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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability $ 1,547,892 $ 1,354,056
Estimate Fair Value Gain 13,070 12,559
Estimate Fair Value Loss (13,078) (12,587)
Other Credit Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 21,300 17,800
Credit Risk Derivative Liabilities, at Fair Value 100 200
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities    
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 773,946 677,028
Estimate Fair Value Gain 3,582 4,158
Estimate Fair Value Loss (9,496) (8,429)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets    
Derivatives, Fair Value [Line Items]    
Inerest-bearing deposit liability 773,946 677,028
Estimate Fair Value Gain 9,488 8,401
Estimate Fair Value Loss $ (3,582) $ (4,158)