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Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 7,027,950 | $ 5,970,115
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 | 100.00% |
Percentage of adjusted specific issuer evaluation recoveries | 100.00% |
Pooled trust preferred securities | Median |  |
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 | $ 9,367 | $ 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 | 0.057 | 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 | 0.113 | 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 | 0.235 | 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 | 0.075 | 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 | 0.076 | 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 | $ 12,586 | $ 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 | $ 14,957 | $ 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 | 0.01 | 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 | 0.10 | 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 | 0.26 | 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 | 0.19 | 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 | 0.11 | 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 | 0.16 | 0.07

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