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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Note Loans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	$ 93,725	$ 140,657
Mortgage loans related to buy-back option program	26,808,287		$ 26,663,713
Non-covered Loans held-in-portfolio	26,647,708		26,507,889
Reliable Financial Services
Accounts, Notes, Loans and Financing Receivable
Loans acquired				$ 1,802,463
Buy back option program
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	106,000		134,000
Mortgage loans related to buy-back option program	106,000		134,000
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Residential Mortgage Loans Sold	12,000	10,000
GNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	71,000	112,000
FNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	21,000	26,000
Consumer
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	69,000	51,000
Non-covered Loans held-in-portfolio	5,603,262		5,489,441
Mortgages
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	81,000	$ 156,000
Non-covered Loans held-in-portfolio	7,207,180		7,235,258
Mortgages \| US Government Agency Insured Loans
Accounts, Notes, Loans and Financing Receivable
Non-covered Loans held-in-portfolio	1,400,000		1,400,000
Mortgages \| US Government Agency Insured Loans \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Past Due	535,000		598,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Loans Sold	8,000
Commercial Loans \| Reliable Financial Services
Accounts, Notes, Loans and Financing Receivable
Loans acquired				341,000
Leasing
Accounts, Notes, Loans and Financing Receivable
Non-covered Loans held-in-portfolio	963,232		934,773
Reverse Mortgages
Accounts, Notes, Loans and Financing Receivable
Current	67,000		69,000
Residential mortgage loans insured By FHA
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	292,000		283,000
Auto Loan
Accounts, Notes, Loans and Financing Receivable
Non-covered Loans held-in-portfolio	2,742,095		2,608,785
Auto Loan \| Reliable Financial Services
Accounts, Notes, Loans and Financing Receivable
Loans acquired				$ 1,600,000
ASC Subtopic 310-30
Accounts, Notes, Loans and Financing Receivable
Outstanding principal balance of SOP loans	$ 2,100,000		$ 2,200,000