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Fair Value Measurement - Summary of Unobservable Inputs Used in Fair Value Measurements on Recurring Basis Categorized Within Level 3 of Fair Value Hierarchy (Details) - Fair Value, Measurements, Recurring - Level 3
 12 Months Ended
Dec. 31, 2019
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
Debt Instrument, Measurement Input [Extensible List] us-gaap:MeasurementInputDiscountRateMember
Single Issuer Trust Preferred | Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.051
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 0.056
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 0.029
Servicing Assets | Prepayment Speeds | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.249
Servicing Assets | Prepayment Speeds | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.147
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 0.056
Servicing Assets | Discount Rate | Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.321
Servicing Assets | Discount Rate | Weighted Average  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unobservable Inputs 0.125
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 1 month 6 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 10 months 24 days
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 4 years 3 months 18 days