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)