Loans Held For Investment And The Allowance For Credit Losses - Summary Of Amortized Cost By Origination Year Grouped By Risk Rating for Loans Held for Investment Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One	$ 224,160	$ 1,634,280
Amortized cost basis of loans by origination year, Two	1,647,659	173,871
Amortized cost basis of loans by origination year, Three	175,145	1,672,184
Amortized cost basis of loans by origination year, Four	1,639,580	856,873
Amortized cost basis of loans by origination year, Five	854,933	554,831
Amortized cost basis of loans by origination year, Prior	574,311	17,163
Amortized cost basis of loans by origination year, Total	5,115,788	4,909,202
Rating 2
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Total	543,401	527,051
Rating 3
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Total	3,360,840	3,726,753
Rating 4
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Total	1,188,547	632,398
Rating 5
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Total	23,000	23,000
Senior Loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One	224,160	1,634,280
Amortized cost basis of loans by origination year, Two	1,647,659	173,871
Amortized cost basis of loans by origination year, Three	175,145	1,637,224
Amortized cost basis of loans by origination year, Four	1,604,589	856,873
Amortized cost basis of loans by origination year, Five	854,933	554,831
Amortized cost basis of loans by origination year, Prior	574,311	17,163
Amortized cost basis of loans by origination year, Total	5,080,797	4,874,242
Senior Loans | Rating 2
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		33,621
Amortized cost basis of loans by origination year, Two	33,650
Amortized cost basis of loans by origination year, Three		82,461
Amortized cost basis of loans by origination year, Four	146,799	242,614
Amortized cost basis of loans by origination year, Five	189,702	168,355
Amortized cost basis of loans by origination year, Prior	173,250
Amortized cost basis of loans by origination year, Total	543,401	527,051
Senior Loans | Rating 3
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One	224,160	1,600,659
Amortized cost basis of loans by origination year, Two	1,614,009	95,858
Amortized cost basis of loans by origination year, Three	96,914	1,400,670
Amortized cost basis of loans by origination year, Four	960,458	407,509
Amortized cost basis of loans by origination year, Five	335,023	169,934
Amortized cost basis of loans by origination year, Prior	95,285	17,163
Amortized cost basis of loans by origination year, Total	3,325,849	3,691,793
Senior Loans | Rating 4
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Two		78,013
Amortized cost basis of loans by origination year, Three	78,231	154,093
Amortized cost basis of loans by origination year, Four	497,332	183,750
Amortized cost basis of loans by origination year, Five	307,208	216,542
Amortized cost basis of loans by origination year, Prior	305,776
Amortized cost basis of loans by origination year, Total	1,188,547	632,398
Senior Loans | Rating 5
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Four		23,000
Amortized cost basis of loans by origination year, Five	23,000
Amortized cost basis of loans by origination year, Total	23,000	23,000
Subordinated and Mezzanine Loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Three		34,960
Amortized cost basis of loans by origination year, Four	34,991
Amortized cost basis of loans by origination year, Total	34,991	34,960
Subordinated and Mezzanine Loans | Rating 3
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, Three		34,960
Amortized cost basis of loans by origination year, Four	34,991
Amortized cost basis of loans by origination year, Total	$ 34,991	$ 34,960