v3.26.3
Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Schedule of Classification and Carrying Value of Unconsolidated VIEs (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Maximum exposure    
Variable Interest Entity [Line Items]    
Investments $ 75,591 $ 103,663
Maximum exposure | Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Variable Interest Entity [Line Items]    
Investments 18,797 21,476
Maximum exposure | Balance Sheet Location [Axis]: us-gaap:EquityMethodInvestments    
Variable Interest Entity [Line Items]    
Investments 17,926 24,711
Maximum exposure | Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Variable Interest Entity [Line Items]    
Investments 2,000 2,000
Maximum exposure | Balance Sheet Location [Axis]: adam:FinancialInstrumentOwnedLoansAndPreferredEquityNet    
Variable Interest Entity [Line Items]    
Investments 36,868 55,476
Non-Agency RMBS    
Variable Interest Entity [Line Items]    
Investments 18,797 21,476
Non-Agency RMBS | Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Variable Interest Entity [Line Items]    
Investments 18,797 21,476
Non-Agency RMBS | Balance Sheet Location [Axis]: us-gaap:EquityMethodInvestments    
Variable Interest Entity [Line Items]    
Investments 0 0
Non-Agency RMBS | Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Variable Interest Entity [Line Items]    
Investments 0 0
Non-Agency RMBS | Balance Sheet Location [Axis]: adam:FinancialInstrumentOwnedLoansAndPreferredEquityNet    
Variable Interest Entity [Line Items]    
Investments 0 0
Preferred equity investments in multi-family properties    
Variable Interest Entity [Line Items]    
Investments 54,794 80,187
Preferred equity investments in multi-family properties | Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Variable Interest Entity [Line Items]    
Investments 0 0
Preferred equity investments in multi-family properties | Balance Sheet Location [Axis]: us-gaap:EquityMethodInvestments    
Variable Interest Entity [Line Items]    
Investments 17,926 24,711
Preferred equity investments in multi-family properties | Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Variable Interest Entity [Line Items]    
Investments 0 0
Preferred equity investments in multi-family properties | Balance Sheet Location [Axis]: adam:FinancialInstrumentOwnedLoansAndPreferredEquityNet    
Variable Interest Entity [Line Items]    
Investments 36,868 55,476
Other investments    
Variable Interest Entity [Line Items]    
Investments 2,000 2,000
Other investments | Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Variable Interest Entity [Line Items]    
Investments 0 0
Other investments | Balance Sheet Location [Axis]: us-gaap:EquityMethodInvestments    
Variable Interest Entity [Line Items]    
Investments 0 0
Other investments | Balance Sheet Location [Axis]: us-gaap:OtherAssets    
Variable Interest Entity [Line Items]    
Investments 2,000 2,000
Other investments | Balance Sheet Location [Axis]: adam:FinancialInstrumentOwnedLoansAndPreferredEquityNet    
Variable Interest Entity [Line Items]    
Investments $ 0 $ 0