FAIR VALUE - Summary of assets and liabilities measured at fair value on a recurring or nonrecurring, the significant unobservable inputs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	$ 1,490
Fair Value, Recurring
Summary of assets measured on a recurring and nonrecurring basis
Loans held at fair value, Fair value	15,464	$ 23,321
Guarantee asset, Fair Value	158	143
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Summary of assets measured on a recurring and nonrecurring basis
Loans held at fair value, Fair value	0	0
Guarantee asset, Fair Value	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Summary of assets measured on a recurring and nonrecurring basis
Loans held at fair value, Fair value	0	0
Guarantee asset, Fair Value	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Summary of assets measured on a recurring and nonrecurring basis
Loans held at fair value, Fair value	15,464	23,321
Guarantee asset, Fair Value	158	$ 143
Fair Value, Recurring | Corporate bonds | Minimum | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input		4.00%
Fair Value, Recurring | Corporate bonds | Maximum | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input		(18.00%)
Fair Value, Recurring | Corporate bonds | Weighted Average | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input		(8.00%)
Fair Value, Recurring | Loans Held at Fair Value | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held at fair value, Fair value	$ 15,464	$ 23,321
Fair Value, Recurring | Loans Held at Fair Value | Minimum | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input	8.00%
Fair Value, Recurring | Loans Held at Fair Value | Maximum | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input	9.00%
Fair Value, Recurring | Loans Held at Fair Value | Weighted Average | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Loans held for investment at fair value, measurement input	(8.00%)
Fair Value, Recurring | Guarantee Asset | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Guarantee assets, measurement input	6.00%	5.00%
Fair Value, Recurring | Guarantee Asset | Prepayment Rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Guarantee asset, Fair Value	$ 158	$ 143
Guarantee assets, measurement input	5.00%	4.00%
Fair Value, Recurring | Guarantee Asset | Weighted Average | Discount rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Guarantee assets, measurement input	(6.00%)	5.00%
Fair Value, Recurring | Guarantee Asset | Weighted Average | Prepayment Rate | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Summary of assets measured on a recurring and nonrecurring basis
Guarantee assets, measurement input	(5.00%)	4.00%
Fair Value, Recurring | IRLC, net
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	$ 319	$ 229
Fair Value, Recurring | IRLC, net | Quoted Prices in Active Markets for Identical Assets (Level 1)
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	0	0
Fair Value, Recurring | IRLC, net | Significant Other Observable Inputs (Level 2)
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	0	0
Fair Value, Recurring | IRLC, net | Significant Unobservable Inputs (Level 3)
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	319	229
Fair Value, Recurring | IRLC, net | Pull through | Significant Unobservable Inputs (Level 3) | Best execution model
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	$ 319	$ 229
Fair Value, Recurring | IRLC, net | Minimum | Pull through | Significant Unobservable Inputs (Level 3) | Best execution model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	0.53	0.73
Fair Value, Recurring | IRLC, net | Maximum | Pull through | Significant Unobservable Inputs (Level 3) | Best execution model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	1	1
Fair Value, Recurring | IRLC, net | Weighted Average | Pull through | Significant Unobservable Inputs (Level 3) | Best execution model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	(0.91)	0.91
Fair Value, Recurring | Equity Warrants | Volatility | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net		$ 825
Fair Value, Recurring | Equity Warrants | Risk-free interest rate | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
IRLC, net	$ 825
Fair Value, Recurring | Equity Warrants | Minimum | Volatility | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	0.327	0.327
Fair Value, Recurring | Equity Warrants | Minimum | Risk-free interest rate | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	0.0492	0.0404
Fair Value, Recurring | Equity Warrants | Minimum | Remaining life | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets, period (in years)	0 years	0 years
Fair Value, Recurring | Equity Warrants | Maximum | Volatility | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	0.889	0.889
Fair Value, Recurring | Equity Warrants | Maximum | Risk-free interest rate | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets		0.0414
Fair Value, Recurring | Equity Warrants | Maximum | Remaining life | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets, period (in years)	3 years	4 years
Fair Value, Recurring | Equity Warrants | Weighted Average | Volatility | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	(0.436)	0.348
Fair Value, Recurring | Equity Warrants | Weighted Average | Risk-free interest rate | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model
Summary of assets measured on a recurring and nonrecurring basis
Derivative assets	(0.0492)	0.0405
Fair Value, Nonrecurring | Commercial and Industrial
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	$ 4,575
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and Industrial
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2) | Commercial and Industrial
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial and Industrial
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	4,575
Fair Value, Nonrecurring | Commission and Cost to Sell | Significant Unobservable Inputs (Level 3) | Commercial and Industrial | Appraisal value
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	$ 4,575
Fair Value, Nonrecurring | Maximum | Commission and Cost to Sell | Significant Unobservable Inputs (Level 3) | Commercial and Industrial | Appraisal value
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans, measurement input	38.00%
Fair Value, Nonrecurring | Weighted Average | Commission and Cost to Sell | Significant Unobservable Inputs (Level 3) | Commercial and Industrial | Appraisal value
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans, measurement input	(21.00%)