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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets $ 314,807 $ 376,131
Investment securities 6,191,571 4,531,786
Real estate loans held for sale 330,004 468,650
Other assets 112,704 123,568
Total assets 6,949,086 5,500,135
Trading account liabilities 216,366 249,797
Other liabilities 4,344 4,392
Total liabilities 220,710 254,189
U.S. Treasury and Federal Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 42,647 37,776
Obligations of States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 10,383 10,811
Government Issued or Guaranteed [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 5,801,091 4,165,086
Privately Issued Mortgage-Backed Securities [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 696 1,850
Collateralized Debt Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 61,768 63,083
Other Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 122,249 120,085
Equity Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 152,737 133,095
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 49,473 51,386
Investment securities 80,580 82,450
Real estate loans held for sale      
Other assets      
Total assets 130,053 133,836
Trading account liabilities      
Other liabilities      
Total liabilities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and Federal Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government Issued or Guaranteed [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Privately Issued Mortgage-Backed Securities [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized Debt Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 80,580 82,450
Significant Observable Inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 265,334 324,745
Investment securities 6,048,527 4,384,403
Real estate loans held for sale 330,004 468,650
Other assets 98,826 115,952
Total assets 6,742,691 5,293,750
Trading account liabilities 216,366 249,797
Other liabilities 3,055 717
Total liabilities 219,421 250,514
Significant Observable Inputs (Level 2) [Member] | U.S. Treasury and Federal Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 42,647 37,776
Significant Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 10,383 10,811
Significant Observable Inputs (Level 2) [Member] | Government Issued or Guaranteed [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 5,801,091 4,165,086
Significant Observable Inputs (Level 2) [Member] | Privately Issued Mortgage-Backed Securities [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Observable Inputs (Level 2) [Member] | Collateralized Debt Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 122,249 120,085
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 72,157 50,645
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets      
Investment securities 62,464 64,933
Real estate loans held for sale      
Other assets 13,878 7,616
Total assets 76,342 72,549
Trading account liabilities      
Other liabilities 1,289 3,675
Total liabilities 1,289 3,675
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Federal Agencies [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Unobservable Inputs (Level 3) [Member] | Government Issued or Guaranteed [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Unobservable Inputs (Level 3) [Member] | Privately Issued Mortgage-Backed Securities [Member] | Mortgage-backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 696 1,850
Significant Unobservable Inputs (Level 3) [Member] | Collateralized Debt Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 61,768 63,083
Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities      
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities