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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