Fair Value Disclosures - Financial Statements at Estimated Fair Values (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial Assets
Cash and due from banks	$ 15,524	$ 12,995
Interest bearing deposits with banks	20,213	24,565
Restricted investments in bank stock	9,334	9,921
Securities available for sale	402,563	406,943
Loans held for sale	4,164	1,936
Accrued interest receivable	3,151	3,400
Financial Liabilities
Deposits	989,234	1,000,390
Short-term borrowings	56,279	59,032
Long-term debt	14,986	16,077
Carrying Amount [Member]
Financial Assets
Cash and due from banks	15,524	12,995
Interest bearing deposits with banks	20,213	24,565
Restricted investments in bank stock	9,334	9,921
Securities available for sale	402,563	406,943
Loans held for sale	4,164	1,936
Loans, net of allowance for loan losses	664,355	650,072
Accrued interest receivable	3,151	3,400
Mortgage servicing rights	2,730	2,806
Financial Liabilities
Deposits	989,234	1,000,390
Short-term borrowings	56,279	59,032
Long-term debt	14,986	16,077
Accrued interest payable	271	333
Off-balance sheet instruments	0	0
Fair Value [Member]
Financial Assets
Cash and due from banks	15,524	12,995
Interest bearing deposits with banks	20,213	24,565
Securities available for sale	402,563	406,943
Loans held for sale	4,164	1,936
Loans, net of allowance for loan losses	670,934	655,122
Accrued interest receivable	3,151	3,400
Mortgage servicing rights	2,892	3,090
Financial Liabilities
Deposits	990,207	1,002,235
Short-term borrowings	56,127	59,032
Long-term debt	15,734	16,645
Accrued interest payable	271	333
Off-balance sheet instruments	0	0
Fair Value [Member] \| Level 1 [Member]
Financial Assets
Cash and due from banks	15,524	12,995
Interest bearing deposits with banks	20,213	24,565
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
Fair Value [Member] \| Level 2 [Member]
Financial Assets
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Securities available for sale	402,563	406,943
Loans held for sale	4,164	1,936
Loans, net of allowance for loan losses	0	0
Accrued interest receivable	1,554	1,902
Mortgage servicing rights	0	0
Financial Liabilities
Deposits	990,207	1,002,235
Short-term borrowings	56,127	59,032
Long-term debt	15,734	16,645
Accrued interest payable	271	333
Off-balance sheet instruments	0	0
Fair Value [Member] \| Level 3 [Member]
Financial Assets
Cash and due from banks	0	0
Interest bearing deposits with banks	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net of allowance for loan losses	670,934	655,122
Accrued interest receivable	1,597	1,498
Mortgage servicing rights	2,892	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

Mortgage servicing rights carrying value.

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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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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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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 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 classified as loans attributable to disposal group held for sale or disposed of. 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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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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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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