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FAIR VALUE - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Mortgage servicing rights | $ 4,000,000.0 |  | $ 4,000,000.0 |  |  |  |  |
Servicing Asset at Fair Value, Amount | 4,000,000.0 |  | $ 4,000,000.0 |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 3.80% |  |  |  |  |
Weighted average maturity of residential mortgages |  |  | 20 years |  |  |  |  |
Prepayment Speed used in unobservable assumptions |  |  | 198 |  | 118 |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information |  |  | 198 |  | 118 |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate |  |  | 9.40% |  | 9.40% |  |  |
Discount rate used to estimate fair value (in hundredths) |  |  | 9.40% |  | 9.40% |  |  |
Subtotal | 4,505,388,000 |  | $ 4,505,388,000 |  | $ 4,067,385,000 |  |  |
Valuation allowance | 59,019,000 | $ 50,564,000 | 59,019,000 | $ 50,564,000 | 50,652,000 | $ 53,609,000 | $ 49,562,000 | $ 48,453,000
Provision for Loan and Lease Losses | 5,500,000 | 785,000 | 12,100,000 | 1,985,000 |  |  |  |
Recoveries | 321,000 | 301,000 | 527,000 | 494,000 |  |  |  |
Loans and Leases Receivable, Gross | 4,505,388,000 |  | 4,505,388,000 |  | 4,067,385,000 |  |  |
Loans and Leases Receivable, Allowance | 59,019,000 | 50,564,000 | 59,019,000 | 50,564,000 | $ 50,652,000 | $ 53,609,000 | $ 49,562,000 | $ 48,453,000
Mortgage servicing rights, fair value | 4,000,000.0 |  | 4,000,000.0 |  |  |  |  |
Mortgage servicing rights, impairment |  |  | 506,000 |  |  |  |  |
Mortgage servicing rights, at amortized cost | 3,500,000 |  | 3,500,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Amount of variance |  |  | $ 100,000 |  |  |  |  |
Commercial Real Estates | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 0.00% |  |  |  |  |
Commercial Real Estates | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 50.00% |  |  |  |  |
Inventory Finished Goods | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 35.00% |  |  |  |  |
Inventory Finished Goods | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 65.00% |  |  |  |  |
Finished Goods | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 30.00% |  |  |  |  |
Finished Goods | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 60.00% |  |  |  |  |
Inventory Work In Process | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 50.00% |  |  |  |  |
Inventory Work In Process | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 100.00% |  |  |  |  |
Equipment | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 30.00% |  |  |  |  |
Equipment | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 70.00% |  |  |  |  |
Marketable Securities | Minimum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 10.00% |  |  |  |  |
Marketable Securities | Maximum | Level 3 |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of discount from appraised value (in hundredths) |  |  | 30.00% |  |  |  |  |
Impaired Loans |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Subtotal | 19,000,000.0 | 18,800,000 | $ 19,000,000.0 | 18,800,000 |  |  |  |
Valuation allowance | 7,900,000 | 9,600,000 | 7,900,000 | 9,600,000 |  |  |  |
Provision for Loan and Lease Losses | 500,000 |  | 642,000 |  |  |  |  |
Recoveries |  | 300,000 |  | 100,000 |  |  |  |
Loans and Leases Receivable, Gross | 19,000,000.0 | 18,800,000 | 19,000,000.0 | 18,800,000 |  |  |  |
Loans and Leases Receivable, Allowance | $ 7,900,000 | $ 9,600,000 | $ 7,900,000 | $ 9,600,000 |  |  |  |
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%) |  |  |  |  |
US Government Agencies Short-term Debt Securities | Maximum |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Variance |  |  | 3.00% |  |  |  |  |
US Treasury Securities | Minimum |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Variance |  |  | (1.00%) |  |  |  |  |
US Treasury Securities | Maximum |  |  |  |  |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Variance |  |  | 1.00% |  |  |  |  |

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