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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue recognition
Net interest income	$ 90,452	$ 102,688
Noninterest income:
Mortgage banking income	1,825	1,821
Program fees	4,549	3,822
Increase in cash surrender value of BOLI	930	793
Gain on sale of Republic Bank Finance ("RBF") loans/leases	5,845
Gain on sale of Visa Class B-1 shares		4,090
Total noninterest income	29,959	33,154
Total net revenue	$ 120,411	$ 135,842
Net-revenue concentration (as percent)	100.00%	100.00%
Writedowns during entity's holding of property (as a percent)	10.00%
Core Banking Activities
Revenue recognition
Net interest income	$ 63,227	$ 56,349
Noninterest income:
Mortgage banking income	1,825	1,821
Increase in cash surrender value of BOLI	930	793
Gain on sale of Republic Bank Finance ("RBF") loans/leases	5,845
Gain on sale of Visa Class B-1 shares		4,090
Total noninterest income	15,799	15,384
Total net revenue	$ 79,026	$ 71,733
Net-revenue concentration (as percent)	66.00%	53.00%
Traditional Banking
Revenue recognition
Net interest income	$ 59,327	$ 53,321
Noninterest income:
Mortgage banking income	1,825	1,821
Increase in cash surrender value of BOLI	930	793
Gain on sale of Republic Bank Finance ("RBF") loans/leases	5,845
Gain on sale of Visa Class B-1 shares		4,090
Total noninterest income	15,775	15,364
Total net revenue	$ 75,102	$ 68,685
Net-revenue concentration (as percent)	63.00%	51.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 3,900	$ 3,028
Noninterest income:
Total noninterest income	24	20
Total net revenue	$ 3,924	$ 3,048
Net-revenue concentration (as percent)	3.00%	2.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 27,225	$ 46,339
Noninterest income:
Program fees	4,549	3,822
Total noninterest income	14,160	17,770
Total net revenue	$ 41,385	$ 64,109
Net-revenue concentration (as percent)	34.00%	47.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 11,430	$ 29,812
Noninterest income:
Total noninterest income	9,608	13,947
Total net revenue	$ 21,038	$ 43,759
Net-revenue concentration (as percent)	17.00%	32.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 3,037	$ 3,994
Noninterest income:
Program fees	776	767
Total noninterest income	778	767
Total net revenue	$ 3,815	$ 4,761
Net-revenue concentration (as percent)	3.00%	4.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 12,758	$ 12,533
Noninterest income:
Program fees	3,773	3,055
Total noninterest income	3,774	3,056
Total net revenue	$ 16,532	$ 15,589
Net-revenue concentration (as percent)	14.00%	11.00%
Service charges on deposit accounts
Noninterest income:
Revenue	$ 3,883	$ 3,460
Service charges on deposit accounts | Core Banking Activities
Noninterest income:
Revenue	3,881	3,459
Service charges on deposit accounts | Traditional Banking
Noninterest income:
Revenue	3,859	3,439
Service charges on deposit accounts | Warehouse Lending
Noninterest income:
Revenue	22	20
Service charges on deposit accounts | Republic Processing Group
Noninterest income:
Revenue	2	1
Service charges on deposit accounts | Republic Payment Solutions
Noninterest income:
Revenue	1
Service charges on deposit accounts | Republic Credit Solutions
Noninterest income:
Revenue	1	1
Net refund transfer fees
Noninterest income:
Revenue	9,525	13,893
Net refund transfer fees | Republic Processing Group
Noninterest income:
Revenue	9,525	13,893
Net refund transfer fees | Tax Refund Solutions
Noninterest income:
Revenue	9,525	13,893
Interchange fee income
Noninterest income:
Revenue	2,873	3,077
Interchange fee income | Core Banking Activities
Noninterest income:
Revenue	2,839	3,044
Interchange fee income | Traditional Banking
Noninterest income:
Revenue	2,839	3,044
Interchange fee income | Republic Processing Group
Noninterest income:
Revenue	34	33
Interchange fee income | Tax Refund Solutions
Noninterest income:
Revenue	33	33
Interchange fee income | Republic Payment Solutions
Noninterest income:
Revenue	1
Net losses on other real estate owned
Noninterest income:
Revenue	(50)	(53)
Net losses on other real estate owned | Core Banking Activities
Noninterest income:
Revenue	(50)	(53)
Net losses on other real estate owned | Traditional Banking
Noninterest income:
Revenue	(50)	(53)
Other
Noninterest income:
Revenue	579	2,251
Other | Core Banking Activities
Noninterest income:
Revenue	529	2,230
Other | Traditional Banking
Noninterest income:
Revenue	527	2,230
Other | Warehouse Lending
Noninterest income:
Revenue	2
Other | Republic Processing Group
Noninterest income:
Revenue	50	21
Other | Tax Refund Solutions
Noninterest income:
Revenue	$ 50	$ 21

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