Shareholder Report, Holdings (Details)	Jun. 30, 2026
C000024828 \| Asset-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000024828 \| Non-Agency Mortgage-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000024828 \| Commercial Mortgage-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000024828 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000024828 \| Collateralized Mortgage Obligations
Holdings [Line Items]
Percent of Net Asset Value	15.60%
C000024828 \| Mortgage-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	95.70%
C000024830 \| Independent Energy
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000024830 \| Automotive
Holdings [Line Items]
Percent of Net Asset Value	3.70%
C000024830 \| Gaming
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000024830 \| Building Materials
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000024830 \| Chemicals
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000024830 \| Cable Satellite
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000024830 \| Health Care
Holdings [Line Items]
Percent of Net Asset Value	5.00%
C000024830 \| Midstream
Holdings [Line Items]
Percent of Net Asset Value	5.80%
C000024830 \| Insurance - P&C
Holdings [Line Items]
Percent of Net Asset Value	8.90%
C000024830 \| Technology
Holdings [Line Items]
Percent of Net Asset Value	16.80%