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Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 6,724,530 $ 5,970,115
Pooled trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation defaults 100.00%  
Percentage of adjusted specific issuer evaluation recoveries 100.00%  
Pooled trust preferred securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation defaults 0.00%  
Percentage of adjusted specific issuer evaluation recoveries 0.00%  
Pooled trust preferred securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation defaults 50.00%  
Percentage of adjusted specific issuer evaluation recoveries 25.00%  
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 8,210 $ 7,913
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Constant Prepayment Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.0000 0.0000
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.060 0.060
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.000 0.000
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.087 0.087
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.233 0.232
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.069 0.068
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.074 0.073
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 12,484 $ 10,747
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 18,983 $ 40,653
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Minimum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.02 0
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Minimum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.04 0
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Maximum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.27 0.33
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Maximum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.20 0.18
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Weighted Average | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.10 0.12
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Weighted Average | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.12 0.07
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 15  
Number of loans | loan 1  
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Minimum | Discount for Type of Property, Age of Appraisal, and Current Status | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.60