Note Loans (Loans in non-performing status and accruing loans past-due 90 days or more by loan class) (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2017		Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held-in-portfolio, net of unearned income	$ 22,734,721	[1],[2]	$ 22,773,747	[3],[4]
ASC Subtopic 310-30
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held-in-portfolio, net of unearned income	194,000		215,000
Reverse Mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past-due 90 days or more	59,000		68,000
Residential mortgage loans insured By FHA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past-due 90 days or more	$ 173,000		$ 181,000

[1] Includes $7.3 billion pledged to secure credit facilities and public funds that the secured parties are not permitted to sell or repledge the collateral, of which $4.5 billion were pledged at the Federal Home Loan Bank("FHLB") as collateral for borrowings, $2.3 billion at the Federal Reserve Bank ("FRB") for discount window borrowings and $0.5 billion serve as collateral for public funds.

[2] Non-covered loans held-in-portfolio are net of $124 million in unearned income and exclude $85 million in loans held-for-sale.

[3] Includes $7.3 billion pledged to secure credit facilities and public funds that the secured parties are not permitted to sell or repledge the collateral, of which $4.5 billion were pledged at the FHLB as collateral for borrowings, $2.3 billion at the FRB for discount window borrowings and $0.5 billion serve as collateral for public funds.

[4] Non-covered loans held-in-portfolio are net of $121 million in unearned income and exclude $89 million in loans held-for-sale.