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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Line Items]            
Reserves for unfunded commitments $ 13,600     $ 13,600   $ 12,500
Loans and Leases Receivable, Commitments, Fixed Rates   $ 123,600   143,700    
Loans and Leases Receivable, Commitments, Variable Rates   $ 3,300,000   $ 3,700,000    
Loan Commitments, Fixed Interest Rate Range, Minimum       0.00%   0.00%
Loan Commitments, Fixed Interest Rate Range, Maximum       21.00%   21.00%
Loan Commitments, Fixed Rate, Maturities, Minimum       1 year   1 year
Loan Commitments, Fixed Rate, Maturities, Maximum       30 years   30 years 9 months 18 days
Letters of credit issued to guarantee performance of a client to a third party 37,100     $ 37,100   $ 36,100
Amortization Method Qualified Affordable Housing Project Investments, Amortization 3,579   $ 2,130 5,824 $ 4,332  
Estimated Litigation Liability 0     0   0
Settled Litigation            
Commitments and Contingencies Disclosure [Line Items]            
Litigation Settlement, Expense       3,800    
Commitments to Extend Credit            
Commitments and Contingencies Disclosure [Line Items]            
Commitments outstanding to extend credit $ 3,800,000     $ 3,800,000   $ 3,400,000