LOANS AND ALLOWANCE FOR CREDIT LOSSES - COMPOSITION OF LOANS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans disclosures
Total Loans	$ 11,333		$ 8,637
Loans	4,289,450		4,496,562
Allowance for credit losses	(64,919)	$ (64,449)	(64,577)	$ (63,024)	$ (60,291)	$ (61,067)
Loans, net	4,224,531		4,431,985
Core Banking Activities
Loans disclosures
Loans	4,190,178		4,352,509
Allowance for credit losses	(50,336)	(51,218)	(51,533)	(51,364)	(51,462)	(52,106)
Traditional Banking
Loans disclosures
Total Loans	11,333		8,637
Loans	3,747,940		3,501,959
Allowance for credit losses	(49,231)	$ (49,727)	(49,407)	$ (49,487)	$ (49,362)	$ (49,699)
Republic Processing Group
Loans disclosures
Total loans	99,272		144,053
Residential Real Estate | Residential Real Estate - Owner Occupied
Loans disclosures
Total loans	863,899		820,731
Residential Real Estate | Residential Real Estate - Owner Occupied | Traditional Banking
Loans disclosures
Total loans	863,899		820,731
Residential Real Estate | Residential Real Estate - Non Owner Occupied
Loans disclosures
Total loans	321,037		306,323
Residential Real Estate | Residential Real Estate - Non Owner Occupied | Traditional Banking
Loans disclosures
Total loans	321,037		306,323
Residential Real Estate | Home equity
Loans disclosures
Total loans	229,038		210,578
Residential Real Estate | Home equity | Traditional Banking
Loans disclosures
Total loans	229,038		210,578
Commercial Real Estate
Loans disclosures
Total loans	1,571,593		1,456,009
Commercial Real Estate | Traditional Banking
Loans disclosures
Total loans	1,571,593		1,456,009
Construction & land development
Loans disclosures
Total loans	147,418		129,337
Construction & land development | Traditional Banking
Loans disclosures
Total loans	147,418		129,337
Commercial | Commercial and Industrial
Loans disclosures
Total loans	404,971		340,363
Commercial | Commercial and Industrial | Traditional Banking
Loans disclosures
Total loans	404,971		340,363
Commercial | Paycheck Protection Program
Loans disclosures
Total loans	7,855		56,014
Commercial | Paycheck Protection Program | Traditional Banking
Loans disclosures
Total loans	7,855		56,014
Loans, net	8,000		56,000
Aircraft
Loans disclosures
Total loans	166,313		142,894
Aircraft | Traditional Banking
Loans disclosures
Total loans	166,313		142,894
Consumer
Loans disclosures
Total loans	24,483		31,073
Consumer | Credit cards | Traditional Banking
Loans disclosures
Total loans	14,897		14,510
Consumer | Overdrafts | Traditional Banking
Loans disclosures
Total loans	723		683
Consumer | Automobile loans | Traditional Banking
Loans disclosures
Total loans	7,890		14,448
Consumer | Other consumer | Traditional Banking
Loans disclosures
Total loans	973		1,432
Warehouse lines of credit
Loans disclosures
Total loans	442,238		850,550
Warehouse lines of credit | Core Banking Activities
Loans disclosures
Total loans	442,238		850,550
Warehouse lines of credit | Warehouse Lending
Loans disclosures
Total loans	442,238
Tax Refund Solution
Loans disclosures
Total loans	295		50,987
Tax Refund Solution | Other TRS loans | Republic Processing Group
Loans disclosures
Total loans	295		50,987
Republic Credit Solution
Loans disclosures
Total loans	98,977		93,066
Republic Credit Solution | Republic Processing Group
Loans disclosures
Total loans	$ 98,977		$ 93,066