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FAIR VALUE - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 3.40% |  |  |
Mortgage servicing rights | $ 3,100,000 |  |  |
Mortgage servicing rights, impairment | 715,000 |  |  |
Amortized cost | 2,400,000 |  |  |
Valuation reserve | $ 0 | $ 715,000 | $ 0 |
Weighted average maturity of residential mortgages | 20 years |  |  |
Prepayment Speed used in unobservable assumptions | 249 | 204 |  |
Discount rate used to estimate fair value | 9.50% | 9.40% |  |
Gross loans | $ 4,291,105,000 | $ 4,657,183,000 |  |
Valuation allowance after adoption of ASC 326 | 67,773,000 | 61,408,000 | 50,652,000 | $ 48,453,000
Recoveries | 2,221,000 | $ 1,239,000 | $ 874,000 |
Minimum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Amount of variance | $ 100,000 |  |  |
Minimum | Commercial Real Estates | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 0.00% |  |  |
Minimum | Inventory Finished Goods | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 35.00% |  |  |
Minimum | Finished Goods | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |  |  |
Minimum | Inventory Work In Process | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 50.00% |  |  |
Minimum | Equipment | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |  |  |
Minimum | Marketable Securities | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 10.00% |  |  |
Maximum | Commercial Real Estates | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 50.00% |  |  |
Maximum | Inventory Finished Goods | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 65.00% |  |  |
Maximum | Finished Goods | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 60.00% |  |  |
Maximum | Inventory Work In Process | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 100.00% |  |  |
Maximum | Equipment | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 70.00% |  |  |
Maximum | Marketable Securities | Level 3 |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |  |  |
Municipal Notes | Minimum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of variance | 5.00% |  |  |
Municipal Notes | Maximum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of variance | 5.00% |  |  |
US Government Agencies Short-term Debt Securities | Minimum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of variance | (3.00%) |  |  |
U.S. Treasury securities | Minimum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of variance | (1.00%) |  |  |
U.S. Treasury securities | Maximum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Percentage of variance | (1.00%) |  |  |

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