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DERIVATIVES - Additional Information (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) entity | Dec. 31, 2017 USD ($) entity
Derivative [Line Items] |  |
Maximum derivative notional position as a percentage of assets | 35.00% |
Maximum credit exposure as a percentage of capital | 3.00% |
Maximum single counterparty credit risk exposure | $ 20,000 |
Inerest-bearing deposit liability | $ 2,624,586 | $ 1,674,080
Number of counterparties | entity | 13 | 13
Derivative Asset | $ 33,286 | $ 12,682
Derivative Financial Instruments, Liabilities, Fair Value Disclosure | 33,278 | 12,687
Interest Rate Lock Commitments [Member] |  |
Derivative [Line Items] |  |
Inerest-bearing deposit liability | 20,800 | 12,300
Other Credit Derivatives [Member] |  |
Derivative [Line Items] |  |
Inerest-bearing deposit liability | 20,800 | 15,400
Credit Risk Derivative Liabilities, at Fair Value |  | 100
Credit Risk Contract [Member] |  |
Derivative [Line Items] |  |
Inerest-bearing deposit liability | 150,100 | 95,900
Credit Risk Derivative Liabilities, at Fair Value |  | 100
Accrued interest and other liabilities | Derivative [Member] |  |
Derivative [Line Items] |  |
Inerest-bearing deposit liability | 1,300,000 | 837,500
Derivative Asset | $ (26,000) |
Derivative Financial Instruments, Liabilities, Fair Value Disclosure |  | $ 1,300

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 + Details
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