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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact to Financial Statements Upon Adoption of ASC 326 (Details) - USD ($) $ in Thousands | Jan. 01, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Allowance for credit losses on off-balance sheet commitments | $ 137 |  |  |  |
Total impact from ASC 326 adoption | (3,909) | $ 523,426 | $ 546,388 | $ 522,441 | $ 527,122
Tax Effect [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Allowance for credit losses on off-balance sheet commitments | (51) |  |  |  |
Total impact from ASC 326 adoption | 1,439 |  | $ 550,297 |  |
Impact to Consolidated Statement of Condition from ASC-326 Adoption [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Allowance for credit losses on off-balance sheet commitments | 188 |  |  |  |
Total impact from ASC 326 adoption | (5,348) |  |  |  |
Allowance For Credit Losses on Loans [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Assets | 4,046 |  |  |  |
Allowance For Credit Losses on Loans [Member] | Tax Effect [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Assets | 1,490 |  |  |  |
Allowance For Credit Losses on Loans [Member] | Impact to Consolidated Statement of Condition from ASC-326 Adoption [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Assets | $ (5,536) |  |  |  |

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