accrued interest payable | 610 | 723
Liabilities, total | 1,463,053 | 1,439,025
Fair Value [Member] |  |
Financial assets: |  |
Cash and cash equivalents | 79,212 | 51,310
Investment securities: |  |
Available-for-sale | 302,226 | 299,715
Held-to-maturity | 16,597 | 17,175
Loans held for sale | 1,816 | 1,757
Net loans | 1,179,290 | 1,180,387
Accrued interest receivable | 5,366 | 5,866
Mortgage servicing rights | 1,440 | 1,440
Restricted equity securities | 3,858 | 4,102
Assets, Fair Value Disclosure | 1,589,805 | 1,561,752
Financial liabilities: |  |
Deposits | 1,406,423 | 1,381,946
Short-term borrowings | 22,539 | 22,052
Long-term debt | 37,561 | 37,468
Accrued interest payable | 610 | 723
Liabilities, total | $ 1,467,133 | $ 1,442,189

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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 payable as of the balance sheet date. + References No definition available. + Details
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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=25499696&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=28360136&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=6871852&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=25499696&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 -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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- Definition The aggregate value of all restricted investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.9(c)) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.6(c)) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 9 -Subparagraph c -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 6 -Subparagraph c -Article 12 + Details
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