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Multifamily Loans - Geographic Concentration of Multifamily Loans (Details) - Multifamily securities - Geographic Concentration Risk - Loan Benchmark	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	13.00%
Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	13.00%
North Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	9.00%	9.00%
Oregon
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	7.00%
Hawaii
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	5.00%
Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	5.00%
Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	48.00%	48.00%

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