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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Commitments and Contingencies Disclosure [Line Items]          
Reserves for unfunded commitments $ 400,000   $ 400,000   $ 700,000
Commitments outstanding to extend credit 0   0   0
Loans and Leases Receivable, Commitments, Fixed Rates     129,000,000.0   174,000,000.0
Loans and Leases Receivable, Commitments, Variable Rates     $ 3,000,000,000.0   $ 2,900,000,000
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   30 years
Letters of credit issued to guarantee performance of a client to a third party 32,000,000.0   $ 32,000,000.0   $ 32,700,000
Affordable Housing Program Obligation 36,300,000   36,300,000   39,400,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1,600,000 $ 1,400,000 5,400,000 $ 4,300,000  
Affordable housing contingent commitment 0   0   0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 3,700,000   3,700,000   3,900,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,700,000   3,700,000   3,900,000
Estimated Litigation Liability 0   0   0
Commitments to Extend Credit          
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit 3,200,000,000   3,200,000,000   3,000,000,000.0
Affordable housing investment [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 1,600,000 1,300,000 4,800,000 3,600,000  
Historic tax credit [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit $ 0 $ 100,000 $ 100,000 $ 400,000  
Maximum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Loans and Leases Receivable, Commitments, Variable Rates         0.210
Minimum [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Loans and Leases Receivable, Commitments, Variable Rates         $ 0.000