LOANS AND ALLOWANCE FOR CREDIT LOSSES - COMPOSITION OF LOANS (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans disclosures
Total loans	$ 4,362,233		$ 4,496,562
Allowance for credit losses	(64,449)	$ (71,656)	(64,577)	$ (60,291)	$ (75,336)	$ (61,067)
Loans, net	4,297,784		4,431,985
Core Banking Activities
Loans disclosures
Total loans	4,270,268		4,352,509
Allowance for credit losses	(51,218)	(51,341)	(51,533)	(51,462)	(51,552)	(52,106)
Traditional Banking
Loans disclosures
Total loans	3,673,590		3,501,959
Allowance for credit losses	(49,727)	(49,616)	(49,407)	(49,362)	(49,387)	(49,699)
Republic Processing Group
Loans disclosures
Total loans	91,965		144,053
Allowance for credit losses	(13,231)	(20,315)	(13,044)	(8,829)	(23,784)	(8,961)
Residential Real Estate | Residential Real Estate - Owner Occupied
Loans disclosures
Total loans	832,137		820,731
Residential Real Estate | Residential Real Estate - Owner Occupied | Traditional Banking
Loans disclosures
Total loans	832,137		820,731
Allowance for credit losses	(8,445)	(8,358)	(8,647)	(8,977)	(9,489)	(9,715)
Residential Real Estate | Residential Real Estate - Non Owner Occupied
Loans disclosures
Total loans	313,534		306,323
Residential Real Estate | Residential Real Estate - Non Owner Occupied | Traditional Banking
Loans disclosures
Total loans	313,534		306,323
Allowance for credit losses	(2,733)	(2,746)	(2,700)	(2,551)	(2,532)	(2,466)
Residential Real Estate | Home equity
Loans disclosures
Total loans	214,069		210,578
Residential Real Estate | Home equity | Traditional Banking
Loans disclosures
Total loans	214,069		210,578
Allowance for credit losses	(4,113)	(4,044)	(4,111)	(4,305)	(4,615)	(4,990)
Commercial Real Estate
Loans disclosures
Total loans	1,569,119		1,456,009
Commercial Real Estate | Traditional Banking
Loans disclosures
Total loans	1,569,119		1,456,009
Allowance for credit losses	(24,341)	(24,624)	(23,769)	(23,307)	(23,801)	(23,606)
Construction & land development
Loans disclosures
Total loans	137,452		129,337
Construction & land development | Traditional Banking
Loans disclosures
Total loans	137,452		129,337
Allowance for credit losses	(3,591)	(3,893)	(4,128)	(3,299)	(3,593)	(3,274)
Commercial | Commercial and Industrial
Loans disclosures
Total loans	394,175		340,363
Commercial | Commercial and Industrial | Traditional Banking
Loans disclosures
Total loans	394,175		340,363
Allowance for credit losses	(3,768)	(3,412)	(3,487)	(4,117)	(2,718)	(2,797)
Commercial | Paycheck Protection Program
Loans disclosures
Total loans	14,657		56,014
Commercial | Paycheck Protection Program | Traditional Banking
Loans disclosures
Total loans	14,657		56,014
Loans, net	15,000		56,000
Lease Financing Receivables
Loans disclosures
Total loans	11,345		8,637
Lease Financing Receivables | Traditional Banking
Loans disclosures
Total loans	11,345		8,637
Allowance for credit losses	(119)	(109)	(91)	(97)	(104)	(106)
Aircraft
Loans disclosures
Total loans	159,958		142,894
Aircraft | Traditional Banking
Loans disclosures
Total loans	159,958		142,894
Allowance for credit losses	(400)	(378)	(357)	(303)	(265)	(253)
Consumer
Loans disclosures
Total loans	27,144		31,073
Consumer | Credit cards | Traditional Banking
Loans disclosures
Total loans	15,419		14,510
Allowance for credit losses	(994)	(944)	(934)	(949)	(930)	(929)
Consumer | Overdrafts | Traditional Banking
Loans disclosures
Total loans	901		683
Allowance for credit losses	(901)	(716)	(683)	(717)	(473)	(587)
Consumer | Automobile loans | Traditional Banking
Loans disclosures
Total loans	9,579		14,448
Allowance for credit losses	(122)	(151)	(186)	(273)	(334)	(399)
Consumer | Other consumer | Traditional Banking
Loans disclosures
Total loans	1,245		1,432
Allowance for credit losses	(200)	(241)	(314)	(467)	(533)	(577)
Warehouse lines of credit
Loans disclosures
Total loans	596,678		850,550
Warehouse lines of credit | Core Banking Activities
Loans disclosures
Total loans	596,678		850,550
Warehouse lines of credit | Warehouse Lending
Loans disclosures
Total loans	596,678
Allowance for credit losses	(1,491)	(1,725)	(2,126)	(2,100)	(2,165)	(2,407)
Tax Refund Solution
Loans disclosures
Total loans	149		50,987
Tax Refund Solution | Easy Advances | Republic Processing Group
Loans disclosures
Allowance for credit losses		(8,315)			(16,019)
Tax Refund Solution | Other TRS loans | Republic Processing Group
Loans disclosures
Total loans	149		50,987
Allowance for credit losses		(55)	(96)		(10)	(158)
Republic Credit Solution
Loans disclosures
Total loans	91,816		93,066
Republic Credit Solution | Republic Processing Group
Loans disclosures
Total loans	91,816		93,066
Allowance for credit losses	$ (13,231)	$ (11,945)	$ (12,948)	$ (8,829)	$ (7,755)	$ (8,803)