SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Disclosure information
Number of reportable segments | segment			5
Segment information
Net interest income	$ 58,036	$ 53,129	$ 171,880	$ 171,299
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	1,573	1,292	14,504	12,231
Mortgage banking income	1,154	5,280	5,574	16,655
Program fees	4,932	4,018	12,671	9,569
Other noninterest income	8,368	8,247	23,775	23,346
Total noninterest income	15,047	18,825	76,614	69,494
Total noninterest expense	46,105	44,435	142,331	138,030
INCOME BEFORE INCOME TAX EXPENSE	25,405	26,227	91,659	90,532
Income (loss) before income tax expense	25,405	26,227	91,659	90,532
Income tax expense (benefit)	5,922	6,218	20,349	20,548
NET INCOME	19,483	20,009	71,310	69,984
Period-end assets	$ 5,999,663	$ 6,187,634	$ 5,999,663	$ 6,187,634	$ 6,093,632
Net interest margin (as percent)	4.05%	3.61%	3.95%	3.86%
Net-revenue concentration (as percent)	100.00%	100.00%	100.00%	100.00%
Core Banking Activities
Segment Disclosure information
Number of reportable segments | segment			3
Segment information
Net interest income	$ 49,685	$ 46,841	$ 133,749	$ 139,866
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(1,139)	(267)	(1,308)	(656)
Mortgage banking income	1,154	5,280	5,574	16,655
Other noninterest income	8,306	8,182	23,376	23,042
Total noninterest income	9,460	13,462	28,950	39,699
Total noninterest expense	40,633	40,237	124,675	122,725
INCOME BEFORE INCOME TAX EXPENSE	19,651	20,333	39,332	57,496
Income (loss) before income tax expense	19,651	20,333	39,332	57,496
Income tax expense (benefit)	4,694	4,810	8,263	12,444
NET INCOME	14,957	15,523	31,069	45,052
Period-end assets	$ 5,494,646	$ 5,698,965	$ 5,494,646	$ 5,698,965
Net interest margin (as percent)	3.54%	3.25%	3.16%	3.24%
Net-revenue concentration (as percent)	81.00%	84.00%	65.00%	74.00%
Traditional Banking
Segment information
Net interest income	$ 46,562	$ 40,297	$ 121,868	$ 119,677
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(753)	(44)	(287)	(126)
Other noninterest income	8,260	8,105	23,225	22,859
Total noninterest income	8,260	8,105	23,225	22,861
Total noninterest expense	37,777	35,924	114,310	110,191
INCOME BEFORE INCOME TAX EXPENSE	17,798	12,522	31,070	32,473
Income (loss) before income tax expense	17,798	12,522	31,070	32,473
Income tax expense (benefit)	4,278	3,038	6,397	6,718
NET INCOME	13,520	9,484	24,673	25,755
Period-end assets	$ 5,036,343	$ 4,907,503	$ 5,036,343	$ 4,907,503
Net interest margin (as percent)	3.63%	3.22%	3.20%	3.21%
Net-revenue concentration (as percent)	75.00%	67.00%	58.00%	59.00%
Warehouse Lending
Segment information
Net interest income	$ 3,011	$ 6,291	$ 11,412	$ 19,387
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(386)	(223)	(1,021)	(530)
Other noninterest income	13	15	38	43
Total noninterest income	13	15	38	43
Total noninterest expense	851	1,056	2,838	3,150
INCOME BEFORE INCOME TAX EXPENSE	2,559	5,473	9,633	16,810
Income (loss) before income tax expense	2,559	5,473	9,633	16,810
Income tax expense (benefit)	572	1,258	2,168	3,919
NET INCOME	1,987	4,215	7,465	12,891
Period-end assets	$ 441,885	$ 750,266	$ 441,885	$ 750,266
Net interest margin (as percent)	2.54%	3.51%	2.79%	3.47%
Net-revenue concentration (as percent)	4.00%	9.00%	5.00%	8.00%
Mortgage Banking
Segment information
Net interest income	$ 112	$ 253	$ 469	$ 802
Mortgage banking income	1,154	5,280	5,574	16,655
Other noninterest income	33	62	113	140
Total noninterest income	1,187	5,342	5,687	16,795
Total noninterest expense	2,005	3,257	7,527	9,384
INCOME BEFORE INCOME TAX EXPENSE	(706)	2,338	(1,371)	8,213
Income (loss) before income tax expense	(706)	2,338	(1,371)	8,213
Income tax expense (benefit)	(156)	514	(302)	1,807
NET INCOME	(550)	1,824	(1,069)	6,406
Period-end assets	$ 16,418	$ 41,196	$ 16,418	$ 41,196
Net-revenue concentration (as percent)	2.00%	8.00%	2.00%	7.00%
Republic Processing Group
Segment Disclosure information
Number of reportable segments | segment			2
Segment information
Net interest income	$ 8,351	$ 6,288	$ 38,131	$ 31,433
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	2,712	1,559	15,812	12,887
Program fees	4,932	4,018	12,671	9,569
Other noninterest income	62	65	399	304
Total noninterest income	5,587	5,363	47,664	29,795
Total noninterest expense	5,472	4,198	17,656	15,305
INCOME BEFORE INCOME TAX EXPENSE	5,754	5,894	52,327	33,036
Income (loss) before income tax expense	5,754	5,894	52,327	33,036
Income tax expense (benefit)	1,228	1,408	12,086	8,104
NET INCOME	4,526	4,486	40,241	24,932
Period-end assets	$ 505,017	$ 488,669	$ 505,017	$ 488,669
Net-revenue concentration (as percent)	19.00%	16.00%	35.00%	26.00%
Tax Refund Solutions
Segment information
Net interest income	$ 1,709	$ 294	$ 18,751	$ 15,593
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(1,296)	(2,261)	6,976	7,850
Program fees	724	762	2,187	2,373
Other noninterest income	62	65	399	304
Total noninterest income	1,379	2,107	37,180	22,599
Total noninterest expense	3,248	2,966	11,926	11,965
INCOME BEFORE INCOME TAX EXPENSE	1,136	1,696	37,029	18,377
Income (loss) before income tax expense	1,136	1,696	37,029	18,377
Income tax expense (benefit)	202	371	8,573	4,467
NET INCOME	934	1,325	28,456	13,910
Period-end assets	$ 395,873	$ 365,552	$ 395,873	$ 365,552
Net-revenue concentration (as percent)	4.00%	3.00%	23.00%	16.00%
Republic Credit Solutions
Segment information
Net interest income	$ 6,642	$ 5,994	$ 19,380	$ 15,840
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	4,008	3,820	8,836	5,037
Program fees	4,208	3,256	10,484	7,196
Total noninterest income	4,208	3,256	10,484	7,196
Total noninterest expense	2,224	1,232	5,730	3,340
INCOME BEFORE INCOME TAX EXPENSE	4,618	4,198	15,298	14,659
Income (loss) before income tax expense	4,618	4,198	15,298	14,659
Income tax expense (benefit)	1,026	1,037	3,513	3,637
NET INCOME	3,592	3,161	11,785	11,022
Period-end assets	$ 109,144	$ 123,117	$ 109,144	$ 123,117
Net-revenue concentration (as percent)	15.00%	13.00%	12.00%	10.00%
Net refund transfer fees
Segment information
Revenue under 606	$ 593	$ 1,280	$ 16,594	$ 19,924
Net refund transfer fees | Core Banking Activities
Segment information
Revenue under 606				2
Net refund transfer fees | Traditional Banking
Segment information
Revenue under 606				2
Net refund transfer fees | Republic Processing Group
Segment information
Revenue under 606	593	1,280	16,594	19,922
Net refund transfer fees | Tax Refund Solutions
Segment information
Revenue under 606	$ 593	$ 1,280	16,594	$ 19,922
Contract termination fee
Segment information
Revenue under 606			5,000
Contract termination fee | Republic Processing Group
Segment information
Revenue under 606			5,000
Contract termination fee | Tax Refund Solutions
Segment information
Revenue under 606			5,000
Legal settlement
Segment information
Revenue under 606			13,000
Legal settlement | Republic Processing Group
Segment information
Revenue under 606			13,000
Legal settlement | Tax Refund Solutions
Segment information
Revenue under 606			$ 13,000