Loans - Loan balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 06, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 1,002,917		$ 914,857
Allowance for loan losses	(14,707)		(14,268)
Net loans	988,210		900,589
Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	128,972		114,186
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	169,600		143,014
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	331,830		308,666
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	282,612		268,510
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	68,734		65,452
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 21,169		$ 15,029
TCNB Financial Corp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans		$ 76,830
TCNB Financial Corp [Member] | Commercial and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		13,799
TCNB Financial Corp [Member] | Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		23,029
TCNB Financial Corp [Member] | Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		13,808
TCNB Financial Corp [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		17,541
TCNB Financial Corp [Member] | Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		3,863
TCNB Financial Corp [Member] | Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans		$ 4,790