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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | $ 2,358,312 | $ 1,674,080
Derivative Asset | 27,567 | 12,682
Estimate Fair Value Loss | (27,565) | (12,687)
Other Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | 35,600 | 15,400
Credit Risk Derivative Liabilities, at Fair Value |  | 100
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | 1,179,156 | 837,040
Derivative Asset | 24,306 | 5,529
Estimate Fair Value Loss | (3,259) | (7,158)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | 1,179,156 | 837,040
Derivative Asset | 3,261 | 7,153
Estimate Fair Value Loss | $ (24,306) | $ (5,529)

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