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Loans - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) Loans	Jun. 30, 2016 Loans	Jun. 30, 2017 USD ($) Loans	Jun. 30, 2016 Loans	Dec. 31, 2016 USD ($) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net unamortized loan (fees) costs	$ (2,347,000)		$ (2,347,000)		$ (1,507,000)
Percentage of comprised loan, commercial, industrial and agricultural loans	31.00%		31.00%		30.00%
Percentage of comprised loan, commercial mortgage loans	31.00%		31.00%		31.00%
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	34.00%		34.00%		35.00%
Number of Loans | Loans			14		15
Minimum period to be considered for loan to have defaulted			90 days
Principal balances forgiven in connection with loan restructuring	$ 0		$ 0		$ 0
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%
Minimum [Member] | Commercial And Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment threshold			$ 250,000

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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 equipment.

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

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Minimum period to be considered for loan to have defaulted.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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