The following performance information provides an indication of the risks of investing in the Fund. Past performance does not indicate how the Fund will perform in the future. The Calendar Year Total Returns chart shows performance year-by-year over the last ten years (Investment Class used for illustrative purposes—returns differ by Class). The Average Annual Total Returns table shows how the Fund’s average annual total returns for various periods compare with those of the Russell 3000 Index, a broad-based measure of U.S. equity market performance, and the Russell Microcap Index and the Russell 2000 Index, indexes that reflect the performance of the particular market segment in which the Fund primarily invests. The Classes have substantially similar returns because they invest in the same portfolio of securities, differing only to the extent that the Service Class has higher expenses than the Investment Class. If Service Class’s expenses had been reflected, returns for that Class would have been lower.

Performance Information Illustrates Variability of Returns [Text]

The following performance information provides an indication of the risks of investing in the Fund.

Bar Chart Does Not Reflect Sales Loads [Text]

The Fund’s total returns do not reflect any deduction for charges or expenses of the variable contracts investing in the Fund. If these costs and expenses were reflected, the returns shown would be lower.

Bar Chart [Table]

Year	Returns
2016	19.7%
2017	5.2%
2018	-9.0%
2019	19.6%
2020	23.8%
2021	30.0%
2022	-22.4%
2023	18.8%
2024	13.7%
2025	13.9%

Highest Quarterly Return, Label [Optional Text]

highest return

Highest Quarterly Return, Date

Dec. 31, 2020

Lowest Quarterly Return

(31.90%)

Performance Table Heading

Average Annual Total Returns As of 12/31/25 (%)

Performance [Table]

	1 YEAR	5 YEAR	10 YEAR
Investment Class
Return Before Taxes	13.89	9.17	10.14
Service Class
Return Before Taxes	13.58	8.85	9.86
Russell 3000 Index
(Reflects no deductions for fees, expenses, or taxes)	17.15	13.15	14.29
Russell Microcap Index
(Reflects no deductions for fees, expenses, or taxes)	22.98	7.32	9.58
Russell 2000 Index
(Reflects no deductions for fees, expenses, or taxes)	12.81	6.09	9.62

Performance Availability Phone [Text]

(800) 841-1180

Prospectus [Line Items]

Performance Narrative [Text Block]

The following performance information provides an indication of the risks of investing in the Fund. Past performance does not indicate how the Fund will perform in the future. The Calendar Year Total Returns chart shows performance year-by-year over the last ten years (Investment Class used for illustrative purposes—returns differ by Class). The Average Annual Total Returns table shows how the Fund’s average annual total returns for various periods compare with those of the Russell 3000 Index, a broad-based measure of U.S. equity market performance, and the Russell 2000 Value Index and the Russell 2000 Index, indexes that reflect the performance of the particular market segment in which the Fund primarily invests. Each Class has substantially similar returns because they invest in the same portfolio of securities, differing only to the extent that the Service Class has higher expenses than the Investment Class. If Service Class’s expenses had been reflected, returns for that Class would have been lower.