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Loans - Schedule of Net Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loan Portfolio By Loan Grade [Line Items]
Commercial, industrial, and agricultural	$ 853,495	$ 749,138
Commercial mortgages	683,979	600,065
Residential real estate	760,342	713,347
Credit cards	7,434	6,753
Overdrafts	325	352
Less: unearned discount	(4,508)	(3,889)
Less: allowance for loan losses	(22,510)	(19,693)
Net loans	2,364,445	2,126,266
Consumer Portfolio
Loan Portfolio By Loan Grade [Line Items]
Consumer	$ 85,888	$ 80,193

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Loan portfolio by loan grade.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of other revolving credit arrangements, for example, but not limited to, personal lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes home equity lines of credit and credit cards and loans and leases covered under loss sharing agreements.

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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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