Service Shares [Member] Average Annual Total Returns - Service Shares |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Bloomberg Municipal Bond Index (Reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 4.25% | 0.80% | 2.34% |
| Service Shares | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 2.99% | 0.27% | 1.78% |
| Service Shares | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 2.99% | 0.24% | 1.76% |
| Service Shares | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 3.23% | 0.81% | 1.98% |