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Loans and Investments - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in allowance for loan losses    
Allowance at beginning of period $ 148,329 $ 71,069
Provision for credit losses (net of recoveries) (24,315) 59,966
Charge-offs (24,315) (75)
Allowance at end of period 113,241 148,329
Unfunded commitments related to structured loans and investments 975,200  
As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 148,329  
Allowance at end of period   148,329
Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   17,294
Impact of adopting CECL | Impact of Adoption    
Changes in allowance for loan losses    
Charge-offs (10,773)  
Land    
Changes in allowance for loan losses    
Allowance at beginning of period 78,150 67,869
Provision for credit losses (net of recoveries) (180) 10,204
Allowance at end of period 77,970 78,150
Land | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 78,150  
Allowance at end of period   78,150
Land | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   77
Multifamily Portfolio    
Changes in allowance for loan losses    
Allowance at beginning of period 36,468  
Provision for credit losses (net of recoveries) (17,761) 20,146
Allowance at end of period 18,707 36,468
Multifamily Portfolio | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 36,468  
Allowance at end of period   36,468
Multifamily Portfolio | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   16,322
Retail    
Changes in allowance for loan losses    
Allowance at beginning of period 13,861  
Provision for credit losses (net of recoveries) (42) 13,526
Allowance at end of period 5,819 13,861
Retail | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 13,861  
Allowance at end of period   13,861
Retail | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   335
Retail | Impact of adopting CECL | Impact of Adoption    
Changes in allowance for loan losses    
Charge-offs (8,000)  
Office    
Changes in allowance for loan losses    
Allowance at beginning of period 1,846 1,500
Provision for credit losses (net of recoveries) 6,227 59
Allowance at end of period 8,073 1,846
Office | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 1,846  
Allowance at end of period   1,846
Office | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   287
Healthcare    
Changes in allowance for loan losses    
Allowance at beginning of period 3,880  
Provision for credit losses (net of recoveries) (1,099) 3,816
Allowance at end of period 8 3,880
Healthcare | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 3,880  
Allowance at end of period   3,880
Healthcare | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   64
Healthcare | Impact of adopting CECL | Impact of Adoption    
Changes in allowance for loan losses    
Charge-offs (2,773)  
Student Housing    
Changes in allowance for loan losses    
Allowance at beginning of period 4,078  
Provision for credit losses (net of recoveries) (3,442) 4,010
Allowance at end of period 636 4,078
Student Housing | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 4,078  
Allowance at end of period   4,078
Student Housing | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   68
Hotel Portfolio    
Changes in allowance for loan losses    
Allowance at beginning of period 7,759  
Provision for credit losses (net of recoveries) (7,751) 7,730
Allowance at end of period 8 7,759
Hotel Portfolio | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 7,759  
Allowance at end of period   7,759
Hotel Portfolio | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   29
Other Property    
Changes in allowance for loan losses    
Allowance at beginning of period 2,287 1,700
Provision for credit losses (net of recoveries) (267) 475
Allowance at end of period 2,020 2,287
Other Property | As Reported Pre-Adoption    
Changes in allowance for loan losses    
Allowance at beginning of period 2,287  
Allowance at end of period   2,287
Other Property | Impact of adopting CECL    
Changes in allowance for loan losses    
Allowance at beginning of period   112
Bridge Loans | Hotel Portfolio    
Changes in allowance for loan losses    
Allowance at beginning of period $ 7,500  
Allowance at end of period   $ 7,500