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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | $ 2,813,828 | $ 2,719,980
Derivative Asset | 38,801 | 29,189
Estimate Fair Value Loss | (38,808) | (29,188)
Other Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | 32,800 | 12,300
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 | 1,406,914 | 1,359,990
Derivative Asset | 5,580 | 11,787
Estimate Fair Value Loss | (33,228) | (17,401)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Inerest-bearing deposit liability | 1,406,914 | 1,359,990
Derivative Asset | 33,221 | 17,402
Estimate Fair Value Loss | $ (5,580) | $ (11,787)

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