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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration of Credit Risk    
Loans Receivable $ 2,506,743 $ 2,913,260
Deferred Tax Assets, Mark-to-Market Adjustments on Mortgage Loans Held for Sale 41 9
Residential real estate    
Concentration of Credit Risk    
Loans Receivable $ 2,033,526 $ 2,476,866
Loans receivables | Residential real estate    
Concentration of Credit Risk    
Concentration of credit risk 81.00% 85.00%
California | Loans receivables    
Concentration of Credit Risk    
Concentration of credit risk 87.00% 89.00%
Advantage loan program | Loans receivables | Residential real estate    
Concentration of Credit Risk    
Concentration of credit risk 74.00% 78.00%
Loans Receivable $ 1,515,248 $ 1,942,657
Mortgage loans held for sale $ 19,375