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FAIR VALUE - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | $ 4,200,000 |  |  |
Valuation reserve | 715,000 | $ 0 | $ 0 |
Amortized cost | 3,500,000 |  |  |
Servicing Asset at Fair Value, Amount | $ 4,200,000 |  |  |
Percentage of discount from appraised value (in hundredths) | 3.70% |  |  |
Weighted average maturity of residential mortgages | 20 years |  |  |
Prepayment Speed used in unobservable assumptions | 204 | 118 |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information | 204 | 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 | $ 4,657,183,000 | $ 4,067,385,000 |  |
Valuation allowance | 61,408,000 | 50,652,000 | 48,453,000 | $ 47,121,000
Provision for Loan and Lease Losses | 14,770,000 | 3,235,000 | 6,400,000 |
Recoveries | 1,239,000 | 874,000 | 1,043,000 |
Loans and Leases Receivable, Gross | 4,657,183,000 | 4,067,385,000 |  |
Loans and Leases Receivable, Allowance | 61,408,000 | 50,652,000 | $ 48,453,000 | $ 47,121,000
Ten Percent Adverse Changes In Psa |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | 146,000 |  |  |
Servicing Asset at Fair Value, Amount | 146,000 |  |  |
Twenty Percent Adverse Changes In Psa |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | 285,000 |  |  |
Servicing Asset at Fair Value, Amount | 285,000 |  |  |
Ten Percent Adverse Changes In Discount Rate |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | 115,000 |  |  |
Servicing Asset at Fair Value, Amount | 115,000 |  |  |
Twenty Percent Adverse Changes In Discount Rate |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | 224,000 |  |  |
Servicing Asset at Fair Value, Amount | 224,000 |  |  |
Impaired Loans |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Subtotal | 14,600,000 | 22,200,000 |  |
Valuation allowance | 7,800,000 | 10,100,000 |  |
Recoveries | 2,300,000 | 600,000 |  |
Loans and Leases Receivable, Gross | 14,600,000 | 22,200,000 |  |
Loans and Leases Receivable, Allowance | 7,800,000 | $ 10,100,000 |  |
Minimum |  |  |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Amount of variance | $ 100,000 |  |  |
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%) |  |  |
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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