Fair Value - Schedule of valuation technique and unobservable inputs used in the valuation of SBA loans held for investment, at fair value (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, at fair value	$ 9,614	$ 9,264
Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, at fair value	9,614	9,264
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, at fair value	9,614	9,264
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net	1,412	7,553
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Best efforts forward sales contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net	$ 27	$ 55
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.0322	0.0324
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Minimum | Conditional Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.1056	0.1053
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Minimum | Pull-through expectations | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	0.2400	0.5250
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Minimum | Pull-through expectations | Best efforts forward sales contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	0.2400	0.5250
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.0672	0.0674
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Maximum | Conditional Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.1056	0.1056
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Maximum | Pull-through expectations | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	1.0000	1.0000
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Maximum | Pull-through expectations | Best efforts forward sales contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	0.8000	0.8000
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.0422	0.0437
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Weighted Average | Conditional Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
SBA loans held for investment, measurement input	0.1056	0.1055
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Weighted Average | Pull-through expectations | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	0.8440	0.8163
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Weighted Average | Pull-through expectations | Best efforts forward sales contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, net, measurement input	0.6579	0.7337