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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percentage of eligible compensation on a pre-tax basis for eligible employees to save	1.00%
Employee contribution matching percentage	50.00%
Percentage of total eligible compensation, contribution by Bank, maximum limit	4.00%
Vesting percentage in participant's deferral contributions and employer matching contributions	100.00%
Vesting period	6 years
Employer matching contribution and the discretionary contribution	$ 670	$ 744	$ 680
Restricted stock awards, shares issued	11,000	11,000	11,000
Compensation expense	253	217	182
Awards grants originated in 2009, 2010 and 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, received the stock	1
One employee received shares from awards granted due to retirement	210
Awards grants originated in 2008, 2009 and 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, received the stock	3
Three employees received shares from awards granted due to retirement	557
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted stock awards, shares issued	11,000	11,000	11,000
Stock issued to number of employees	53	54	56
Shares vest under the plan	100.00%	100.00%	100.00%
Shares forfeited due to employee termination	620	1,135	778
Number of shares vested	9,160	8,910	9,432
Number of employees, received the stock	45	41	44
Compensation expense	253	219	202
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan	$ 366
Restricted Stock Awards [Member] | 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested		8,700
Restricted Stock Awards [Member] | 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested	9,160
Restricted Stock Awards [Member] | 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested			8,875

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- Definition

Minimum Percentage Of Eligible Compensation On Pre Tax Basis For Eligible Employees To Save

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Number Of Awards Granted To One Employee On Retirement

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Number Of Awards Granted To Three Employee On Retirement

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Vested Percentage

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Employees

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Employee Share Issued

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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