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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption of the ASU (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 | $ 67,773 |  | $ 61,408 | $ 50,652 | $ 48,453
Commercial and Industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  | 28,333 |  |
Commercial Real Estate and Multi-family Residential |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  | 22,907 |  |
Agri-business and Agricultural |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  | 3,043 |  |
Consumer 1-4 Family Mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  | 2,619 |  |
Unallocated |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 | $ 450 |  | 3,139 | $ 2,320 | $ 3,294
Pre-ASC 326 Adoption | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | $ 61,408 |  |  |
Pre-ASC 326 Adoption | Commercial and Industrial | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 28,333 |  |  |
Pre-ASC 326 Adoption | Commercial Real Estate and Multi-family Residential | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 22,907 |  |  |
Pre-ASC 326 Adoption | Agri-business and Agricultural | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 3,043 |  |  |
Pre-ASC 326 Adoption | Other commercial loans | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 416 |  |  |
Pre-ASC 326 Adoption | Consumer 1-4 Family Mortgage | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 2,619 |  |  |
Pre-ASC 326 Adoption | Other consumer loans | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 951 |  |  |
Pre-ASC 326 Adoption | Unallocated | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Pre-ASC 326 Adoption |  | 3,139 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 70,458 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Commercial and Industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 32,645 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Commercial Real Estate and Multi-family Residential |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 27,223 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Agri-business and Agricultural |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 4,103 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Other commercial loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 1,357 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Consumer 1-4 Family Mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 3,572 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Other consumer loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 1,300 |  |  |
As Reported Under ASC 326 | As Reported Under ASC 326 | Unallocated |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 258 |  |  |
Impact of ASC 326 Adoption |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 9,050 | 9,050 |  |
Impact of ASC 326 Adoption | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 9,100 |  |  |
Impact of ASC 326 Adoption | Commercial and Industrial |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 4,312 |  |  |
Impact of ASC 326 Adoption | Commercial Real Estate and Multi-family Residential |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 4,316 |  |  |
Impact of ASC 326 Adoption | Agri-business and Agricultural |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 1,060 |  |  |
Impact of ASC 326 Adoption | Other commercial loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 941 |  |  |
Impact of ASC 326 Adoption | Consumer 1-4 Family Mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 953 |  |  |
Impact of ASC 326 Adoption | Other consumer loans |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | 349 |  |  |
Impact of ASC 326 Adoption | Unallocated |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  | $ (2,881) | $ (2,881) |  |

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