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Commitments and Contingencies - Additional Information (Detail) $ in Thousands		3 Months Ended
	Jul. 15, 2010 Plaintiff	Mar. 31, 2016 USD ($) lease repurchase_request	Mar. 31, 2015 USD ($) repurchase_request	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Number of noncancelable leases | lease		7
Operating lease expiration dates		2021
Future lease commitments with expiration date		$ 9,539
Operating lease expense		1,000	$ 1,000
Special Purpose Entities (SPEs) assets		66,000		$ 63,000
Special Purpose Entities (SPEs) liabilities		25,000		25,000
Residential repurchase reserve		$ 6,693		6,403
Residential repurchase requests | repurchase_request		27	25
Residential repurchase provisions recorded		$ 300	$ 1,000
Aggregate amount of loss contingency reserves		2,000		$ 2,000
Schwab
Loss Contingencies [Line Items]
Number of other named defendants along with SRF | Plaintiff	26
Guarantee Obligations
Loss Contingencies [Line Items]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement, Original Principal Balance		3,190,000
Loan Principal		$ 2,930,000
Weighted average original Fair Isaac Corporation (FICO) score		758
Weighted average original loan-to-value (LTV)		76.00%
Potential future payments on loans		$ 44,000
Guarantee Obligations | Financing Receivables, Equal To Greater Than 30 Days Past Due
Loss Contingencies [Line Items]
Financing Receivable, Recorded Investment, Past Due		11,000
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due
Loss Contingencies [Line Items]
Financing Receivable, Recorded Investment, Past Due		$ 1,000
Residential | Sequoia | FHLB Seattle
Loss Contingencies [Line Items]
Statutory interest rate per annum		8.00%
Principal value		$ 133,000
Debt instrument principal payment amount		121,000
Debt instrument interest payment amount		11,000
Residential | Sequoia | Schwab
Loss Contingencies [Line Items]
Principal value		15,000
Principal balance of securities		13,000
Debt instrument interest amount		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)		$ 0	$ (1,000)

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