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Related Party Transactions - Investments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]      
Servicing income $ 26,198,000 $ 30,198,000 $ 16,373,000
Carrying value, at year-end, of held-to-maturity securities purchased from debt funds 293,268,000 1,252,793,000  
Limited Liability Company, Senior Housing and Healthcare Sectors | Equity Method Investment, Nonconsolidated Investee, Other [Member]      
Related Party Transaction [Line Items]      
Origination fees received from borrowers referred by the LLC 12,669,000 24,830,000 17,848,000
Fees paid to LLC for loans referred and originated (9,866,000) (17,145,000) (14,512,000)
Servicing income 561,000 417,000 69,000
Servicing income participation paid to LLC (281,000) (209,000) (34,000)
Income from investment in LLC 1,612,000 4,129,000 1,369,000
Distributions received from LLC and debt funds 993,000 3,795,000 405,000
Interest income paid to LLC for loans originated and referred by the LLC (3,587,000) (6,725,000) (4,522,000)
Low Income Housing Tax Credit Syndication Business      
Related Party Transaction [Line Items]      
Gains (losses) recognized on loans sold to debt funds 0 0 0
Low Income Housing Tax Credit Syndication Business | Capital Investment      
Related Party Transaction [Line Items]      
Interest income, financing (1) and other fees received from syndicated funds 16,592,000 11,012,000 8,030,000
Loans outstanding, net of participations sold, to syndicated and debt funds 127,449,000 49,004,000 18,586,000
Single Family and Multi-Family Debt Financing Investments | Capital Investment      
Related Party Transaction [Line Items]      
Distributions received from LLC and debt funds 890,000 512,000  
Loans outstanding, net of participations sold, to syndicated and debt funds 108,055,000 35,732,000 20,700,000
Income from investments, servicing, interest income, and management of debt funds 29,992,000 4,642,000 1,139,000
Loans sold to debt funds 102,336,000 884,247,000 $ 273,914,000
Gains (losses) recognized on loans sold to debt funds (263,000)    
Carrying value, at year-end, of held-to-maturity securities purchased from debt funds $ 472,539,000 $ 248,366,000