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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit $ 0   $ 0   $ 0
Letters of credit issued to guarantee performance of a client to a third party 25,300   25,300   18,400
Affordable Housing Program Obligation 39,200   39,200   32,700
Affordable housing contingent commitment 0   0   0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets 4,900   4,900   4,900
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 13,700   13,700   13,700
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1,000 $ 600 3,200 $ 2,100  
Estimated Litigation Liability 0   0   0
Loans and Leases Receivable, Commitments, Fixed Rates     103,300    
Loans and Leases Receivable, Commitments, Variable Rates     $ 2,100,000    
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     29 years    
Commitments to Extend Credit          
Commitments and Contingencies Disclosure [Line Items]          
Commitments outstanding to extend credit 2,200,000   $ 2,200,000   $ 2,000,000
Affordable housing investment [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit 800 500 2,400 1,600  
Historic tax credit [Member]          
Commitments and Contingencies Disclosure [Line Items]          
Low-income housing tax credit $ 100 $ 100 $ 400 $ 400