Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number	1	1
Balance | $	$ 111	$ 32
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number	1
Balance | $	$ 111
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number		1
Balance | $		$ 32