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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
	Jun. 06, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue recognition
Net interest income		$ 64,825	$ 58,597			$ 221,996	$ 173,578
Noninterest income:
Mortgage banking income		852	1,154			2,559	5,574
Program fees		4,041	4,932			11,021	12,671
Increase in cash surrender value of BOLI		690	617			2,014	1,852
Death benefits in excess of cash surrender value of life insurance						1,728
Total noninterest income		14,019	15,108			56,351	76,686
Total net revenue		$ 78,844	$ 73,705			$ 278,347	$ 250,264
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		$ 49,960	$ 49,685			$ 153,600	$ 133,749
Noninterest income:
Mortgage banking income		852	1,154			2,559	5,574
Increase in cash surrender value of BOLI		690	617			2,014	1,852
Death benefits in excess of cash surrender value of life insurance						1,728
Total noninterest income		9,626	9,521			29,383	29,022
Total net revenue		$ 59,586	$ 59,206			$ 182,983	$ 162,771
Net-revenue concentration (as percent)		76.00%	81.00%			66.00%	65.00%
Traditional Banking
Revenue recognition
Net interest income		$ 47,409	$ 46,562			$ 146,198	$ 121,868
Noninterest income:
Increase in cash surrender value of BOLI		690	617			2,014	1,852
Death benefits in excess of cash surrender value of life insurance						1,728
Total noninterest income		8,748	8,321			26,732	23,297
Total net revenue		$ 56,157	$ 54,883			$ 172,930	$ 145,165
Net-revenue concentration (as percent)		72.00%	75.00%			62.00%	58.00%
Warehouse Lending
Revenue recognition
Net interest income		$ 2,467	$ 3,011			$ 7,196	$ 11,412
Noninterest income:
Total noninterest income		11	13			33	38
Total net revenue		$ 2,478	$ 3,024			$ 7,229	$ 11,450
Net-revenue concentration (as percent)		3.00%	4.00%			3.00%	5.00%
Mortgage Banking
Revenue recognition
Net interest income		$ 84	$ 112			$ 206	$ 469
Noninterest income:
Mortgage banking income		852	1,154			2,559	5,574
Total noninterest income		867	1,187			2,618	5,687
Total net revenue		$ 951	$ 1,299			$ 2,824	$ 6,156
Net-revenue concentration (as percent)		1.00%	2.00%			1.00%	2.00%
Republic Processing Group
Revenue recognition
Net interest income		$ 14,865	$ 8,912			$ 68,396	$ 39,829
Noninterest income:
Program fees		4,041	4,932			11,021	12,671
Total noninterest income		4,393	5,587			26,968	47,664
Total net revenue		$ 19,258	$ 14,499			$ 95,364	$ 87,493
Net-revenue concentration (as percent)		24.00%	19.00%			34.00%	35.00%
Tax Refund Solutions
Revenue recognition
Net interest income		$ 4,525	$ 1,709			$ 40,300	$ 18,751
Noninterest income:
Program fees		705	724			2,140	2,187
Total noninterest income		1,029	1,379			17,994	37,180
Total net revenue		$ 5,554	$ 3,088			$ 58,294	$ 55,931
Net-revenue concentration (as percent)		7.00%	4.00%			21.00%	22.00%
Republic Credit Solutions
Revenue recognition
Net interest income		$ 10,340	$ 7,203			$ 28,096	$ 21,078
Noninterest income:
Program fees		3,336	4,208			8,881	10,484
Total noninterest income		3,364	4,208			8,974	10,484
Total net revenue		$ 13,704	$ 11,411			$ 37,070	$ 31,562
Net-revenue concentration (as percent)		17.00%	15.00%			13.00%	13.00%
Service charges on deposit accounts
Noninterest income:
Revenue under 606		$ 3,559	$ 3,409			$ 10,385	$ 9,998
Service charges on deposit accounts | Core Banking Activities
Noninterest income:
Revenue under 606		3,558	3,410			10,384	10,009
Service charges on deposit accounts | Traditional Banking
Noninterest income:
Revenue under 606		3,547	3,397			10,351	9,971
Service charges on deposit accounts | Warehouse Lending
Noninterest income:
Revenue under 606		11	13			33	38
Service charges on deposit accounts | Republic Processing Group
Noninterest income:
Revenue under 606		1	(1)			1	(11)
Service charges on deposit accounts | Tax Refund Solutions
Noninterest income:
Revenue under 606			(1)				(11)
Service charges on deposit accounts | Republic Credit Solutions
Noninterest income:
Revenue under 606		1				1
Net refund transfer fees
Noninterest income:
Revenue under 606		242	593			15,528	16,594
Net refund transfer fees | Republic Processing Group
Noninterest income:
Revenue under 606		242	593			15,528	16,594
Net refund transfer fees | Tax Refund Solutions
Noninterest income:
Revenue under 606		242	593			15,528	16,594
Interchange fee income
Noninterest income:
Revenue under 606		3,282	3,322			9,752	9,853
Interchange fee income | Core Banking Activities
Noninterest income:
Revenue under 606		3,258	3,292			9,639	9,693
Interchange fee income | Traditional Banking
Noninterest income:
Revenue under 606		3,258	3,292			9,639	9,693
Interchange fee income | Republic Processing Group
Noninterest income:
Revenue under 606		24	30			113	160
Interchange fee income | Tax Refund Solutions
Noninterest income:
Revenue under 606		23	30			112	160
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		(53)	(53)			(158)	(158)
Net losses on other real estate owned | Core Banking Activities
Noninterest income:
Revenue under 606		(53)	(53)			(158)	(158)
Net losses on other real estate owned | Traditional Banking
Noninterest income:
Revenue under 606		(53)	(53)			(158)	(158)
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
Contract termination fee | Green Dot
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
Legal settlement | Green Dot
Noninterest income:
Revenue under 606	$ 13,000			$ 13,000
Other
Noninterest income:
Revenue under 606		1,406	1,134			3,522	2,302
Other | Core Banking Activities
Noninterest income:
Revenue under 606		1,321	1,101			3,217	2,052
Other | Traditional Banking
Noninterest income:
Revenue under 606		1,306	1,068			3,158	1,939
Other | Mortgage Banking
Noninterest income:
Revenue under 606		15	33			59	113
Other | Republic Processing Group
Noninterest income:
Revenue under 606		85	33			305	250
Other | Tax Refund Solutions
Noninterest income:
Revenue under 606		59	$ 33			214	$ 250
Other | Republic Credit Solutions
Noninterest income:
Revenue under 606		$ 26				$ 91

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-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479557/942-235-S99-1

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