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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Line Items]          
Reserves for unfunded commitments $ 16,700,000   $ 16,700,000   $ 600,000
Commitments outstanding to extend credit 0   0   0
Loans and Leases Receivable, Commitments, Fixed Rates     142,800,000   123,700,000
Loans and Leases Receivable, Commitments, Variable Rates     $ 3,300,000,000   $ 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 9 months 18 days   31 years 7 months 6 days
Letters of credit issued to guarantee performance of a client to a third party 35,900,000   $ 35,900,000   $ 33,400,000
Affordable Housing Program Obligation 34,100,000   34,100,000   38,500,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization     4,100,000 $ 3,800,000  
Affordable housing contingent commitment 0   0   0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 6,700,000   6,700,000   5,100,000
Estimated Litigation Liability 0   0   0
Commitments to Extend Credit          
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit 3,400,000,000   3,400,000,000   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 3,700,000 3,200,000  
Historic tax credit [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 100,000 $ 55,000.0 200,000 100,000  
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 $ 3,700,000   $ 3,700,000   $ 3,100,000