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Boston Trust Midcap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Boston Trust Midcap Fund
Objective [Heading] rr_ObjectiveHeading Investment Goals
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Boston Trust Midcap Fund seeks long-term capital growth through an actively managed portfolio of stocks of middle capitalization (“mid cap”) companies.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Boston Trust Midcap Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the fiscal year ended December 31, 2018, the Fund’s portfolio turnover rate was 19.34% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 19.34%
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes a $10,000 investment, a 5% annual return, redemption at the end of each period and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, at least 80% of its assets in a diversified portfolio of domestic equity securities of mid cap companies. Equity securities include common stock and any rights to purchase common stock. “Assets” means net assets, plus the amount of borrowings for investment purposes. Shareholders will be given 60 days’ advance notice of any change to this policy. For these purposes, the Adviser defines mid cap companies as those with market capitalizations within the range encompassed by the Russell Midcap® Index at the time of purchase. The size of companies in the Russell Midcap® Index may change with market conditions. In addition, changes to the composition of the Russell Midcap® Index can change the market capitalization range of the companies included in the index. As of December 31, 2018, the market capitalization range of the Russell Midcap® Index was between $242 million and $37.5 billion. However, the Fund generally excludes securities with market capitalization less than $2 billion at time of purchase.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry a certain amount of risk and the Fund cannot guarantee that it will achieve its investment objective. The value of the Fund’s investments will fluctuate with market conditions and interest rates and the value of your investment in the Fund will also vary. You could lose money on your investment in the Fund, or the Fund could underperform other investments. Investments in the Fund are not deposits of the Adviser or Boston Trust & Investment Management Company and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Below are the main risks of investing in the Fund.


Market Risk: Market risk refers to the risk related to investments in securities in general and the daily fluctuations in the securities markets.


Equity Risk: The value of the equity securities held by the Fund, and thus the value of the Fund’s shares, can fluctuate — at times dramatically.


Mid Cap Company Risk: These companies may be subject to greater market risks and fluctuations in value than large capitalization companies and may not correspond to changes in the stock market in general.


Management Risk: The Adviser’s judgments about the attractiveness, value and potential appreciation of a particular asset class or individual security in which the Fund invests may prove to be incorrect and there is no guarantee that the Adviser’s judgment will produce the desired results.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on your investment in the Fund, or the Fund could underperform other investments.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Investments in the Fund are not deposits of the Adviser or Boston Trust & Investment Management Company and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns over time compare with those of a broad measure of market performance. The Fund’s past performance is not an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.btim.com or by calling 1-800-282-8782, extension 7050.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns over time compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-282-8782, extension 7050
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.btim.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance is not an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Average Total Returns (Years ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter:

 

Worst quarter:

2Q2009

 

3Q2011

18.26%

 

(17.41)%

For the period January 1, 2019 through March 31, 2019, the aggregate (non-annualized) total return for the Fund was 13.82%.

Year to Date Return, Label rr_YearToDateReturnLabel total return for the Fund
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.82%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.26%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.41%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on a shareholder’s tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRA”).
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRA”).
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of December 31, 2018)
Boston Trust Midcap Fund | Russell Midcap® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.06%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.26%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.03%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.89%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 24, 2007
Boston Trust Midcap Fund | Boston Trust Midcap Fund  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 312
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 542
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,201
Annual Return 2009 rr_AnnualReturn2009 33.34%
Annual Return 2010 rr_AnnualReturn2010 31.43%
Annual Return 2011 rr_AnnualReturn2011 0.71%
Annual Return 2012 rr_AnnualReturn2012 10.46%
Annual Return 2013 rr_AnnualReturn2013 28.91%
Annual Return 2014 rr_AnnualReturn2014 11.61%
Annual Return 2015 rr_AnnualReturn2015 (0.26%)
Annual Return 2016 rr_AnnualReturn2016 12.13%
Annual Return 2017 rr_AnnualReturn2017 20.01%
Annual Return 2018 rr_AnnualReturn2018 (3.36%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.36%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.79%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.29%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 24, 2007
Boston Trust Midcap Fund | Boston Trust Midcap Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.60%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.19%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.77%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.40%
Boston Trust Midcap Fund | Boston Trust Midcap Fund | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.03%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.92%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.54%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.74%