LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - DELINQUENT LOANS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Aging or recorded investments in loans
Total Loans Delinquent	$ 12,026	$ 8,958
Total Loans Not Delinquent	3,945,486	3,801,820
Carrying value of loans	$ 3,957,512	$ 3,810,778
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.30%	0.24%
30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 5,409	$ 4,400
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.14%	0.12%
60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 1,738	$ 912
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.04%	0.02%
90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 4,879	$ 3,646
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.12%	0.10%
Core Banking Activities
Aging or recorded investments in loans
Total Loans Delinquent	$ 7,756	$ 6,821
Total Loans Not Delinquent	3,902,625	3,765,010
Carrying value of loans	3,910,381	3,771,831
Core Banking Activities | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,616	2,649
Core Banking Activities | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,112	608
Core Banking Activities | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,028	3,564
Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	7,756	6,821
Total Loans Not Delinquent	3,331,465	3,179,571
Carrying value of loans	3,339,221	3,186,392
Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,616	2,649
Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,112	608
Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,028	3,564
Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	4,270	2,137
Total Loans Not Delinquent	42,861	36,810
Carrying value of loans	47,131	38,947
Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,793	1,751
Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	626	304
Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	851	82
Residential Real Estate - Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	3,579	4,554
Total Loans Not Delinquent	930,147	995,594
Carrying value of loans	933,726	1,000,148
Residential Real Estate - Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,422	1,696
Residential Real Estate - Owner Occupied | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	442	337
Residential Real Estate - Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,715	2,521
Residential Real Estate - Owner Occupied - Correspondent | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	125,643	149,028
Carrying value of loans	125,643	149,028
Residential Real Estate - Non Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	658	46
Total Loans Not Delinquent	192,721	156,559
Carrying value of loans	193,379	156,605
Residential Real Estate - Non Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	658
Residential Real Estate - Non Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		46
Commercial Real Estate | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	2,087	425
Total Loans Not Delinquent	1,159,138	1,060,071
Carrying value of loans	1,161,225	1,060,496
Commercial Real Estate | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		8
Commercial Real Estate | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	379
Commercial Real Estate | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,708	417
Construction & land development | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	138,837	119,650
Carrying value of loans	138,837	119,650
Commercial & Industrial | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	37	342
Total Loans Not Delinquent	327,177	258,684
Carrying value of loans	327,214	259,026
Commercial & Industrial | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	37	342
Commercial & Industrial | Republic Processing Group
Aging or recorded investments in loans
Total Loans Not Delinquent	265	6,695
Carrying value of loans	265	6,695
Lease Financing Receivables | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	15,367	13,614
Carrying value of loans	15,367	13,614
Home equity lines of credit | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	837	970
Total Loans Not Delinquent	345,317	340,315
Carrying value of loans	346,154	341,285
Home equity lines of credit | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	130	316
Home equity lines of credit | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	181	160
Home equity lines of credit | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	526	494
Consumer: Credit cards | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	96	18
Total Loans Not Delinquent	19,802	13,396
Carrying value of loans	19,898	13,414
Consumer: Credit cards | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	56	14
Consumer: Credit cards | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	40	4
Consumer: Overdrafts | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	209	161
Total Loans Not Delinquent	683	642
Carrying value of loans	892	803
Consumer: Overdrafts | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	208	159
Consumer: Overdrafts | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1	1
Consumer: Overdrafts | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		1
Consumer: Automobile loan | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	73
Total Loans Not Delinquent	63,566	52,579
Carrying value of loans	63,639	52,579
Consumer: Automobile loan | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	23
Consumer: Automobile loan | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	25
Consumer: Automobile loan | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	25
Other consumer | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	180	305
Total Loans Not Delinquent	13,067	19,439
Carrying value of loans	13,247	19,744
Other consumer | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	82	114
Other consumer | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	44	106
Other consumer | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	54	85
Warehouse lines of credit | Warehouse Lending
Aging or recorded investments in loans
Total Loans Not Delinquent	571,160	585,439
Carrying value of loans	571,160	585,439
Republic Credit Solutions | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	4,270	2,137
Total Loans Not Delinquent	42,596	30,115
Carrying value of loans	46,866	32,252
Republic Credit Solutions | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,793	1,751
Republic Credit Solutions | Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	626	304
Republic Credit Solutions | Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 851	$ 82