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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Branch Sales (Details)
$ in Thousands
12 Months Ended
Sep. 25, 2015
USD ($)
Branch
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Branch
Business Acquisition [Line Items]        
Number of branches agreed to sell | Branch       2
Liabilities of discontinued operations   $ 7,819 $ 34,480  
Gain on sale of branches   0 0 $ 163
Proceeds from sale of loans held-for-investment   605,502 930,342 575,477
Net gain on sale of loans   $ 11,942 $ 35,895 37,211
Americas United Bank (AUB)        
Business Acquisition [Line Items]        
Number of branches agreed to sell | Branch 2      
Liabilities of discontinued operations $ 46,900      
Proceeds from sale of loans held-for-investment 40,200     $ 40,200
Americas United Bank (AUB) | Other Income        
Business Acquisition [Line Items]        
Gain on sale of branches 163      
Americas United Bank (AUB) | Net Gain on Sale of Loans        
Business Acquisition [Line Items]        
Net gain on sale of loans $ 644