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Fair Value Measurement - Summary of Unobservable Inputs Used in the Fair Value Measurements on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Level 3
 9 Months Ended
Sep. 30, 2021
Single Issuer Trust Preferred  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Impact to Valuation from an Increased or Higher Input Value Decrease
Debt Instrument, Valuation Technique [Extensible List] us-gaap:ValuationTechniqueDiscountedCashFlowMember
Single Issuer Trust Preferred | Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.031
Single Issuer Trust Preferred | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.064
Single Issuer Trust Preferred | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.045
Servicing Assets  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Servicing Asset, Valuation Technique [Extensible List] us-gaap:ValuationTechniqueDiscountedCashFlowMember
Servicing Assets | Prepayment Speeds  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Impact to Valuation from an Increased or Higher Input Value Decrease
Servicing Assets | Prepayment Speeds | Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.005
Servicing Assets | Prepayment Speeds | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.318
Servicing Assets | Prepayment Speeds | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.143
Servicing Assets | Discount Rate  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Impact to Valuation from an Increased or Higher Input Value Decrease
Servicing Assets | Discount Rate | Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.030
Servicing Assets | Discount Rate | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.500
Servicing Assets | Discount Rate | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.081
Servicing Assets | Expected Weighted Average Loan life  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Impact to Valuation from an Increased or Higher Input Value Increase
Servicing Assets | Expected Weighted Average Loan life | Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected weighted average loan life 2 months 12 days
Servicing Assets | Expected Weighted Average Loan life | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected weighted average loan life 8 years 6 months
Servicing Assets | Expected Weighted Average Loan life | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected weighted average loan life 3 years 10 months 24 days