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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Commitments and Contingencies Disclosure [Line Items]          
Reserves for unfunded commitments $ 700   $ 700   $ 500
Commitments outstanding to extend credit 0   0   0
Letters of credit issued to guarantee performance of a client to a third party 34,000   34,000   25,300
Affordable Housing Program Obligation 42,200   42,200   35,900
Affordable housing contingent commitment 0   0   0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 2,900   2,900   3,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 2,900   2,900   3,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1,400 $ 1,000 4,300 $ 3,200  
Estimated Litigation Liability 0   0   0
Loans and Leases Receivable, Commitments, Fixed Rates     202,700   44,300
Loans and Leases Receivable, Commitments, Variable Rates     $ 2,700,000   2,000,000
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    
Loan Commitments, Fixed Rate, Maturities, Maximum     30 years    
Commitments to Extend Credit          
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit 2,900,000   $ 2,900,000   $ 2,100,000
Affordable housing investment [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 1,300 800 3,600 2,400  
Historic tax credit [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit $ 100 $ 100 $ 400 $ 400