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BASIS OF PRESENTATION - Impact of Adoption of the ASU (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 | $ 73,048 | [1] | $ 71,713 |  | $ 61,408 |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 61,408 | [1] | $ 60,747 | $ 59,019 | $ 50,652
ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | $ 61,408 |  |  |  |  |
Commercial and industrial loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 28,333 |  | 28,363 | 26,744 | 25,789
Commercial and industrial loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 28,333 |  |  |  |  |
Commercial real estate and multi-family residential loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 22,907 |  | 21,415 | 21,063 | 15,796
Commercial real estate and multi-family residential loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 22,907 |  |  |  |  |
Agri-business and agricultural loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 3,043 |  | 3,097 | 3,408 | 3,869
Agri-business and agricultural loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 3,043 |  |  |  |  |
Other commercial loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 416 |  |  |  |  |
Consumer 1-4 family loans |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 2,619 |  | 3,318 | 3,434 | 2,086
Consumer 1-4 family loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 2,619 |  |  |  |  |
Other consumer loans | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 951 |  |  |  |  |
Unallocated |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 | $ 380 |  | $ 506 |  | 3,139 |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  |  | 3,139 |  | $ 3,152 | $ 3,054 | $ 2,320
Unallocated | ASU 2016-13 | Pre-ASC 326 Adoption |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance before adoption of ASC 326 |  |  |  | 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 | Commercial and industrial loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 32,645 |  |  |  |  |
As Reported Under ASC 326 | Commercial real estate and multi-family residential loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 27,223 |  |  |  |  |
As Reported Under ASC 326 | Agri-business and agricultural loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 4,103 |  |  |  |  |
As Reported Under ASC 326 | Other commercial loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 1,357 |  |  |  |  |
As Reported Under ASC 326 | Consumer 1-4 family loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 3,572 |  |  |  |  |
As Reported Under ASC 326 | Other consumer loans | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  | 1,300 |  |  |  |  |
As Reported Under ASC 326 | Unallocated | As Reported Under ASC 326 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
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 | 9,050 |  |  |  |
Impact of ASC 326 Adoption | Commercial and industrial loans |  |  |  |  |  |  |  |  |
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 loans |  |  |  |  |  |  |  |  |
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 loans |  |  |  |  |  |  |  |  |
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 loans |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
Impact of ASC 326 Adoption | Unallocated | ASU 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Valuation allowance after adoption of ASC 326 |  |  |  |  | $ (2,881) |  |  |  |
[1] | Beginning January 1, 2021 calculation is based on the current expected credit loss methodology. Prior to January 1, 2021 calculation was based on the incurred loss methodology.

X
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