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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Line Items]          
Reserves for unfunded commitments $ 14,800,000   $ 14,800,000   $ 600,000
Loans and Leases Receivable, Commitments, Fixed Rates     128,800,000   123,700,000
Loans and Leases Receivable, Commitments, Variable Rates     $ 3,400,000,000   $ 3,200,000,000
Loan Commitments, Fixed Interest Rate Range, Minimum     0.00%    
Loan Commitments, Fixed Interest Rate Range, Maximum     21.00%    
Loan Commitments, Fixed Rate, Maturities, Minimum     1 year   1 year
Loan Commitments, Fixed Rate, Maturities, Maximum     30 years   31 years 7 months 6 days
Letters of credit issued to guarantee performance of a client to a third party 37,600,000   $ 37,600,000   $ 33,400,000
Affordable Housing Program Obligation 43,500,000   43,500,000   38,500,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 2,000,000.0 $ 1,600,000 6,100,000 $ 5,400,000  
Affordable housing contingent commitment 0   0   0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 4,100,000   4,100,000   5,100,000
Estimated Litigation Liability 0   0   0
Commitments to Extend Credit          
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit 3,500,000,000   3,500,000,000   3,300,000,000
Affordable housing investment [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 1,800,000 1,600,000 5,500,000 4,800,000  
Historic tax credit [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 100,000 $ 30,000.0 300,000 100,000  
Minimum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Loans and Leases Receivable, Commitments, Variable Rates       0.000  
Maximum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Loans and Leases Receivable, Commitments, Variable Rates       $ 0.210  
Variable Interest Entity, Not Primary Beneficiary [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Historic Tax Credit Recorded Investment $ 3,800,000   $ 3,800,000   $ 3,100,000