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Loans - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) Loans	Sep. 30, 2014 Loans	Sep. 30, 2015 USD ($) Loans	Sep. 30, 2014 Loans	Dec. 31, 2014 USD ($) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net unamortized loan fees and costs	$ (160,000)		$ (160,000)		$ 483,000
Percentage of comprised loan, commercial, industrial and agricultural loans	30.00%		30.00%		32.00%
Percentage of comprised loan, commercial mortgage loans	28.00%		28.00%		26.00%
Risk rating to commercial loans	$ 250,000,000		$ 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	37.00%		37.00%		37.00%
Number of Loans | Loans			15		15
Minimum period to be considered for loan to have defaulted			90 days
Principal balances forgiven in connection with loan restructuring	$ 0		$ 0		$ 0
Outstanding balance of semi annual loans			Greater than $1 million
Outstanding balance of annual loans			Less than $1 million
Trouble Debt Restructuring [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | Loans	0	0	0	0
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of consumer loan and credit card in portfolio	10.00%		10.00%		10.00%

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

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Minimum risk rating category of commercial loans.

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Outstanding balance of annual loans.

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 33



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 20



-Section 45



-Paragraph 1



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