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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock $ 161,145 $ 204,255
Loans held for sale 701,398 367,221
Mortgage servicing rights 197,195 247,734
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 161,145 204,255
Loans held for sale 701,398 367,221
Mortgage servicing rights 191,419 243,389
Interest rate lock commitments 6,934 2,526
Derivative assets-other 4,669 [1] 2,193 [2]
Derivative liabilities (213) (336)
Fair Value, Measurements, Recurring | Mortgage-Related Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 7,827 53,852
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 7,827 53,852
Fair Value, Measurements, Recurring | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 153,318 150,403
Fair Value, Measurements, Recurring | Other Securities | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 799 795
Fair Value, Measurements, Recurring | Other Securities | Capital trust notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 6,976 6,964
Fair Value, Measurements, Recurring | Other Securities | Preferred stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 127,979 125,372
Fair Value, Measurements, Recurring | Other Securities | Mutual Funds and Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 17,564 17,272
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 98,874 96,641
Derivative assets-other 4,591 [1] 1,875 [2]
Derivative liabilities (424) (1,539)
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 98,874 96,641
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities | Preferred stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 98,874 96,641
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 62,271 107,614
Loans held for sale 701,398 367,221
Derivative assets-other 2,942 [1] 1,342 [2]
Derivative liabilities (5,175) (2,783)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 7,827 53,852
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities | GSE certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 7,827 53,852
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 54,444 53,762
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Municipal bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 799 795
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Capital trust notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 6,976 6,964
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Preferred stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 29,105 28,731
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Mutual Funds and Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual funds and common stock 17,564 17,272
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights 191,419 243,389
Interest rate lock commitments 6,934 2,526
Fair Value, Measurements, Recurring | Netting Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets-other [3] (2,864) [1] (1,024) [2]
Derivative liabilities [3] $ 5,386 $ 3,986
[1] Includes $2.7 million to purchase Treasury options.
[2] Includes $1.9 million to purchase Treasury options.
[3] Includes cash collateral received from, and paid to, counterparties.