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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, 2022 USD ($) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investment securities - available-for-sale | $ 6,862,980 | $ 7,382,066
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] |  |
Total investment securities - available-for-sale |  | $ 9,496
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
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
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
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 |  | 0.085
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 |  | 0.460
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 |  | 0.065
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 |  | 0.141
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 29,500 | $ 2,634
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 | $ 44,401 | $ 16,308
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 | 0.04 | 0.14
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 | 0.01 | 0.06
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 | 0.32 | 0.15
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 | 0.28 | 0.10
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 | 0.22 | 0.14
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 | 0.15 | 0.08
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 | $ 278 |
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 | 0.46 |

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