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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue recognition
Net interest income	$ 312,154	$ 288,778	$ 236,691
NONINTEREST INCOME:
Mortgage banking income	5,438	3,542	6,196
Program fees	17,818	15,582	16,172
Increase in cash surrender value of BOLI	3,208	2,719	2,526
Death benefits in excess of cash surrender value of life insurance		1,728
Total noninterest income	72,650	71,457	89,810
Total net revenue	$ 384,804	$ 360,235	$ 326,501
Net-revenue concentration (as percent)	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	$ 215,608	$ 204,245	$ 185,791
NONINTEREST INCOME:
Mortgage banking income	5,438	3,542	6,196
Increase in cash surrender value of BOLI	3,208	2,719	2,526
Death benefits in excess of cash surrender value of life insurance		1,728
Total noninterest income	39,141	39,545	38,030
Total net revenue	$ 254,749	$ 243,790	$ 223,821
Net-revenue concentration (as percent)	66.00%	68.00%	69.00%
Traditional Banking
Revenue recognition
Net interest income	$ 203,139	$ 194,798	$ 172,062
NONINTEREST INCOME:
Mortgage banking income	5,438	3,542	6,196
Increase in cash surrender value of BOLI	3,208	2,719	2,526
Death benefits in excess of cash surrender value of life insurance		1,728
Total noninterest income	39,079	39,501	37,980
Total net revenue	$ 242,218	$ 234,299	$ 210,042
Net-revenue concentration (as percent)	63.00%	65.00%	65.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 12,469	$ 9,447	$ 13,729
NONINTEREST INCOME:
Total noninterest income	62	44	50
Total net revenue	$ 12,531	$ 9,491	$ 13,779
Net-revenue concentration (as percent)	3.00%	3.00%	4.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 96,546	$ 84,533	$ 50,900
NONINTEREST INCOME:
Program fees	17,818	15,582	16,172
Total noninterest income	33,509	31,912	51,780
Total net revenue	$ 130,055	$ 116,445	$ 102,680
Net-revenue concentration (as percent)	34.00%	32.00%	31.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 34,420	$ 29,557	$ 16,896
NONINTEREST INCOME:
Total noninterest income	15,536	16,089	35,504
Total net revenue	$ 49,956	$ 45,646	$ 52,400
Net-revenue concentration (as percent)	13.00%	13.00%	16.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 11,811	$ 15,729	$ 4,819	$ 4,819
NONINTEREST INCOME:
Program fees	3,121	2,827	2,872	2,872
Total noninterest income	3,272	2,985	$ 2,976	2,976
Total net revenue	$ 15,083	$ 18,714		$ 7,795
Net-revenue concentration (as percent)	4.00%	5.00%	2.00%	2.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 50,315	$ 39,247	$ 29,185	$ 29,185
NONINTEREST INCOME:
Program fees	14,697	12,755	13,300	13,300
Total noninterest income	14,701	12,838	$ 13,300	13,300
Total net revenue	$ 65,016	$ 52,085		$ 42,485
Net-revenue concentration (as percent)	17.00%	14.00%	13.00%	13.00%
Service charges on deposit accounts
NONINTEREST INCOME:
Revenue under 606	$ 14,186	$ 13,855	$ 13,426
Service charges on deposit accounts | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	14,182	13,854	13,438
Service charges on deposit accounts | Traditional Banking
NONINTEREST INCOME:
Revenue under 606	14,120	13,810	13,388
Service charges on deposit accounts | Warehouse Lending
NONINTEREST INCOME:
Revenue under 606	62	44	50
Service charges on deposit accounts | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	4	1	(12)
Service charges on deposit accounts | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606			(12)
Service charges on deposit accounts | Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606	1
Service charges on deposit accounts | Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606	3	1
Net refund transfer fees
NONINTEREST INCOME:
Revenue under 606	15,356	15,748	17,080
Net refund transfer fees | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	15,356	15,748	17,080
Net refund transfer fees | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	15,356	15,748	17,080
Interchange fee income
NONINTEREST INCOME:
Revenue under 606	12,967	13,057	13,125
Interchange fee income | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	12,855	12,926	12,943
Interchange fee income | Traditional Banking
NONINTEREST INCOME:
Revenue under 606	12,855	12,926	12,943
Interchange fee income | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	112	131	182
Interchange fee income | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	108	126	176
Interchange fee income | Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606	3	4		$ 6
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	(206)	(211)	(211)
Net losses on other real estate owned | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	(206)	(211)	(211)
Net losses on other real estate owned | Traditional Banking
NONINTEREST INCOME:
Revenue under 606	(206)	(211)	(211)
Contract termination fee
NONINTEREST INCOME:
Revenue under 606		1,728	5,000
Contract termination fee | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606		1,728
Contract termination fee | Traditional Banking
NONINTEREST INCOME:
Revenue under 606		1,728
Contract termination fee | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606			5,000
Contract termination fee | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606			5,000
Legal settlement
NONINTEREST INCOME:
Revenue under 606			13,000
Legal settlement | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606			13,000
Legal settlement | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606			13,000
Other
NONINTEREST INCOME:
Revenue under 606	3,883	5,437	3,496
Other | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606	3,664	4,987
Other | Traditional Banking
NONINTEREST INCOME:
Revenue under 606	3,664	4,987
Other | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606	219	450
Other | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606	72	215
Other | Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606	$ 147	154
Other | Republic Credit Solutions
NONINTEREST INCOME:
Revenue under 606		$ 81
Other
NONINTEREST INCOME:
Revenue under 606			3,496
Other | Core Banking Activities
NONINTEREST INCOME:
Revenue under 606			3,138
Other | Traditional Banking
NONINTEREST INCOME:
Revenue under 606			3,138
Other | Republic Processing Group
NONINTEREST INCOME:
Revenue under 606			358
Other | Tax Refund Solutions
NONINTEREST INCOME:
Revenue under 606			$ 260
Other | Republic Payment Solutions
NONINTEREST INCOME:
Revenue under 606				$ 98

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