BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - OPERATIONS (Details)	9 Months Ended
	Sep. 30, 2017 segment item
Basis of Presentation
Number of reportable segments | segment	5
Number of banking centers	45
Number of loan production offices	1
Kentucky
Basis of Presentation
Number of banking centers	33
Metropolitan Louisville
Basis of Presentation
Number of banking centers	19
Central Kentucky
Basis of Presentation
Number of banking centers	9
Elizabethtown
Basis of Presentation
Number of banking centers	1
Frankfort
Basis of Presentation
Number of banking centers	1
Georgetown
Basis of Presentation
Number of banking centers	1
Lexington
Basis of Presentation
Number of banking centers	5
Shelbyville
Basis of Presentation
Number of banking centers	1
Western Kentucky
Basis of Presentation
Number of banking centers	2
Owensboro
Basis of Presentation
Number of banking centers	2
Northern Kentucky
Basis of Presentation
Number of banking centers	3
Covington
Basis of Presentation
Number of banking centers	1
Florence
Basis of Presentation
Number of banking centers	1
Independence
Basis of Presentation
Number of banking centers	1
Southern Indiana
Basis of Presentation
Number of banking centers	3
Floyds Knobs
Basis of Presentation
Number of banking centers	1
Jeffersonville
Basis of Presentation
Number of banking centers	1
New Albany
Basis of Presentation
Number of banking centers	1
Metropolitan Tampa, Florida
Basis of Presentation
Number of banking centers	6
Metropolitan Cincinnati, Ohio
Basis of Presentation
Number of banking centers	1
Metropolitan Nashville, Tennessee
Basis of Presentation
Number of banking centers	3
Core Banking Activities
Basis of Presentation
Number of reportable segments | segment	3
Core Banking Activities | Minimum
Basis of Presentation
Period of loan expected to remain in warehouse line	15 days
Core Banking Activities | Maximum
Basis of Presentation
Period of loan expected to remain in warehouse line	30 days
Republic Processing Group
Basis of Presentation
Number of reportable segments | segment	2