v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
C000017156 | Moog, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017156 | Hut 8 Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017156 | Viasat, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017156 | BrightSpring Health Services, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017156 | Cytokinetics, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | MaxLinear, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | Argan, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | UMB Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | JFrog Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | Riot Platforms, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017156 | SectorHealth Care  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
C000017156 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 18.00%
C000017156 | SectorIndustrials  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
C000017156 | SectorInformation Technology  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000017156 | SectorConsumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000017156 | SectorReal Estate  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000017156 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000017156 | SectorMaterials  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000017156 | SectorUtilities  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000017156 | SectorCommunication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000017156 | SectorConsumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000017156 | AssetCommon Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
C000017156 | AssetCash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017156 | AssetGovernment & Agency Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017156 | AssetRights  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017156 | AssetWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017156 | AssetOther Investments  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017156 | Asset Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | Moog, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017157 | Hut 8 Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017157 | Viasat, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017157 | BrightSpring Health Services, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
C000017157 | Cytokinetics, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | MaxLinear, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | Argan, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | UMB Financial Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | JFrog Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | Riot Platforms, Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.30%
C000017157 | SectorHealth Care  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
C000017157 | SectorFinancials  
Holdings [Line Items]  
Percent of Net Asset Value 18.00%
C000017157 | SectorIndustrials  
Holdings [Line Items]  
Percent of Net Asset Value 15.00%
C000017157 | SectorInformation Technology  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000017157 | SectorConsumer Discretionary  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000017157 | SectorReal Estate  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000017157 | SectorEnergy  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000017157 | SectorMaterials  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000017157 | SectorUtilities  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000017157 | SectorCommunication Services  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000017157 | SectorConsumer Staples  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000017157 | AssetCommon Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
C000017157 | AssetCash Equivalents  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | AssetGovernment & Agency Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | AssetRights  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | AssetWarrants  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | AssetOther Investments  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000017157 | Asset Other Net Line  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%