LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - DELINQUENT LOANS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Aging or recorded investments in loans
Total Loans Delinquent	$ 20,804	$ 15,962
Total Loans Not Delinquent	4,412,347	4,132,265
Carrying value of loans	$ 4,433,151	$ 4,148,227
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.47%	0.38%
30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 10,090	$ 8,623
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.23%	0.21%
60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 3,063	$ 2,053
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.07%	0.05%
90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 7,651	$ 5,286
Delinquent acquired bank loans to total acquired bank loans (as a percent)	0.17%	0.13%
Core Banking Activities
Aging or recorded investments in loans
Total Loans Delinquent	$ 13,042	$ 8,875
Total Loans Not Delinquent	4,300,347	4,036,864
Carrying value of loans	4,313,389	4,045,739
Core Banking Activities | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,001	2,887
Core Banking Activities | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,547	834
Core Banking Activities | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	7,494	5,154
Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	13,042	8,875
Total Loans Not Delinquent	3,582,889	3,568,169
Carrying value of loans	3,595,931	3,577,044
Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4,001	2,887
Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,547	834
Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	7,494	5,154
Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	7,762	7,087
Total Loans Not Delinquent	112,000	95,401
Carrying value of loans	119,762	102,488
Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	6,089	5,736
Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,516	1,219
Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	157	132
Residential Real Estate - Owner Occupied
Aging or recorded investments in loans
Carrying value of loans	949,568	1,001,832
Residential Real Estate - Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	4,434	5,525
Total Loans Not Delinquent	945,134	996,307
Carrying value of loans	949,568	1,001,832
Residential Real Estate - Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,460	1,137
Residential Real Estate - Owner Occupied | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,153	748
Residential Real Estate - Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,821	3,640
Residential Real Estate - Non Owner Occupied
Aging or recorded investments in loans
Carrying value of loans	258,803	242,846
Residential Real Estate - Non Owner Occupied | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	539	1,008
Total Loans Not Delinquent	258,264	241,838
Carrying value of loans	258,803	242,846
Residential Real Estate - Non Owner Occupied | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		349
Residential Real Estate - Non Owner Occupied | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	539	659
Commercial Real Estate | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	3,300	1,099
Total Loans Not Delinquent	1,299,700	1,247,841
Carrying value of loans	1,303,000	1,248,940
Commercial Real Estate | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	155	511
Commercial Real Estate | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	3,145	588
Construction & land development | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	159,702	175,178
Carrying value of loans	159,702	175,178
Commercial & industrial | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	1,355	25
Total Loans Not Delinquent	475,881	430,330
Carrying value of loans	477,236	430,355
Commercial & industrial | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	200
Commercial & industrial | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	128
Commercial & industrial | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,027	25
Lease Financing Receivables | Traditional Banking
Aging or recorded investments in loans
Total Loans Not Delinquent	14,040	15,031
Carrying value of loans	14,040	15,031
Home equity lines of credit
Aging or recorded investments in loans
Carrying value of loans	293,186	332,548
Home equity lines of credit | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	2,918	784
Total Loans Not Delinquent	290,268	331,764
Carrying value of loans	293,186	332,548
Home equity lines of credit | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,810	558
Home equity lines of credit | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	166
Home equity lines of credit | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	942	226
Consumer: Credit cards
Aging or recorded investments in loans
Carrying value of loans	17,836	19,095
Consumer: Credit cards | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	155	129
Total Loans Not Delinquent	17,681	18,966
Carrying value of loans	17,836	19,095
Consumer: Credit cards | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	80	82
Consumer: Credit cards | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	75	46
Consumer: Credit cards | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent		1
Consumer: Overdrafts
Aging or recorded investments in loans
Carrying value of loans	1,522	1,102
Consumer: Overdrafts | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	283	230
Total Loans Not Delinquent	1,239	872
Carrying value of loans	1,522	1,102
Consumer: Overdrafts | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	278	223
Consumer: Overdrafts | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	4	5
Consumer: Overdrafts | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1	2
Consumer: Automobile loan
Aging or recorded investments in loans
Carrying value of loans	52,923	63,475
Consumer: Automobile loan | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	49	28
Total Loans Not Delinquent	52,874	63,447
Carrying value of loans	52,923	63,475
Consumer: Automobile loan | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	16
Consumer: Automobile loan | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	15	28
Consumer: Automobile loan | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	18
Other consumer
Aging or recorded investments in loans
Carrying value of loans	68,115	46,642
Other consumer | Traditional Banking
Aging or recorded investments in loans
Total Loans Delinquent	9	47
Total Loans Not Delinquent	68,106	46,595
Carrying value of loans	68,115	46,642
Other consumer | Traditional Banking | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	2	27
Other consumer | Traditional Banking | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	6	7
Other consumer | Traditional Banking | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1	13
Warehouse lines of credit | Warehouse Lending
Aging or recorded investments in loans
Total Loans Not Delinquent	717,458	468,695
Carrying value of loans	717,458	468,695
Other TRS loans | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	119	10
Total Loans Not Delinquent	14,246	13,734
Carrying value of loans	14,365	13,744
Other TRS loans | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	35	2
Other TRS loans | Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	31	4
Other TRS loans | Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	53	4
Republic Credit Solutions
Aging or recorded investments in loans
Carrying value of loans	105,397	88,744
Republic Credit Solutions | Republic Processing Group
Aging or recorded investments in loans
Total Loans Delinquent	7,643	7,077
Total Loans Not Delinquent	97,754	81,667
Carrying value of loans	105,397	88,744
Republic Credit Solutions | Republic Processing Group | 30 - 59 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	6,054	5,734
Republic Credit Solutions | Republic Processing Group | 60 - 89 Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	1,485	1,215
Republic Credit Solutions | Republic Processing Group | 90 + Days Delinquent
Aging or recorded investments in loans
Total Loans Delinquent	$ 104	$ 128