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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
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 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 $ 558,956 $ 565,069 $ 532,980 $ 515,514 $ 520,324 $ 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