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Loans - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended	12 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2014 Loans	Sep. 30, 2013	Dec. 31, 2013 Loans	Sep. 30, 2014 Trouble Debt Restructuring [Member] Loans	Sep. 30, 2013 Trouble Debt Restructuring [Member] Loans	Sep. 30, 2014 Trouble Debt Restructuring [Member] Loans	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]	Dec. 31, 2013 Maximum [Member]	Sep. 30, 2013 Commercial Mortgage Loan One [Member]	Mar. 31, 2013 Commercial Mortgage Loan One [Member]	Sep. 30, 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]	Jun. 30, 2014 Commercial, Industrial, and Agricultural [Member]	Sep. 30, 2014 Commercial, Industrial, and Agricultural [Member] Special Mention [Member]	Sep. 30, 2014 Commercial, Industrial, and Agricultural [Member] Substandard [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		$ 657,000		$ 911,000
Percentage of comprised loan, commercial, industrial and agricultural loans		32.00%		33.00%
Percentage of comprised loan, commercial mortgage loans		26.00%		27.00%
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%		36.00%
Maximum percentage of consumer loan and credit card in portfolio									10.00%	10.00%
Loans held for sale		1,300,000
Loan portfolio segment reclassification																66,000,000	70,000,000			54,000,000	12,000,000
Number of Loans		12		12	0	0	2
Allowance for loan losses increases	562,000		562,000
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 restructurings		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											127,000		262,000	615,000
Outstanding balance of semi annual loans		Greater than $1 million
Outstanding balance of annual loans		Less than $1 million
Increase (Decrease) in loans after reclassification																		$ 3,000,000	$ 10,600,000

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Amount of increase (decrease) of allowance reserve for credit loss.

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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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