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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended 48 Months Ended
Mar. 31, 2019
USD ($)
lease
Jul. 15, 2010
plaintiff
Mar. 31, 2019
USD ($)
loan
lease
repurchase_request
certificate
Dec. 31, 2018
USD ($)
partnership
Mar. 31, 2018
USD ($)
loan
repurchase_request
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]                    
Lessee, number of leases | lease 5   5              
Number of noncancelable leases | lease 4   4              
Present value of remaining lease payments $ 16,446   $ 16,446              
Operating lease expense     $ 1,000   $ 1,000          
Number of leases qualified as short-term lease | lease     1              
Lease liability 13,188   $ 13,188 $ 0            
Right-of-use asset $ 11,681   $ 11,681 $ 0            
Number of leases without implicit interest rate | lease     4              
Weighted average remaining lease term 8 years   8 years              
Discount rate 5.30%   5.30%              
Number of partnerships, committed to fund | partnership       2            
Commitment to fund partnership, funded amount $ 19,000   $ 19,000              
Commitment to fund partnership     66,000              
Contingent consideration 24,621   24,621 $ 0            
Loan principal 400   400              
Guarantee obligations 16,359   16,359 16,711            
Guarantee obligations, credit reserve 5,000   5,000              
Special Purpose Entities (SPEs) assets 48,000   48,000 47,000            
Special Purpose Entities (SPEs) liabilities 16,000   16,000 17,000            
Residential repurchase reserve 4,328   $ 4,328 4,189            
Number of residential repurchase requests (in repurchase requests) | repurchase_request     4   2          
Number of loans repurchased | loan     0   0          
Residential repurchase provisions recorded     $ 100   $ 300          
Aggregate amount of loss contingency reserves 2,000   $ 2,000 2,000            
Morgan Stanley And Company                    
Loss Contingencies [Line Items]                    
Number of mortgage pass-through certificates issued (in certificates) | certificate     28              
Sequoia Residential Funding                    
Loss Contingencies [Line Items]                    
Number of mortgage pass-through certificates issued (in certificates) | certificate           2 2 4    
Number of certificated withdrawn | certificate             1 8    
Schwab                    
Loss Contingencies [Line Items]                    
Number of other named defendants along with SRF (in plaintiffs) | plaintiff   26                
Residential Loans                    
Loss Contingencies [Line Items]                    
Loan principal 802,000   $ 802,000 $ 1,030,000            
Loans held-for-investment, in foreclosure 1,000   1,000              
Other income                    
Loss Contingencies [Line Items]                    
Other income related to risk sharing agreement     1,000   1,000          
Mortgage banking and investment activities                    
Loss Contingencies [Line Items]                    
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015)     (100)   $ (100)          
Guarantee Obligations                    
Loss Contingencies [Line Items]                    
Original unpaid balance of loans subject to risk sharing agreements                 $ 3,190,000 $ 3,190,000
Potential future payments on loans 44,000   44,000              
Loan principal $ 1,800,000   $ 1,800,000              
Weighted average original Fair Isaac Corporation (FICO) score 759   759              
Weighted average original loan-to-value (LTV) 76.00%   76.00%              
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                    
Loss Contingencies [Line Items]                    
Balance of loans 90 days or more delinquent $ 6,000   $ 6,000              
Residential | Sequoia | FHLB Seattle                    
Loss Contingencies [Line Items]                    
Principal value 133,000   133,000              
Debt instrument principal payment amount     126,000              
Debt instrument interest payment amount     12,000              
Residential | Sequoia | Schwab                    
Loss Contingencies [Line Items]                    
Principal value 15,000   15,000              
Principal balance of securities 14,000   14,000              
Debt instrument interest amount 1,000   1,000              
ASU 2016-02                    
Loss Contingencies [Line Items]                    
Lease liability 13,000   13,000              
Right-of-use asset 12,000   12,000              
Financial Guarantee                    
Loss Contingencies [Line Items]                    
Commitment to fund partnership 56,000                  
Guarantor obligations, current carrying value 100   100              
Guarantor obligations, maximum exposure, undiscounted 135,000   135,000              
Commitment To Fund Residential Bridge Loan                    
Loss Contingencies [Line Items]                    
Commitments to fund temporary advances 4,000   4,000              
Commitment To Fund Temporary Advances On Residential Bridge Loans                    
Loss Contingencies [Line Items]                    
Commitments to fund temporary advances $ 82,000   $ 82,000