REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue recognition
Net interest income	$ 76,970	$ 71,305	$ 255,860	$ 236,760
Noninterest income:
Mortgage banking income	2,064	2,062	5,781	3,984
Program fees	4,888	4,962	13,161	13,539
Increase in cash surrender value of BOLI	1,035	826	2,649	2,372
Gain on sale of Visa Class B-1 shares			4,090
Total noninterest income	16,568	16,813	67,366	58,532
Total net revenue	$ 93,538	$ 88,118	$ 323,226	$ 295,292
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	$ 61,229	$ 54,603	$ 177,507	$ 157,948
Noninterest income:
Mortgage banking income	2,064	2,062	5,781	3,984
Increase in cash surrender value of BOLI	1,035	826	2,649	2,372
Gain on sale of Visa Class B-1 shares			4,090
Total noninterest income	10,523	11,094	36,376	29,463
Total net revenue	$ 71,752	$ 65,697	$ 213,883	$ 187,411
Net-revenue concentration (as percent)	76.00%	75.00%	66.00%	64.00%
Traditional Banking
Revenue recognition
Net interest income	$ 57,424	$ 51,023	$ 167,125	$ 149,197
Noninterest income:
Mortgage banking income	2,064	2,062	5,781	3,984
Increase in cash surrender value of BOLI	1,035	826	2,649	2,372
Gain on sale of Visa Class B-1 shares			4,090
Total noninterest income	10,502	11,078	36,312	29,421
Total net revenue	$ 67,926	$ 62,101	$ 203,437	$ 178,618
Net-revenue concentration (as percent)	72.00%	71.00%	63.00%	61.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 3,805	$ 3,580	$ 10,382	$ 8,751
Noninterest income:
Total noninterest income	21	16	64	42
Total net revenue	$ 3,826	$ 3,596	$ 10,446	$ 8,793
Net-revenue concentration (as percent)	4.00%	4.00%	3.00%	3.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 15,741	$ 16,702	$ 78,353	$ 78,812
Noninterest income:
Program fees	4,888	4,962	13,161	13,539
Total noninterest income	6,045	5,719	30,990	29,069
Total net revenue	$ 21,786	$ 22,421	$ 109,343	$ 107,881
Net-revenue concentration (as percent)	24.00%	25.00%	34.00%	36.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 280	$ 440	$ 30,154	$ 32,173
Noninterest income:
Total noninterest income	1,155	609	17,825	15,378
Total net revenue	$ 1,435	$ 1,049	$ 47,979	$ 47,551
Net-revenue concentration (as percent)	2.00%	1.00%	15.00%	16.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 3,193	$ 2,783	$ 10,750	$ 9,221
Noninterest income:
Program fees	781	786	2,283	2,319
Total noninterest income	782	933	2,285	2,468
Total net revenue	$ 3,975	$ 3,716	$ 13,035	$ 11,689
Net-revenue concentration (as percent)	4.00%	4.00%	4.00%	4.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 12,268	$ 13,479	$ 37,449	$ 37,418
Noninterest income:
Program fees	4,107	4,176	10,878	11,220
Total noninterest income	4,108	4,177	10,880	11,223
Total net revenue	$ 16,376	$ 17,656	$ 48,329	$ 48,641
Net-revenue concentration (as percent)	18.00%	20.00%	15.00%	16.00%
Service charges on deposit accounts
Noninterest income:
Revenue	$ 3,646	$ 3,693	$ 10,611	$ 10,532
Service charges on deposit accounts \| Core Banking Activities
Noninterest income:
Revenue	3,646	3,692	10,610	10,530
Service charges on deposit accounts \| Traditional Banking
Noninterest income:
Revenue	3,625	3,676	10,546	10,488
Service charges on deposit accounts \| Warehouse Lending
Noninterest income:
Revenue	21	16	64	42
Service charges on deposit accounts \| Republic Processing Group
Noninterest income:
Revenue		1	1	2
Service charges on deposit accounts \| Republic Credit Solutions
Noninterest income:
Revenue		1	1	2
Net refund transfer fees
Noninterest income:
Revenue	1,117	582	17,577	15,213
Net refund transfer fees \| Republic Processing Group
Noninterest income:
Revenue	1,117	582	17,577	15,213
Net refund transfer fees \| Tax Refund Solutions
Noninterest income:
Revenue	1,117	582	17,577	15,213
Interchange fee income
Noninterest income:
Revenue	3,030	3,286	9,307	9,794
Interchange fee income \| Core Banking Activities
Noninterest income:
Revenue	3,012	3,267	9,213	9,697
Interchange fee income \| Traditional Banking
Noninterest income:
Revenue	3,012	3,267	9,213	9,697
Interchange fee income \| Republic Processing Group
Noninterest income:
Revenue	18	19	94	97
Interchange fee income \| Tax Refund Solutions
Noninterest income:
Revenue	16	19	91	94
Interchange fee income \| Republic Payment Solutions
Noninterest income:
Revenue	1		2	2
Interchange fee income \| Republic Credit Solutions
Noninterest income:
Revenue	1		1	1
Net losses on OREO
Noninterest income:
Revenue	(52)	(53)	(158)	(154)
Net losses on OREO \| Core Banking Activities
Noninterest income:
Revenue	(52)	(53)	(158)	(154)
Net losses on OREO \| Traditional Banking
Noninterest income:
Revenue	(52)	(53)	(158)	(154)
Other
Noninterest income:
Revenue	840	1,455	4,348	3,252
Other \| Core Banking Activities
Noninterest income:
Revenue	818	1,300	4,191	3,034
Other \| Traditional Banking
Noninterest income:
Revenue	818	1,300	4,191	3,034
Other \| Republic Processing Group
Noninterest income:
Revenue	22	155	157	218
Other \| Tax Refund Solutions
Noninterest income:
Revenue	$ 22	8	$ 157	71
Other \| Republic Payment Solutions
Noninterest income:
Revenue		$ 147		$ 147

Income from mortgage banking activities Processing Group program fees and commissions.

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Income from mortgage banking.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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