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Loans - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Dec. 31, 2013 Maximum [Member]	Mar. 31, 2013 Commercial Mortgage Loan One [Member]	Dec. 31, 2013 Commercial Mortgage Loan One [Member]	Dec. 31, 2012 Commercial Mortgage Loan One [Member]	Mar. 31, 2014 Commercial, Industrial, and Agricultural [Member]	Mar. 31, 2014 Commercial Mortgages [Member]	Mar. 31, 2014 Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net unamortized loan costs and fees	$ 870,000	$ 911,000
Percentage of comprised loan, commercial, industrial and agricultural loans	28.00%	28.00%
Percentage of comprised loan, commercial mortgage loans	32.00%	32.00%
Risk rating to commercial loans	250,000,000
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	36.00%	36.00%
Maximum percentage of consumer loan and credit card in portfolio				10.00%	10.00%
Loan portfolio segment reclassification									66,000,000	54,000,000	12,000,000
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
Minimum period to be considered for loan to have defaulted	90 days
Principal balances forgiven in connection with loan restructuring	0	0
Troubled debt restructuring charged off						595,000
Commercial mortgage loan balance amount							1,086,000	1,660,000
Additional provision for loan losses						$ 135,000	$ 615,000
Outstanding balance of semi annual loans	Greater than $1 million
Outstanding balance of annual loans	Less than $1 million

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Additional provision for loan losses.

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Commercial industrial and agricultural loan amount as maximum percentage of accounts receivable.

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Commercial industrial and agricultural loan amount as maximum percentage of business inventory.

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

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Loans segment reclassification adjustments.

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Minimum period to be considered for loan to have defaulted.

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Minimum risk rating category of commercial loans.

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Modification involving extension of maturity date having loan period.

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Modification involving reduction of stated interest rate having loan period.

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Outstanding 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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Troubled debt restructuring loan principal balance forgiven.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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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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