Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts	3	1	5	2
Pre-Modification Outstanding Recorded Investment	$ 97	$ 422	$ 245	$ 547
Post-Modification Outstanding Recorded Investment	97	422	245	547
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts		1		2
Pre-Modification Outstanding Recorded Investment		422		547
Post-Modification Outstanding Recorded Investment		422		547
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts	3		5
Pre-Modification Outstanding Recorded Investment	97		245
Post-Modification Outstanding Recorded Investment	$ 97		$ 245