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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