Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Segment Office	Sep. 30, 2013	Dec. 31, 2013
Accounting Policies [Line Items]
Number of offices in which the company operates throughout the country			22
Maturity of interest bearing deposits			90 days
Impairment charge related to investment			$ 0
Held to maturity or trading securities	0		0		0
Debt securities other than temporarily impaired	0		0		0
Contractual term of loans, reasonable period			9 months
Balance of loans serviced for others	316,365,000		316,365,000		322,653,000
Foreclosed real estate totaled	1,128,000		1,128,000		987,000
Advertising expense	120,000	142,000	486,000	319,000
Percentage of deferred tax assets			50.00%
Accumulated other comprehensive income (loss), net of taxes	$ 55,000		$ 55,000		$ (4,813,000)
Number of operating significant segment			1
Minimum [Member] | Building and Improvements [Member]
Accounting Policies [Line Items]
Plant and equipment, useful life			10 years
Minimum [Member] | Furniture and Equipment [Member]
Accounting Policies [Line Items]
Plant and equipment, useful life			3 years
Maximum [Member]
Accounting Policies [Line Items]
Cash and cash equivalents, original maturities			90 days
Maximum [Member] | Building and Improvements [Member]
Accounting Policies [Line Items]
Plant and equipment, useful life			40 years
Maximum [Member] | Furniture and Equipment [Member]
Accounting Policies [Line Items]
Plant and equipment, useful life			15 years