FAIR VALUE DISCLOSURES - Valuation Methodology and Unobservable Inputs for Level 3 Assets (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 5,414	$ 11,992
Commercial and industrial loans: | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 5,019	$ 11,532
Commercial and industrial loans: | Average | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.74	0.62
Commercial and industrial loans: | Minimum | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.10	0.29
Commercial and industrial loans: | Maximum | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.99	0.99
Commercial Real Estate and Multifamily Residential | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 369	$ 425
Commercial Real Estate and Multifamily Residential | Average | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.75	0.57
Commercial Real Estate and Multifamily Residential | Minimum | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs		0.37
Commercial Real Estate and Multifamily Residential | Maximum | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs		0.76
Agri-business and agricultural loans | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 26	$ 35
Agri-business and agricultural loans | Average | Valuation, Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.75	0.76
Other Real Estate Owned | Valuation, Cost Approach | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 384	$ 100
Other Real Estate Owned | Average | Valuation, Cost Approach | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Average and Range of Inputs	0.36	0.68