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FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Derivatives | $ 38,801 | $ 29,189
Investment securities available-for-sale | 3,113,811 | 2,779,255
Liabilities |  |
Derivatives | 38,808 | 29,188
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives | 39,062 | 29,543
Investment securities available-for-sale | 3,113,811 | 2,779,255
Total | 3,152,873 | 2,808,798
Liabilities |  |
Derivatives | 38,985 | 29,336
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 |  |
Assets |  |
Derivatives | 0 | 0
Investment securities available-for-sale | 98 | 97
Total | 98 | 97
Liabilities |  |
Derivatives | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 |  |
Assets |  |
Derivatives | 39,062 | 29,543
Investment securities available-for-sale | 3,100,358 | 2,764,443
Total | 3,139,420 | 2,793,986
Liabilities |  |
Derivatives | 38,985 | 29,336
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 |  |
Assets |  |
Derivatives | 0 | 0
Investment securities available-for-sale | 13,355 | 14,715
Total | 13,355 | 14,715
Liabilities |  |
Derivatives | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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