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Loans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable
Commercial Construction Loans Sold	$ 25,000		$ 33,000
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	120,541	$ 119,962	214,266	$ 260,619
Mortgage loans related to buy-back option program	27,171,467		27,171,467		$ 26,663,713
Non-covered Loans held-in-portfolio	27,005,745		27,005,745		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	96,000		96,000
Mortgage loans related to buy-back option program	96,000		96,000		134,000
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Residential Mortgage Loans Sold	15,000	16,000		26,000
Residential Mortgage \| Reliable Financial Services
Accounts, Notes, Loans and Financing Receivable
Residential Mortgage Loans Sold			28,000
GNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	88,000	97,000	159,000	210,000
FNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	31,000	20,000	52,000	46,000
Consumer
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	89,000	53,000	158,000	105,000
Non-covered Loans held-in-portfolio	5,749,325		5,749,325		5,489,441
Mortgages
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	104,000	$ 177,000	185,000	$ 333,000
Non-covered Loans held-in-portfolio	7,198,959		7,198,959		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		1,400,000
Mortgages \| US Government Agency Insured Loans \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Past Due	479,000		479,000		598,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	29,000		43,000
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	991,546		991,546		934,773
Reverse Mortgages
Accounts, Notes, Loans and Financing Receivable
Current	66,000		66,000		69,000
Residential mortgage loans insured By FHA
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	262,000		262,000		283,000
Auto Loan
Accounts, Notes, Loans and Financing Receivable
Non-covered Loans held-in-portfolio	2,796,403		2,796,403		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		$ 2,100,000		$ 2,200,000