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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 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | ---
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 | $ 565,069 | $ 554,958 | $ 532,980 | $ 520,324 | $ 523,426 | $ 546,388
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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