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FAIR VALUE DISCLOSURES - Certain assets measured on a non recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired loans |  |
Total impaired loans | $ 2,286,766 | $ 2,129,879
Non-recurring basis |  |
Impaired loans |  |
Total impaired loans | 2,698 | 5,425
Non-recurring basis | Commercial and industrial |  |
Impaired loans |  |
Total impaired loans | 340 | 3,765
Non-recurring basis | Commercial real estate |  |
Impaired loans |  |
Total impaired loans | 603 | 1,660
Non-recurring basis | One to four family residential |  |
Impaired loans |  |
Total impaired loans | 1,755 |
Level 3 Inputs | Non-recurring basis |  |
Impaired loans |  |
Total impaired loans | 2,698 | 5,425
Level 3 Inputs | Non-recurring basis | Commercial and industrial |  |
Impaired loans |  |
Total impaired loans | 340 | 3,765
Level 3 Inputs | Non-recurring basis | Commercial real estate |  |
Impaired loans |  |
Total impaired loans | 603 | $ 1,660
Level 3 Inputs | Non-recurring basis | One to four family residential |  |
Impaired loans |  |
Total impaired loans | $ 1,755 |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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