Load [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|||
| Bloomberg Municipal Taxable Bond Index (Index reflects no deduction for fees, expenses, or taxes) | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 7.89% | (0.28%) | 3.25% | ||
| Taxable Municipal Bond Series | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.37% | (2.72%) | 0.97% | ||
| Taxable Municipal Bond Series | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 4.42% | (4.30%) | (0.88%) | ||
| Taxable Municipal Bond Series | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 3.74% | (2.69%) | (0.01%) | |
| |||||