FAIR VALUE - Summary of assets and liabilities measured at fair value on a recurring or nonrecurring, the significant unobservable inputs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 58,727	$ 55,562
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	17,083	8,325
Nonrecurring | Level 3 | Commercial and Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Estimate	$ 439
Nonrecurring | Management discount for asset/property type | Level 3 | Commercial and Industrial | Sales Comparison, Market Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value		$ 439
Nonrecurring | Minimum | Management discount for asset/property type | Level 3 | Commercial and Industrial | Sales Comparison, Market Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	7.00%	17.00%
Nonrecurring | Maximum | Management discount for asset/property type | Level 3 | Commercial and Industrial | Sales Comparison, Market Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	45.00%	45.00%
Nonrecurring | Weighted Average | Management discount for asset/property type | Level 3 | Commercial and Industrial | Sales Comparison, Market Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	38.00%	39.00%
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 58,727	$ 55,562
Loans held at fair value, Fair value	6,380
Guarantee asset, Fair Value	206	237
Equity warrants, Fair value	402	160
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	6,215	2,113
Loans held at fair value, Fair value	6,380
Guarantee asset, Fair Value	206	237
Equity warrants, Fair value	$ 402	$ 160
Recurring | Discount rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	3.00%	3.00%
Recurring | Prepayment rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	11.00%	18.00%
Recurring | Weighted Average | Discount rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	3.00%	3.00%
Recurring | Weighted Average | Prepayment rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	11.00%	18.00%
Recurring | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 17,083	$ 8,325
Recurring | Corporate bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	6,215	2,113
Recurring | Corporate bonds | Discount rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 6,215
Derivative assets, Fair Value		$ 2,113
Range and weighted average of discount rate	5.00%	7.00%
Recurring | Corporate bonds | Weighted Average | Discount rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate		7.00%
Recurring | Loans Held at Fair Value | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held at fair value, Fair value	$ 6,380
Recurring | Loans Held at Fair Value | Discount rate | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount	19.00%
Recurring | Loans Held at Fair Value | Weighted Average | Discount rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount	19.00%
Recurring | Guarantee Asset | Prepayment rate | Level 3 | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guarantee asset, Fair Value	$ 206	$ 237
Recurring | IRLC,net | Pull through | Level 3 | Best execution model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value	$ 990	$ 1,473
Range and weighted average of discount rate	93.00%
Recurring | IRLC,net | Minimum | Pull through | Level 3 | Best execution model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	67.00%	71.00%
Recurring | IRLC,net | Maximum | Pull through | Level 3 | Best execution model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	100.00%	100.00%
Recurring | IRLC,net | Weighted Average | Pull through | Level 3 | Best execution model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate		88.00%
Recurring | IRLC,net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value	$ 990	$ 1,473
Recurring | IRLC,net | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value	$ 990	1,473
Recurring | Equity Warrants | Volatility | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value		$ 160
Range and weighted average of discount rate	32.00%
Recurring | Equity Warrants | Risk-free interest rate | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants, Fair value	$ 402
Range and weighted average of discount rate		1.10%
Recurring | Equity Warrants | Minimum | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range term		0 years
Recurring | Equity Warrants | Minimum | Volatility | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	24.00%	24.00%
Recurring | Equity Warrants | Minimum | Risk-free interest rate | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	0.30%
Recurring | Equity Warrants | Minimum | Remaining life | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range term	0 years
Recurring | Equity Warrants | Maximum | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range term		4 years
Recurring | Equity Warrants | Maximum | Volatility | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	37.00%	37.00%
Recurring | Equity Warrants | Maximum | Risk-free interest rate | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	1.10%	0.30%
Recurring | Equity Warrants | Maximum | Remaining life | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range term	4 years
Recurring | Equity Warrants | Weighted Average | Volatility | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate		32.00%
Recurring | Equity Warrants | Weighted Average | Risk-free interest rate | Level 3 | Black-Scholes option pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range and weighted average of discount rate	0.97%	0.97%
Recurring | Forward Commitment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value	$ 1,478	$ (74)
Recurring | Forward Commitment | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value		(9)
Recurring | Forward Commitment | Market Differential | Level 3 | Internal Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, Fair Value		$ (9)
Recurring | Forward Commitment | Minimum | Market Differential | Level 3 | Internal Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		(0.14)
Recurring | Forward Commitment | Maximum | Market Differential | Level 3 | Internal Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		(0.02)
Recurring | Forward Commitment | Weighted Average | Market Differential | Level 3 | Internal Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		(0.06)