Fair Value - Narrative (Details) $ in Thousands	Jun. 30, 2023 USD ($) loan	May 16, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of loans | loan	4
Loans held-for-investment	$ 3,096,500			$ 3,350,150
Loans held-for-investment, net of allowance for credit losses	$ 2,966,088		$ 3,182,379	$ 3,267,815	$ 3,830,014	$ 3,750,470	$ 3,741,308
Office, Phoenix, AZ | Commercial Mortgage Loan | Unlikely to be Collected Financing Receivable | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment, net of allowance for credit losses		$ 24,000
Minimum | Exit Capitalization Rate | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0675
Minimum | Measurement Input, Discount Rate | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0925
Minimum | Measurement Input, Return on Cost Assumption | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0550
Maximum | Exit Capitalization Rate | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0725
Maximum | Measurement Input, Discount Rate | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0975
Maximum | Measurement Input, Return on Cost Assumption | Senior Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0600
Loan One | Minimum | Exit Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0700
Loan One | Minimum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0800
Loan One | Minimum | Measurement Input, Return on Cost Assumption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0575
Loan One | Maximum | Exit Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0950
Loan One | Maximum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.1100
Loan One | Maximum | Measurement Input, Return on Cost Assumption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, measurement input	0.0625
Loan One | Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment	$ 245,600
Loans held-for-investment, net of allowance for credit losses	$ 183,300