LOANS AND ALLOWANCE FOR CREDIT LOSSES - DELINQUENT LOANS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Aging or recorded investments in loans
Total Loans Delinquent	$ 42,627	$ 20,804
Total Loans Not Delinquent	4,472,972	4,412,347
Carrying value of loans	$ 4,515,599	$ 4,433,151
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.94%	0.47%
30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 33,438	$ 10,090
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.74%	0.23%
60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 1,762	$ 3,063
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.04%	0.07%
90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 7,427	$ 7,651
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.16%	0.17%
Core Banking Activities
Aging or recorded investments in loans
Total Loans Delinquent	$ 11,863	$ 13,042
Total Loans Not Delinquent	4,375,395	4,300,347
Carrying value of loans	4,387,258	4,313,389
Core Banking Activities | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,436	4,001
Core Banking Activities | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	495	1,547
Core Banking Activities | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	6,932	7,494
Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	11,863	13,042
Total Loans Not Delinquent	3,524,941	3,582,889
Carrying value of loans	3,536,804	3,595,931
Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,436	4,001
Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	495	1,547
Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	6,932	7,494
Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	30,764	7,762
Total Loans Not Delinquent	97,577	112,000
Carrying value of loans	128,341	119,762
Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	29,002	6,089
Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,267	1,516
Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	495	157
Residential Real Estate - Owner Occupied
Aging or recorded investments in loans
Carrying value of loans	916,526
Residential Real Estate - Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	3,682	4,434
Total Loans Not Delinquent	912,844	945,134
Carrying value of loans	916,526	949,568
Residential Real Estate - Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,112	1,460
Residential Real Estate - Owner Occupied | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	363	1,153
Residential Real Estate - Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,207	1,821
Residential Real Estate - Non Owner Occupied
Aging or recorded investments in loans
Carrying value of loans	256,492
Residential Real Estate - Non Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	898	539
Total Loans Not Delinquent	255,594	258,264
Carrying value of loans	256,492	258,803
Residential Real Estate - Non Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	359
Residential Real Estate - Non Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	539	539
Commercial Real Estate
Aging or recorded investments in loans
Carrying value of loans	1,320,790
Commercial Real Estate | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	3,734	3,300
Total Loans Not Delinquent	1,317,056	1,299,700
Carrying value of loans	1,320,790	1,303,000
Commercial Real Estate | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,245	155
Commercial Real Estate | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2,489	3,145
Construction & land development
Aging or recorded investments in loans
Carrying value of loans	163,396
Construction & land development | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	295
Total Loans Not Delinquent	163,101	159,702
Carrying value of loans	163,396	159,702
Construction & land development | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	295
Commercial & industrial
Aging or recorded investments in loans
Carrying value of loans	445,947
Commercial & industrial | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	1,240	1,355
Total Loans Not Delinquent	444,707	475,881
Carrying value of loans	445,947	477,236
Commercial & industrial | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	159	200
Commercial & industrial | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	31	128
Commercial & industrial | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,050	1,027
Lease Financing Receivables
Aging or recorded investments in loans
Carrying value of loans	12,676
Lease Financing Receivables | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	12,676	14,040
Carrying value of loans	12,676	14,040
Home equity lines of credit
Aging or recorded investments in loans
Carrying value of loans	282,809
Home equity lines of credit | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	1,680	2,918
Total Loans Not Delinquent	281,129	290,268
Carrying value of loans	282,809	293,186
Home equity lines of credit | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,011	1,810
Home equity lines of credit | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	43	166
Home equity lines of credit | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	626	942
Consumer: Credit cards | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	97	155
Total Loans Not Delinquent	15,511	17,681
Carrying value of loans	15,608	17,836
Consumer: Credit cards | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	53	80
Consumer: Credit cards | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	44	75
Consumer: Overdrafts | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	172	283
Total Loans Not Delinquent	586	1,239
Carrying value of loans	758	1,522
Consumer: Overdrafts | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	168	278
Consumer: Overdrafts | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	3	4
Consumer: Overdrafts | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1	1
Consumer: Automobile loan | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	47	49
Total Loans Not Delinquent	46,790	52,874
Carrying value of loans	46,837	52,923
Consumer: Automobile loan | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	27	16
Consumer: Automobile loan | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		15
Consumer: Automobile loan | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	20	18
Consumer
Aging or recorded investments in loans
Carrying value of loans	138,168
Other consumer | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	18	9
Total Loans Not Delinquent	74,947	68,106
Carrying value of loans	74,965	68,115
Other consumer | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	7	2
Other consumer | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	11	6
Other consumer | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		1
Warehouse lines of credit
Aging or recorded investments in loans
Carrying value of loans	850,454
Warehouse lines of credit | Core Banking Activities
Aging or recorded investments in loans
Total Loans Not Delinquent	850,454	717,458
Carrying value of loans	850,454	717,458
Easy Advances | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	23,467
Total Loans Not Delinquent	2,775
Carrying value of loans	26,242
Easy Advances | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	23,467
Other TRS loans
Aging or recorded investments in loans
Carrying value of loans	26,615
Other TRS loans | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	235	119
Total Loans Not Delinquent	138	14,246
Carrying value of loans	373	14,365
Other TRS loans | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	27	35
Other TRS loans | Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	19	31
Other TRS loans | Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	189	53
Republic Credit Solutions
Aging or recorded investments in loans
Carrying value of loans	101,726
Republic Credit Solutions | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	7,062	7,643
Total Loans Not Delinquent	94,664	97,754
Carrying value of loans	101,726	105,397
Republic Credit Solutions | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	5,508	6,054
Republic Credit Solutions | Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,248	1,485
Republic Credit Solutions | Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 306	$ 104