REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue recognition
Net interest income	$ 288,778	$ 236,691	$ 222,740
Noninterest income:
Mortgage banking income	3,542	6,196	19,994
Program fees	15,582	16,172	14,237
Increase in cash surrender value of BOLI	2,719	2,526	2,242
Death benefits in excess of cash surrender value of life insurance	1,728		979
Total noninterest income	71,457	89,810	86,575
Total net revenue	$ 360,235	$ 326,501	$ 309,315
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	$ 204,245	$ 185,791	$ 183,548
Noninterest income:
Mortgage banking income	3,542	6,196	19,994
Increase in cash surrender value of BOLI	2,719	2,526	2,242
Death benefits in excess of cash surrender value of life insurance	1,728
Total noninterest income	39,545	38,030	51,734
Total net revenue	$ 243,790	$ 223,821	$ 235,282
Net-revenue concentration (as percent)	68.00%	69.00%	76.00%
Traditional Banking
Revenue recognition
Net interest income	$ 194,516	$ 171,543	$ 157,249
Noninterest income:
Increase in cash surrender value of BOLI	2,719	2,526	2,242
Death benefits in excess of cash surrender value of life insurance	1,728
Total noninterest income	35,885	31,648	31,492
Total net revenue	$ 230,401	$ 203,191	$ 188,741
Net-revenue concentration (as percent)	64.00%	63.00%	61.00%
Warehouse Lending
Revenue recognition
Net interest income	$ 9,447	$ 13,729	$ 25,218
Noninterest income:
Total noninterest income	44	50	57
Total net revenue	$ 9,491	$ 13,779	$ 25,275
Net-revenue concentration (as percent)	3.00%	4.00%	8.00%
Mortgage Banking
Revenue recognition
Net interest income	$ 282	$ 519	$ 1,081
Noninterest income:
Mortgage banking income	3,542	6,196	19,994
Total noninterest income	3,616	6,332	20,185
Total net revenue	$ 3,898	$ 6,851	$ 21,266
Net-revenue concentration (as percent)	1.00%	2.00%	7.00%
Republic Processing Group
Revenue recognition
Net interest income	$ 84,533	$ 50,900	$ 39,192
Noninterest income:
Program fees	15,582	16,172	14,237
Total noninterest income	31,912	51,780	34,841
Total net revenue	$ 116,445	$ 102,680	$ 74,033
Net-revenue concentration (as percent)	32.00%	31.00%	24.00%
Tax Refund Solutions
Revenue recognition
Net interest income	$ 29,557	$ 16,896	$ 14,999
Noninterest income:
Total noninterest income	16,089	35,504	20,596
Total net revenue	$ 45,646	$ 52,400	$ 35,595
Net-revenue concentration (as percent)	13.00%	16.00%	12.00%
Republic Payment Solutions
Revenue recognition
Net interest income	$ 15,729	$ 4,819	$ 838
Noninterest income:
Program fees	2,827	2,872	3,171
Total noninterest income	2,985	2,976	3,179
Total net revenue	$ 18,714	$ 7,795	$ 4,017
Net-revenue concentration (as percent)	5.00%	2.00%	1.00%
Republic Credit Solutions
Revenue recognition
Net interest income	$ 39,247	$ 29,185	$ 23,355
Noninterest income:
Program fees	12,755	13,300	11,066
Total noninterest income	12,838	13,300	11,066
Total net revenue	$ 52,085	$ 42,485	$ 34,421
Net-revenue concentration (as percent)	14.00%	13.00%	11.00%
Service charges on deposit accounts
Noninterest income:
Revenue under 606	$ 13,855	$ 13,426	$ 12,553
Service charges on deposit accounts \| Core Banking Activities
Noninterest income:
Revenue under 606	13,854	13,438	12,563
Service charges on deposit accounts \| Traditional Banking
Noninterest income:
Revenue under 606	13,810	13,388	12,506
Service charges on deposit accounts \| Warehouse Lending
Noninterest income:
Revenue under 606	44	50	57
Service charges on deposit accounts \| Republic Processing Group
Noninterest income:
Revenue under 606	1	(12)	(10)
Service charges on deposit accounts \| Tax Refund Solutions
Noninterest income:
Revenue under 606		(12)	(10)
Service charges on deposit accounts \| Republic Credit Solutions
Noninterest income:
Revenue under 606	1
Net refund transfer fees
Noninterest income:
Revenue under 606	15,748	17,080	20,248
Net refund transfer fees \| Republic Processing Group
Noninterest income:
Revenue under 606	15,748	17,080	20,248
Net refund transfer fees \| Tax Refund Solutions
Noninterest income:
Revenue under 606	15,748	17,080	20,248
Interchange fee income
Noninterest income:
Revenue under 606	13,057	13,125	13,062
Interchange fee income \| Core Banking Activities
Noninterest income:
Revenue under 606	12,926	12,943	12,777
Interchange fee income \| Traditional Banking
Noninterest income:
Revenue under 606	12,926	12,943	12,777
Interchange fee income \| Republic Processing Group
Noninterest income:
Revenue under 606	131	182	285
Interchange fee income \| Tax Refund Solutions
Noninterest income:
Revenue under 606	126	176	277
Interchange fee income \| Republic Payment Solutions
Noninterest income:
Revenue under 606	4	6	8
Interchange fee income \| Republic Credit Solutions
Noninterest income:
Revenue under 606	1
Net losses on other real estate owned
Noninterest income:
Revenue under 606	(211)	(211)	(160)
Net losses on other real estate owned \| Core Banking Activities
Noninterest income:
Revenue under 606	(211)	(211)	(160)
Net losses on other real estate owned \| Traditional Banking
Noninterest income:
Revenue under 606	(211)	(211)	(160)
Contract termination fee
Noninterest income:
Revenue under 606		5,000
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	5,437	3,496	3,420
Other \| Core Banking Activities
Noninterest income:
Revenue under 606	4,987	3,138
Other \| Traditional Banking
Noninterest income:
Revenue under 606	4,913	3,002
Other \| Mortgage Banking
Noninterest income:
Revenue under 606	74	136
Other \| Republic Processing Group
Noninterest income:
Revenue under 606	450	358
Other \| Tax Refund Solutions
Noninterest income:
Revenue under 606	215	260
Other \| Republic Payment Solutions
Noninterest income:
Revenue under 606	154	$ 98
Other \| Republic Credit Solutions
Noninterest income:
Revenue under 606	$ 81
Other
Noninterest income:
Revenue under 606			4,399
Other \| Core Banking Activities
Noninterest income:
Revenue under 606			4,318
Other \| Traditional Banking
Noninterest income:
Revenue under 606			4,127
Other \| Mortgage Banking
Noninterest income:
Revenue under 606			191
Other \| Republic Processing Group
Noninterest income:
Revenue under 606			81
Other \| Tax Refund Solutions
Noninterest income:
Revenue under 606			$ 81

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