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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, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 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) $ 520,324 $ 523,426 $ 546,388 $ 538,459 $ 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)