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S000000699 [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 Bond Index (reflects no deduction for expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 4.25% 0.80% 2.34%
Bloomberg Municipal Bond 5 Year (4-6) Index (reflects no deduction for expenses or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 5.03% 1.05% 1.93%
Clearwater Tax-Exempt Bond Fund      
Prospectus [Line Items]      
Average Annual Return, Percent 5.00% 1.57% 3.19%
Clearwater Tax-Exempt Bond Fund | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 5.00% 1.51% 3.10%
Clearwater Tax-Exempt Bond Fund | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 4.83% 2.09% 3.39%
[1]
In calculating the U.S. federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemption are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the returns after taxes on distributions and sale of Fund shares to be greater than the returns after taxes on distributions or even the returns before taxes.