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Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 5,970,115 | $ 5,385,091
Percentage of adjusted specific issuer evaluation defaults | 100.00% |
Pooled trust preferred securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
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 | $ 7,913 | $ 8,222
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 | 0.000 | 0.000
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 | 0.062
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 | 0.080
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 | 0.232 | 0.191
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 | 0.068 | 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 | 0.073 | 0.060
Significant Unobservable Inputs (Level 3) | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 40
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 10,747 | $ 10,361
Number of loans | loan |  | 1
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 | $ 40,653 | $ 11,610
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | 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 |  | 0.45
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 | 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 |
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 | 0.33 | 0.50
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 | 0.18 |
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 | 0.12 | 0.13
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 | 0.07 |
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Commercial real estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 21
Number of loans | loan |  | 1
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 |  | $ 22
Number of loans | loan |  | 1
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | 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 |  | 0.43
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | 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 |  | 0.21

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