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BUSINESS COMBINATIONS - purchased credit impaired loans (Details) - USD ($)
$ in Thousands
Nov. 03, 2017
Oct. 20, 2017
Apr. 07, 2017
Mar. 11, 2016
Total purchased credit-impaired loan acquired     $ 250,876  
Floridian Financial Group [Member]        
Total purchased credit-impaired loan acquired       $ 266,137
Floridian Financial Group [Member] | Purchased Credit Impaired [Member]        
Contractually required principal and interest       8,031
Non-accretable difference       (4,820)
Cash flows expected to be collected       3,211
Accretable yield       (568)
Total purchased credit-impaired loan acquired       $ 2,643
Palm Beach Community Bank [Member]        
Total purchased credit-impaired loan acquired $ 272,090      
Palm Beach Community Bank [Member] | Purchased Credit Impaired [Member]        
Total purchased credit-impaired loan acquired 3,766      
Palm Beach Community Bank [Member] | Purchased Impaired Loans [Member]        
Contractually required principal and interest 4,768      
Non-accretable difference (1,002)      
Cash flows expected to be collected 3,766      
Accretable yield 0      
Total purchased credit-impaired loan acquired $ 3,766      
NorthStar Bank [Member]        
Total purchased credit-impaired loan acquired   $ 136,832    
NorthStar Bank [Member] | Purchased Credit Impaired [Member]        
Total purchased credit-impaired loan acquired   4,293    
NorthStar Bank [Member] | Purchased Impaired Loans [Member]        
Contractually required principal and interest   5,596    
Non-accretable difference   (689)    
Cash flows expected to be collected   4,907    
Accretable yield   (614)    
Total purchased credit-impaired loan acquired   $ 4,293