Fair Value Disclosures - Financial Instruments at Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financial Assets
Cash and due from banks	$ 16,707	$ 12,995
Interest bearing deposits with banks	13,650	24,565
Restricted investments in bank stock	9,014	9,921
Securities available for sale	431,786	406,943
Loans held for sale	2,652	1,936
Accrued interest receivable	3,313	3,400
Financial Liabilities
Deposits	1,002,405	1,000,390
Short-term borrowings	48,821	59,032
Long-term debt	25,718	16,077
Level 1 [Member]
Financial Assets
Cash and due from banks	16,707	12,995
Interest bearing deposits with banks	13,650	24,565
Restricted investments in bank stock	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net of allowance for loan losses	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial Liabilities
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Off-balance sheet instruments	0	0
Level 2 [Member]
Financial Assets
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Restricted investments in bank stock	0	0
Securities available for sale	431,786	406,943
Loans held for sale	2,652	1,936
Loans, net of allowance for loan losses	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial Liabilities
Deposits	1,004,122	1,002,235
Short-term borrowings	48,821	59,032
Long-term debt	26,328	16,645
Accrued interest payable	339	333
Off-balance sheet instruments	0	0
Level 3 [Member]
Financial Assets
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Restricted investments in bank stock	9,014	9,921
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net of allowance for loan losses	656,884	655,122
Accrued interest receivable	3,313	3,400
Mortgage servicing rights	3,013	3,090
Financial Liabilities
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Off-balance sheet instruments	0	0
Fair Value [Member]
Financial Assets
Cash and due from banks	16,707	12,995
Interest bearing deposits with banks	13,650	24,565
Restricted investments in bank stock	9,014	9,921
Securities available for sale	431,786	406,943
Loans held for sale	2,652	1,936
Loans, net of allowance for loan losses	656,884	655,122
Accrued interest receivable	3,313	3,400
Mortgage servicing rights	3,013	3,090
Financial Liabilities
Deposits	1,004,122	1,002,235
Short-term borrowings	48,821	59,032
Long-term debt	26,328	16,645
Accrued interest payable	339	333
Off-balance sheet instruments	0	0
Carrying Amount [Member]
Financial Assets
Cash and due from banks	16,707	12,995
Interest bearing deposits with banks	13,650	24,565
Restricted investments in bank stock	9,014	9,921
Securities available for sale	431,786	406,943
Loans held for sale	2,652	1,936
Loans, net of allowance for loan losses	652,785	650,072
Accrued interest receivable	3,313	3,400
Mortgage servicing rights	2,767	2,806
Financial Liabilities
Deposits	1,002,405	1,000,390
Short-term borrowings	48,821	59,032
Long-term debt	25,718	16,077
Accrued interest payable	339	333
Off-balance sheet instruments	$ 0	$ 0

Interest payable fair value.

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Interest receivable fair value.

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Mortgage servicing rights carrying value.

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Mortgage servicing rights fair value disclosure.

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Off balance sheet risks amount liability carrying value.

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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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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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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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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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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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No definition available.

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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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Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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No definition available.

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The aggregate value of all restricted investments.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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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 the amount of short-term debt existing as of the balance sheet date.

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