REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue recognition
Net interest income	$ 71,305	$ 64,825	$ 236,760	$ 221,996
NONINTEREST INCOME:
Mortgage banking income	2,062	852	3,984	2,559
Program fees	4,962	4,041	13,539	11,021
Increase in cash surrender value of BOLI	826	690	2,372	2,014
Death benefits in excess of cash surrender value of life insurance				1,728
Total noninterest income	16,813	14,345	58,532	56,677
Total net revenue	$ 88,118	$ 79,170	$ 295,292	$ 278,673
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	$ 54,603	$ 49,960	$ 157,948	$ 153,600
NONINTEREST INCOME:
Mortgage banking income	2,062	852	3,984	2,559
Increase in cash surrender value of BOLI	826	690	2,372	2,014
Death benefits in excess of cash surrender value of life insurance				1,728
Total noninterest income	11,094	9,952	29,463	29,709
Total net revenue	$ 65,697	$ 59,912	$ 187,411	$ 183,309
Net-revenue concentration (as percent)	75.00%	76.00%	64.00%	66.00%
Traditional Banking
Revenue recognition
Net interest income	$ 51,023	$ 47,493	$ 149,197	$ 146,404
NONINTEREST INCOME:
Mortgage banking income	2,062	852	3,984	2,559
Increase in cash surrender value of BOLI	826	690	2,372	2,014
Death benefits in excess of cash surrender value of life insurance				1,728
Total noninterest income	11,078	9,941	29,421	29,676
Total net revenue	$ 62,101	$ 57,434	$ 178,618	$ 176,080
Net-revenue concentration (as percent)	71.00%	73.00%	61.00%	63.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 3,580	$ 2,467	$ 8,751	$ 7,196
NONINTEREST INCOME:
Total noninterest income	16	11	42	33
Total net revenue	$ 3,596	$ 2,478	$ 8,793	$ 7,229
Net-revenue concentration (as percent)	4.00%	3.00%	3.00%	3.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 16,702	$ 14,865	$ 78,812	$ 68,396
NONINTEREST INCOME:
Program fees	4,962	4,041	13,539	11,021
Total noninterest income	5,719	4,393	29,069	26,968
Total net revenue	$ 22,421	$ 19,258	$ 107,881	$ 95,364
Net-revenue concentration (as percent)	25.00%	24.00%	36.00%	34.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 440	$ 401	$ 32,173	$ 28,778
NONINTEREST INCOME:
Total noninterest income	609	314	15,378	15,842
Total net revenue	$ 1,049	$ 715	$ 47,551	$ 44,620
Net-revenue concentration (as percent)	1.00%	1.00%	16.00%	16.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 2,783	$ 4,124	$ 9,221	$ 11,522
NONINTEREST INCOME:
Program fees	786	705	2,319	2,140
Total noninterest income	933	715	2,468	2,152
Total net revenue	$ 3,716	$ 4,839	$ 11,689	$ 13,674
Net-revenue concentration (as percent)	4.00%	6.00%	4.00%	5.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 13,479	$ 10,340	$ 37,418	$ 28,096
NONINTEREST INCOME:
Program fees	4,176	3,336	11,220	8,881
Total noninterest income	4,177	3,364	11,223	8,974
Total net revenue	$ 17,656	$ 13,704	$ 48,641	$ 37,070
Net-revenue concentration (as percent)	20.00%	17.00%	16.00%	13.00%
Service charges on deposit accounts
NONINTEREST INCOME:
Revenue under 606	$ 3,693	$ 3,559	$ 10,532	$ 10,385
Service charges on deposit accounts \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	3,692	3,558	10,530	10,384
Service charges on deposit accounts \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	3,676	3,547	10,488	10,351
Service charges on deposit accounts \| Warehouse Lending
NONINTEREST INCOME:
Revenue under 606	16	11	42	33
Service charges on deposit accounts \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	1	1	2	1
Service charges on deposit accounts \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606	1	1	2	1
Net refund transfer fees
NONINTEREST INCOME:
Revenue under 606	582	242	15,213	15,528
Net refund transfer fees \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	582	242	15,213	15,528
Net refund transfer fees \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	582	242	15,213	15,528
Interchange fee income
NONINTEREST INCOME:
Revenue under 606	3,286	3,282	9,794	9,752
Interchange fee income \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	3,267	3,258	9,697	9,639
Interchange fee income \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	3,267	3,258	9,697	9,639
Interchange fee income \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	19	24	97	113
Interchange fee income \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	19	22	94	109
Interchange fee income \| Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606		1	2	3
Interchange fee income \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606		1	1	1
Net losses on other real estate owned
NONINTEREST INCOME:
Revenue under 606	(53)	(53)	(154)	(158)
Net losses on other real estate owned \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	(53)	(53)	(154)	(158)
Net losses on other real estate owned \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	(53)	(53)	(154)	(158)
Other
NONINTEREST INCOME:
Revenue under 606	1,455	1,732	3,252	3,848
Other \| Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	1,300	1,647	3,034	3,543
Other \| Traditional Banking
NONINTEREST INCOME:
Revenue under 606	1,300	1,647	3,034	3,543
Other \| Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	155	85	218	305
Other \| Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	8	50	71	205
Other \| Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606	$ 147	9	$ 147	9
Other \| Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606		$ 26		$ 91

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