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Employee Benefit Plans - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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