v3.25.2
S000000549 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 131 Months Ended 334 Months Ended 388 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
S&P Municipal Bond Index (reflects no deduction for fees, expenses or taxes)            
Prospectus [Line Items]            
Average Annual Return, Percent [1],[2] 1.90% 1.20% 2.34%      
S&P Municipal Bond New Mexico Index (reflects no deduction for fees, expenses or taxes)            
Prospectus [Line Items]            
Average Annual Return, Percent [3] 2.02% 1.06% 1.92%      
Lipper Other States Municipal Debt Funds Classification Average (reflects no deduction for taxes or sales loads)            
Prospectus [Line Items]            
Average Annual Return, Percent [4],[5] 1.55% 0.43% 1.54%      
Class A            
Prospectus [Line Items]            
Average Annual Return, Percent (2.34%) 0.00% 1.53%      
Performance Inception Date           Sep. 16, 1992
Class A | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent (2.34%) 0.00% 1.53%      
Performance Inception Date           Sep. 16, 1992
Class A | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent (0.16%) 0.59% 1.81%      
Performance Inception Date           Sep. 16, 1992
Class C            
Prospectus [Line Items]            
Average Annual Return, Percent 1.06% 0.04% 1.30%      
Performance Inception Date       Feb. 10, 2014    
Class I            
Prospectus [Line Items]            
Average Annual Return, Percent 2.06% 1.05% 2.15%      
Performance Inception Date         Feb. 24, 1997  
[1]
An index designed to measure the performance of the tax-exempt U.S. municipal bond market.
[2] An index designed to measure the performance of the tax-exempt U.S. municipal bond market.
[3] An index designed to measure the performance of the tax-exempt New Mexico municipal bond market.
[4]
Represents the average annualized total return for all reporting funds in the Lipper Other States Municipal Debt Funds Classification.
[5] Represents the average annualized total return for all reporting funds in the Lipper Other States Municipal Debt Funds Classification.