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Fair value estimates - Carrying and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment securities:
Available-for-sale	$ 350,825	$ 299,715
Held-to-maturity	15,516	17,175
Mortgage servicing rights	824	880
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	34,211	51,310
Investment securities:
Available-for-sale	48,061	1,097
Held-to-maturity
Loans held for sale
Net loans
Accrued interest receivable
Mortgage servicing rights
Restricted equity securities
Financial liabilities:
Deposits
Short-term borrowings
Long-term debt
Accrued interest payable
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents
Investment securities:
Available-for-sale	302,764	298,618
Held-to-maturity	15,516	17,175
Loans held for sale	2,961	1,757
Net loans
Accrued interest receivable	5,381	5,866
Mortgage servicing rights	1,440	1,440
Restricted equity securities	4,078	4,102
Financial liabilities:
Deposits	1,427,110	1,381,946
Short-term borrowings	6,514	22,052
Long-term debt	35,577	37,468
Accrued interest payable	597	723
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	1,179,677	1,180,387
Accrued interest receivable
Mortgage servicing rights
Restricted equity securities
Financial liabilities:
Deposits
Short-term borrowings
Long-term debt
Accrued interest payable
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	34,211	51,310
Investment securities:
Available-for-sale	350,825	299,715
Held-to-maturity	15,264	17,295
Loans held for sale	2,961	1,757
Net loans	1,169,771	1,167,966
Accrued interest receivable	5,381	5,866
Mortgage servicing rights	824	880
Restricted equity securities	4,078	4,102
Financial liabilities:
Deposits	1,425,628	1,379,507
Short-term borrowings	6,514	22,052
Long-term debt	34,020	36,743
Accrued interest payable	597	723
Fair Value [Member]
Financial assets:
Cash and cash equivalents	34,211	51,310
Investment securities:
Available-for-sale	350,825	299,715
Held-to-maturity	15,516	17,175
Loans held for sale	2,961	1,757
Net loans	1,179,677	1,180,387
Accrued interest receivable	5,381	5,866
Mortgage servicing rights	1,440	1,440
Restricted equity securities	4,078	4,102
Financial liabilities:
Deposits	1,427,110	1,381,946
Short-term borrowings	6,514	22,052
Long-term debt	35,577	37,468
Accrued interest payable	$ 597	$ 723

X

- 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.

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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

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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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.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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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.

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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.

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The aggregate value of all restricted investments.

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-SubTopic 320

-Section S99

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