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Employee Benefit Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Employees shares	Dec. 31, 2015 USD ($) Employees shares	Dec. 31, 2014 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 | $	$ 877	$ 835	$ 779
Restricted stock awards, shares issued	16,150	16,000	13,250
Number of employees, received the stock | Employees			2
Number of shares granted due to retirement			965
Expense for restricted stock awards | $	$ 402	$ 314	$ 232
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
Awards grants originated in 2013, 2014 and 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, received the stock | Employees	4
One employee received shares from awards granted due to retirement	1,197
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	74	67	61
Shares vest under the plan	100.00%	100.00%	100.00%
Shares forfeited due to employee termination	773	100	780
Number of shares vested	11,222	10,295	10,970
Number of employees, received the stock | Employees	45	45	48
Compensation expense | $	$ 379	$ 286	$ 252
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan | $	$ 730
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
Restricted Stock Awards [Member] | 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested	10,025

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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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Number of awards granted to two employees on retirement.

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

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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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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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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