FAIR VALUE MEASURES - Summary of Fair Value Measurements of Assets Measured at Fair Value on Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	$ 251,125	$ 239,859
Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	0
Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	5,839
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	251,125	234,020
Collateral-dependent loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	44,181	98,426
Collateral-dependent loans | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	0
Collateral-dependent loans | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	0
Collateral-dependent loans | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	44,181	98,426
Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		4,964
Other real estate owned | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		0
Other real estate owned | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		0
Other real estate owned | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		4,964
Mortgage servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	206,944	130,630
Mortgage servicing rights | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	0
Mortgage servicing rights | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	0	0
Mortgage servicing rights | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value	$ 206,944	130,630
SBA servicing rights
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		5,839
SBA servicing rights | Level 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		0
SBA servicing rights | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		5,839
SBA servicing rights | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets at fair value		$ 0