FAIR VALUE MEASUREMENTS - Recorded Amounts of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 240,270	$ 1,191,378
Investment in equity securities	16,025	16,025
Agency Mortgage-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	9,000	928,989
Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	46,834	52,146
SBA securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	23,105	27,972
Beneficial interest - FHLMC securitizations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	8,990	11,580
Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	141,499	156,376
U.S. Treasury
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	837	490
Fair Value on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in equity securities	16,025	16,025
Total assets at fair value on a recurring basis	256,295	1,207,403
Fair Value on Recurring Basis | Collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	10,005	13,825
Fair Value on Recurring Basis | Agency Mortgage-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	9,000	928,989
Fair Value on Recurring Basis | Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	46,834	52,146
Fair Value on Recurring Basis | SBA securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	23,105	27,972
Fair Value on Recurring Basis | Beneficial interest - FHLMC securitizations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	8,990	11,580
Fair Value on Recurring Basis | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	141,499	156,376
Fair Value on Recurring Basis | U.S. Treasury
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	837	490
Fair Value Measurement Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in equity securities		16,025
Fair Value Measurement Level 1 | Fair Value on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in equity securities		16,025
Total assets at fair value on a recurring basis	837	16,515
Fair Value Measurement Level 1 | Fair Value on Recurring Basis | U.S. Treasury
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	837	490
Fair Value Measurement Level 2 | Fair Value on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets at fair value on a recurring basis	230,443	1,179,308
Fair Value Measurement Level 2 | Fair Value on Recurring Basis | Collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	10,005	13,825
Fair Value Measurement Level 2 | Fair Value on Recurring Basis | Agency Mortgage-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	9,000	928,989
Fair Value Measurement Level 2 | Fair Value on Recurring Basis | Municipal bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	46,834	52,146
Fair Value Measurement Level 2 | Fair Value on Recurring Basis | SBA securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	23,105	27,972
Fair Value Measurement Level 2 | Fair Value on Recurring Basis | Corporate Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	141,499	156,376
Fair Value Measurement Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in equity securities	16,025
Fair Value Measurement Level 3 | Fair Value on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in equity securities	16,025
Total assets at fair value on a recurring basis	25,015	11,580
Fair Value Measurement Level 3 | Fair Value on Recurring Basis | Beneficial interest - FHLMC securitizations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 8,990	$ 11,580