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Merger - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 06, 2015	Jun. 30, 2015	Mar. 05, 2015	Dec. 31, 2014
Business Combinations [Line Items]
Goodwill		$ 26,841		$ 21,720
TCNB Financial Corp [Member]
Business Combinations [Line Items]
Cash paid for acquisition	$ 17,226
Acquisition value per share	$ 23.50
Total assets of TCNB prior to the merger			$ 97,479
Assets, loan	$ 76,830		76,771
Assets, Deposit			86,708
Goodwill	5,121		$ 5,121
Cash and short-term investments acquired	18,152
Deposits acquired	$ 86,700
Minimum [Member]
Business Combinations [Line Items]
Core deposit intangibles and other intangibles, amortization period	5 years
Maximum [Member]
Business Combinations [Line Items]
Core deposit intangibles and other intangibles, amortization period	10 years

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