REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue recognition
Net interest income	$ 68,536	$ 64,529	$ 165,455	$ 157,171
NONINTEREST INCOME:
Mortgage banking income	1,612	907	1,922	1,707
Program fees	4,398	3,739	8,577	6,980
Increase in cash surrender value of BOLI	792	689	1,546	1,324
Death benefits in excess of cash surrender value of life insurance		1,728		1,728
Total noninterest income	18,346	19,651	41,719	42,332
Total net revenue	$ 86,882	$ 84,180	$ 207,174	$ 199,503
Net-revenue concentration (as percent)	100.00%	100.00%	100.00%	100.00%
Writedowns during entity's holding of property (as a percent)			10.00%
Core Banking Activities
Revenue recognition
Net interest income	$ 52,829	$ 51,385	$ 103,345	$ 103,640
NONINTEREST INCOME:
Mortgage banking income	1,612	907	1,922	1,707
Increase in cash surrender value of BOLI	792	689	1,546	1,324
Death benefits in excess of cash surrender value of life insurance		1,728		1,728
Total noninterest income	10,060	11,275	18,369	19,757
Total net revenue	$ 62,889	$ 62,660	$ 121,714	$ 123,397
Net-revenue concentration (as percent)	73.00%	74.00%	59.00%	62.00%
Traditional Banking
Revenue recognition
Net interest income	$ 49,915	$ 48,743	$ 98,174	$ 98,911
NONINTEREST INCOME:
Mortgage banking income	1,612	907	1,922	1,707
Increase in cash surrender value of BOLI	792	689	1,546	1,324
Death benefits in excess of cash surrender value of life insurance		1,728		1,728
Total noninterest income	10,047	11,264	18,343	19,735
Total net revenue	$ 59,962	$ 60,007	$ 116,517	$ 118,646
Net-revenue concentration (as percent)	70.00%	71.00%	56.00%	60.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 2,914	$ 2,642	$ 5,171	$ 4,729
NONINTEREST INCOME:
Total noninterest income	13	11	26	22
Total net revenue	$ 2,927	$ 2,653	$ 5,197	$ 4,751
Net-revenue concentration (as percent)	3.00%	3.00%	3.00%	2.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 15,707	$ 13,144	$ 62,110	$ 53,531
NONINTEREST INCOME:
Program fees	4,398	3,739	8,577	6,980
Total noninterest income	8,286	8,376	23,350	22,575
Total net revenue	$ 23,993	$ 21,520	$ 85,460	$ 76,106
Net-revenue concentration (as percent)	27.00%	26.00%	41.00%	38.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 823	$ 70	$ 31,733	$ 28,377
NONINTEREST INCOME:
Total noninterest income	3,886	4,606	14,769	15,528
Total net revenue	$ 4,709	$ 4,676	$ 46,502	$ 43,905
Net-revenue concentration (as percent)	5.00%	6.00%	22.00%	22.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 2,930	$ 3,940	$ 6,438	$ 7,398
NONINTEREST INCOME:
Program fees	760	728	1,533	1,435
Total noninterest income	761	719	1,535	1,437
Total net revenue	$ 3,691	$ 4,659	$ 7,973	$ 8,835
Net-revenue concentration (as percent)	4.00%	6.00%	4.00%	4.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 11,954	$ 9,134	$ 23,939	$ 17,756
NONINTEREST INCOME:
Program fees	3,638	3,011	7,044	5,545
Total noninterest income	3,639	3,051	7,046	5,610
Total net revenue	$ 15,593	$ 12,185	$ 30,985	$ 23,366
Net-revenue concentration (as percent)	18.00%	14.00%	15.00%	12.00%
Service charges on deposit accounts
NONINTEREST INCOME:
Revenue under 606	$ 3,526	$ 3,527	$ 6,839	$ 6,826
Service charges on deposit accounts \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	3,526	3,527	6,838	6,826
Service charges on deposit accounts \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	3,513	3,516	6,812	6,804
Service charges on deposit accounts \| Warehouse Lending
NONINTEREST INCOME:
Revenue under 606	13	11	26	22
Service charges on deposit accounts \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606			1
Service charges on deposit accounts \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606			1
Net refund transfer fees
NONINTEREST INCOME:
Revenue under 606	3,811	4,479	14,631	15,286
Net refund transfer fees \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	3,811	4,479	14,631	15,286
Net refund transfer fees \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	3,811	4,479	14,631	15,286
Interchange fee income
NONINTEREST INCOME:
Revenue under 606	3,351	3,419	6,508	6,470
Interchange fee income \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	3,313	3,375	6,430	6,381
Interchange fee income \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	3,313	3,375	6,430	6,381
Interchange fee income \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	38	44	78	89
Interchange fee income \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	36	43	75	87
Interchange fee income \| Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606	1	1	2	2
Interchange fee income \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606	1		1
Net losses on other real estate owned
NONINTEREST INCOME:
Revenue under 606	(48)	(52)	(101)	(105)
Net losses on other real estate owned \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	(48)	(52)	(101)	(105)
Net losses on other real estate owned \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	(48)	(52)	(101)	(105)
Contract termination fee
NONINTEREST INCOME:
Death benefits in excess of cash surrender value of life insurance		1,728		1,728
Other
NONINTEREST INCOME:
Revenue under 606	904	1,215	1,797	2,116
Other \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	865	1,101	1,734	1,896
Other \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	865	1,101	1,734	1,896
Other \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	39	114	63	220
Other \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	$ 39	84	$ 63	155
Other \| Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606		(10)
Other \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606		$ 40		$ 65

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