S000025873 [Member] Average Annual Total Returns	12 Months Ended	60 Months Ended	120 Months Ended
S000025873 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Bloomberg U.S. Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	4.25%	0.80%	2.34%
ICE BofA 6-12 Month Municipal Securities Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	3.18%	1.87%	1.56%
ICE BofA 1-3 Year US Municipal Securities Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	3.72%	1.56%	1.59%
75% ICE BofA 6-12 Month Municipal Securities Index and 25% ICE BofA 1-3 Year US Municipal Securities Index (reflects no deduction for fees, expenses, or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	3.20%	2.03%	1.58%
TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND
Prospectus [Line Items]
Average Annual Return, Percent	3.48%	2.18%	1.79%
TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	3.18%	1.87%	1.56%
TAX-ADVANTAGED ULTRA-SHORT FIXED INCOME FUND \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	3.06%	1.88%	1.54%