S000016937 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Russell 3000 Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.15% | 13.15% | 14.29% |
| Russell Midcap Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 10.60% | 8.67% | 11.01% |
| Class I | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 4.35% | 4.50% | 7.50% |
| Class II | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 4.08% | 4.23% | 7.24% |