Fair Value of Financial Instruments - Analysis of Level 3 Valuation Techniques (Details) - Non-recurring Fair Value $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	$ 18,259	$ 5,224
Municipal bonds | Discounted Expected Cash Flows | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Municipal bond, measurement input	0.0455	0.0514
Municipal bonds | Discounted Expected Cash Flows | Prepayment speed
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Municipal bond, measurement input	0.0500	0.0500
Impaired Loans | Minimum | Discounted appraisals | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.10	0.08
Impaired Loans | Maximum | Discounted appraisals | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.57	0.48
Foreclosed Assets | Minimum | Discounted appraisals | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.10	0.09
Foreclosed Assets | Maximum | Discounted appraisals | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.37	0.37
Equity Warrant Assets | Black-Scholes Option Pricing Model | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.20	0.2000
Equity Warrant Assets | Black-Scholes Option Pricing Model | Expected Volatility Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input		0.2040
Equity Warrant Assets | Black-Scholes Option Pricing Model | Risk-Free Interest Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.0190	0.0269
Equity Warrant Assets | Minimum | Black-Scholes Option Pricing Model | Expected Volatility Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.21
Equity Warrant Assets | Minimum | Black-Scholes Option Pricing Model | Expected Term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	8 years	9 years
Equity Warrant Assets | Maximum | Black-Scholes Option Pricing Model | Expected Volatility Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	0.75
Equity Warrant Assets | Maximum | Black-Scholes Option Pricing Model | Expected Term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Measurement input	10 years	10 years
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	$ 9,521	$ 5,224
Level 3 | Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	92	999
Level 3 | Impaired Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	3,909	4,130
Level 3 | Foreclosed Assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	5,612	1,094
Level 3 | Equity Warrant Assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Asset, fair value	$ 570	$ 527