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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities $ 3,959,783 $ 4,822,606
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 49,544 50,060
Significant Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading account assets 663,014 1,018,521
Trading account liabilities 101,271 116,902
U.S. Treasury and Federal Agencies [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 7,023 9,338
Government Issued or Guaranteed [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 3,820,490 4,683,438
Other Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 132,270 129,814
Fair Value Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading account assets 712,558 1,068,581
Investment securities 3,959,783 4,822,606
Equity securities 78,671 92,985
Real estate loans held for sale 884,355 1,054,676
Other assets 47,882 49,464
Total assets 5,683,249 7,088,312
Trading account liabilities 101,271 116,902
Other liabilities 13,759 23,583
Total liabilities 115,030 140,485
Fair Value Measurements, Recurring [Member] | 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 49,544 50,060
Equity securities 71,917 63,129
Total assets 121,461 113,189
Fair Value Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading account assets 663,014 1,018,521
Investment securities 3,959,783 4,822,590
Equity securities 6,754 29,856
Real estate loans held for sale 884,355 1,054,676
Other assets 8,620 5,865
Total assets 5,522,526 6,931,508
Trading account liabilities 101,271 116,902
Other liabilities 10,163 23,218
Total liabilities 111,434 140,120
Fair Value Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities   16
Other assets 39,262 43,599
Total assets 39,262 43,615
Other liabilities 3,596 365
Total liabilities 3,596 365
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 7,023 9,338
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 7,023 9,338
Fair Value Measurements, Recurring [Member] | Government Issued or Guaranteed [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 3,820,490 4,683,438
Fair Value Measurements, Recurring [Member] | Government Issued or Guaranteed [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 3,820,490 4,683,438
Fair Value Measurements, Recurring [Member] | Privately Issued Mortgage-Backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities   16
Fair Value Measurements, Recurring [Member] | Privately Issued Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities   16
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities 132,270 129,814
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities $ 132,270 $ 129,814