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Employee Benefit Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Employees shares	Dec. 31, 2014 USD ($) Employees shares	Dec. 31, 2013 USD ($) Employees shares
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 | $	$ 835	$ 779	$ 670
Restricted stock awards, shares issued	16,000	13,250	11,000
Expense for restricted stock awards | $	$ 314	$ 232	$ 253
Awards grants originated in 2012, 2013 and 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, received the stock | Employees	1
One employee received shares from awards granted due to retirement	250
Number of shares paid to estate of deceased employee	325
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock issued to number of employees | Employees	67	61	53
Shares vest under the plan	100.00%	100.00%	100.00%
Shares forfeited due to employee termination	100	780	620
Number of shares vested	10,295	10,970	9,160
Number of employees, received the stock | Employees	45	48	45
Compensation expense | $	$ 286	$ 252	$ 235
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan | $	$ 591
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] | 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested		10,005
Restricted Stock Awards [Member] | 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested	9,720

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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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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 Employee Share Issued

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

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Shares paid to estate of deceased employee upon retirement.

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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
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-SubTopic 10
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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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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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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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

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