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Loans - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Contracts	Jun. 30, 2012 Contracts	Jun. 30, 2013 Loans	Jun. 30, 2012	Dec. 31, 2012 Loans	Jun. 30, 2013 Commercial Mortgage Loan One [Member]	Mar. 31, 2013 Commercial Mortgage Loan One [Member]	Jun. 30, 2013 Commercial Mortgage Loan One [Member]	Dec. 31, 2012 Commercial Mortgage Loan One [Member]	Jun. 30, 2013 Commercial Mortgage Loan Two [Member]	Jun. 30, 2013 Commercial Mortgage Loan Two [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net unamortized loan costs and fees	$ 105,000		$ 105,000		$ 232,000
Number of contract modified as troubled debt restructuring	0	0	11		10
Additional provision for loan losses	0	0	0	0		0		135,000		588,000	588,000
Reduction in Stated Interest rate modification having loan range period												4 years	15 years
Extension of Maturity date modification having loan range period												4 years	18 years
Principal balances forgiven in connection with loan restructuring	0		0		0
Troubled debt restructuring charged off							595,000
Commercial mortgage loan balance amount									1,660,000	1,086,000
Minimum period to be considered for loan to have defaulted			90 days
Outstanding balance of semi annual loans			Greater than $1 million
Outstanding balance of annual Loans			Less than $1 million
Percentage of comprised loan, commercial, industrial and agricultural loans	27.00%		27.00%		28.00%
Percentage of comprised loan, commercial mortgage loans	29.00%		29.00%		28.00%
Risk rating to commercial loans	$ 250,000		$ 250,000
Percentage of loan-to-value to business equipment			80.00%
Percentage of loan-to-value to accounts receivable			75.00%
Percentage of loan-to-value to business inventory			60.00%
Percentage of loan-to-value to real estate			85.00%
Percentage of residential real estate loan in portfolio	38.00%		38.00%		37.00%
Maximum percentage of consumer loan and credit card in portfolio	10.00%		10.00%		10.00%

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Commercial mortgage loan amount as maximum percentage of appraised real estate value.

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Minimum period to be considered for loan to have defaulted.

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Out standing balance of annual loans.

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Outstanding balance of semi annual loans.

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Percentage of commercial industrial and agricultural loans in loan portfolio.

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Percentage of commercial mortgage loans in loan portfolio.

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Percentage of consumer loans and credit card products in loan portfolio.

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Percentage of residential real estate loans in loan portfolio.

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Number of financing receivables that have been modified by troubled debt restructurings.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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