LOANS AND ALLOWANCE FOR CREDIT LOSSES - COMPOSITION OF LOANS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans disclosures
Total loans	$ 4,515,599	$ 4,433,151
Allowance for loan and lease losses	(70,431)	(43,351)	$ (57,961)	$ (44,675)
Loans, net	4,445,168	4,389,800
Core Banking Activities
Loans disclosures
Total loans	4,387,258	4,313,389
Allowance for loan and lease losses	(42,680)	(29,999)	(31,569)	(31,519)
Traditional Banking
Loans disclosures
Total loans	3,536,804	3,595,931
Allowance for loan and lease losses	(40,554)	(28,205)	(30,172)	(30,347)
Republic Processing Group
Loans disclosures
Total loans	128,341	119,762
Allowance for loan and lease losses	(27,751)	(13,352)	(26,392)	(13,156)
Residential Real Estate - Owner Occupied
Loans disclosures
Total loans	916,526
Residential Real Estate - Owner Occupied | Traditional Banking
Loans disclosures
Total loans	916,526	949,568
Allowance for loan and lease losses	(9,387)	(4,729)	(5,801)	(6,035)
Residential Real Estate - Non Owner Occupied
Loans disclosures
Total loans	256,492
Residential Real Estate - Non Owner Occupied | Traditional Banking
Loans disclosures
Total loans	256,492	258,803
Allowance for loan and lease losses	(2,165)	(1,737)	(1,720)	(1,662)
Commercial Real Estate
Loans disclosures
Total loans	1,320,790
Commercial Real Estate | Traditional Banking
Loans disclosures
Total loans	1,320,790	1,303,000
Allowance for loan and lease losses	(13,381)	(10,486)	(10,235)	(10,030)
Construction & land development
Loans disclosures
Total loans	163,396
Construction & land development | Traditional Banking
Loans disclosures
Total loans	163,396	159,702
Allowance for loan and lease losses	(4,536)	(2,152)	(2,443)	(2,555)
Commercial & industrial
Loans disclosures
Total loans	445,947
Commercial & industrial | Traditional Banking
Loans disclosures
Total loans	445,947	477,236
Allowance for loan and lease losses	(2,541)	(2,882)	(3,235)	(2,873)
Lease Financing Receivables
Loans disclosures
Total loans	12,676
Lease Financing Receivables | Traditional Banking
Loans disclosures
Total loans	12,676	14,040
Allowance for loan and lease losses	(133)	(147)	(150)	(158)
Home equity lines of credit
Loans disclosures
Total loans	282,809
Home equity lines of credit | Traditional Banking
Loans disclosures
Total loans	282,809	293,186
Allowance for loan and lease losses	(5,290)	(2,721)	(3,337)	(3,477)
Consumer: Credit cards | Traditional Banking
Loans disclosures
Total loans	15,608	17,836
Allowance for loan and lease losses	(978)	(1,020)	(1,079)	(1,140)
Consumer: Overdrafts | Traditional Banking
Loans disclosures
Total loans	758	1,522
Allowance for loan and lease losses	(758)	(1,169)	(892)	(1,102)
Consumer: Automobile loan | Traditional Banking
Loans disclosures
Total loans	46,837	52,923
Allowance for loan and lease losses	(546)	(612)	(768)	(724)
Consumer
Loans disclosures
Total loans	138,168
Other consumer | Traditional Banking
Loans disclosures
Total loans	74,965	68,115
Allowance for loan and lease losses	(839)	(550)	(512)	(591)
Warehouse lines of credit
Loans disclosures
Total loans	850,454
Warehouse lines of credit | Core Banking Activities
Loans disclosures
Total loans	850,454	717,458
Allowance for loan and lease losses	(2,126)	(1,794)	(1,397)	(1,172)
Easy Advances | Republic Processing Group
Loans disclosures
Total loans	26,242
Allowance for loan and lease losses	(15,270)		(13,381)
Other TRS loans
Loans disclosures
Total loans	26,615
Other TRS loans | Republic Processing Group
Loans disclosures
Total loans	373	14,365
Allowance for loan and lease losses	(95)	(234)	(149)	(107)
Republic Credit Solutions
Loans disclosures
Total loans	101,726
Republic Credit Solutions | Republic Processing Group
Loans disclosures
Total loans	101,726	105,397
Allowance for loan and lease losses	$ (12,386)	$ (13,118)	$ (12,862)	$ (13,049)