SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Disclosure information
Number of reportable segments | segment			5
Segment information
Net interest income	$ 51,232	$ 50,304	$ 113,844	$ 118,170
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	3,705	(4,323)	12,931	10,939
Mortgage banking income	1,763	4,182	4,420	11,375
Program fees	3,885	3,342	7,739	5,551
Other noninterest income	7,968	8,201	15,407	15,099
Total noninterest income	30,566	21,648	61,567	50,669
Total noninterest expense	47,653	45,714	96,226	93,595
INCOME BEFORE INCOME TAX EXPENSE	30,440	30,561	66,254	64,305
Income (loss) from continuing operations before income tax expense	30,440	30,561	66,254	64,305
Income tax expense (benefit)	6,539	6,639	14,427	14,330
NET INCOME	23,901	23,922	51,827	49,975
Period-end assets	$ 6,112,476	$ 6,183,310	$ 6,112,476	$ 6,183,310	$ 6,093,632
Net interest margin (as percent)	3.51%	3.33%	3.90%	3.98%
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	$ 43,197	$ 44,742	$ 84,064	$ 93,025
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(88)	(142)	(169)	(389)
Mortgage banking income	1,763	4,182	4,420	11,375
Other noninterest income	7,789	8,034	15,070	14,860
Total noninterest income	9,552	12,218	19,490	26,237
Total noninterest expense	42,181	41,011	84,042	82,488
INCOME BEFORE INCOME TAX EXPENSE	10,656	16,091	19,681	37,163
Income (loss) from continuing operations before income tax expense	10,656	16,091	19,681	37,163
Income tax expense (benefit)	2,148	3,083	3,569	7,634
NET INCOME	8,508	13,008	16,112	29,529
Period-end assets	$ 5,616,107	$ 5,661,664	$ 5,616,107	$ 5,661,664
Net interest margin (as percent)	3.02%	3.03%	2.97%	3.24%
Net-revenue concentration (as percent)	64.00%	79.00%	59.00%	71.00%
Traditional Banking
Segment information
Net interest income	$ 39,158	$ 38,278	$ 75,306	$ 79,380
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	146	(77)	466	(82)
Other noninterest income	7,731	7,970	14,965	14,754
Total noninterest income	7,731	7,972	14,965	14,756
Total noninterest expense	38,314	36,939	76,533	74,267
INCOME BEFORE INCOME TAX EXPENSE	8,429	9,388	13,272	19,951
Income (loss) from continuing operations before income tax expense	8,429	9,388	13,272	19,951
Income tax expense (benefit)	1,647	1,555	2,119	3,680
NET INCOME	6,782	7,833	11,153	16,271
Period-end assets	$ 4,997,734	$ 4,774,765	$ 4,997,734	$ 4,774,765
Net interest margin (as percent)	3.06%	2.97%	2.98%	3.21%
Net-revenue concentration (as percent)	57.00%	64.00%	51.00%	56.00%
Warehouse Lending
Segment information
Net interest income	$ 3,886	$ 6,324	$ 8,401	$ 13,096
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	(234)	(65)	(635)	(307)
Other noninterest income	12	14	25	28
Total noninterest income	12	14	25	28
Total noninterest expense	1,035	1,066	1,987	2,094
INCOME BEFORE INCOME TAX EXPENSE	3,097	5,337	7,074	11,337
Income (loss) from continuing operations before income tax expense	3,097	5,337	7,074	11,337
Income tax expense (benefit)	692	1,227	1,596	2,661
NET INCOME	2,405	4,110	5,478	8,676
Period-end assets	$ 596,031	$ 840,083	$ 596,031	$ 840,083
Net interest margin (as percent)	2.69%	3.48%	2.89%	3.45%
Net-revenue concentration (as percent)	5.00%	9.00%	5.00%	8.00%
Mortgage Banking
Segment information
Net interest income	$ 153	$ 140	$ 357	$ 549
Mortgage banking income	1,763	4,182	4,420	11,375
Other noninterest income	46	50	80	78
Total noninterest income	1,809	4,232	4,500	11,453
Total noninterest expense	2,832	3,006	5,522	6,127
INCOME BEFORE INCOME TAX EXPENSE	(870)	1,366	(665)	5,875
Income (loss) from continuing operations before income tax expense	(870)	1,366	(665)	5,875
Income tax expense (benefit)	(191)	301	(146)	1,293
NET INCOME	(679)	1,065	(519)	4,582
Period-end assets	$ 22,342	$ 46,816	$ 22,342	$ 46,816
Net-revenue concentration (as percent)	2.00%	6.00%	3.00%	7.00%
Republic Processing Group
Segment Disclosure information
Number of reportable segments | segment			2
Segment information
Net interest income	$ 8,035	$ 5,562	$ 29,780	$ 25,145
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	3,793	(4,181)	13,100	11,328
Program fees	3,885	3,342	7,739	5,551
Other noninterest income	179	167	337	239
Total noninterest income	21,014	9,430	42,077	24,432
Total noninterest expense	5,472	4,703	12,184	11,107
INCOME BEFORE INCOME TAX EXPENSE	19,784	14,470	46,573	27,142
Income (loss) from continuing operations before income tax expense	19,784	14,470	46,573	27,142
Income tax expense (benefit)	4,391	3,556	10,858	6,696
NET INCOME	15,393	10,914	35,715	20,446
Period-end assets	$ 496,369	$ 521,646	$ 496,369	$ 521,646
Net-revenue concentration (as percent)	36.00%	21.00%	41.00%	29.00%
Tax Refund Solutions
Segment information
Net interest income	$ 1,638	$ 623	$ 17,042	$ 15,299
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	360	(5,773)	8,272	10,111
Program fees	736	715	1,463	1,611
Other noninterest income	179	167	337	239
Total noninterest income	17,865	6,803	35,801	20,492
Total noninterest expense	3,533	3,697	8,678	8,999
INCOME BEFORE INCOME TAX EXPENSE	15,610	9,502	35,893	16,681
Income (loss) from continuing operations before income tax expense	15,610	9,502	35,893	16,681
Income tax expense (benefit)	3,465	2,326	8,371	4,096
NET INCOME	12,145	7,176	27,522	12,585
Period-end assets	$ 382,156	$ 389,999	$ 382,156	$ 389,999
Net-revenue concentration (as percent)	24.00%	10.00%	30.00%	21.00%
Republic Credit Solutions
Segment information
Net interest income	$ 6,397	$ 4,939	$ 12,738	$ 9,846
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	3,433	1,592	4,828	1,217
Program fees	3,149	2,627	6,276	3,940
Total noninterest income	3,149	2,627	6,276	3,940
Total noninterest expense	1,939	1,006	3,506	2,108
INCOME BEFORE INCOME TAX EXPENSE	4,174	4,968	10,680	10,461
Income (loss) from continuing operations before income tax expense	4,174	4,968	10,680	10,461
Income tax expense (benefit)	926	1,230	2,487	2,600
NET INCOME	3,248	3,738	8,193	7,861
Period-end assets	$ 114,213	$ 131,647	$ 114,213	$ 131,647
Net-revenue concentration (as percent)	12.00%	11.00%	11.00%	8.00%
Net refund transfer fees
Segment information
Revenue under 606	$ 3,950	$ 5,923	$ 16,001	$ 18,644
Net refund transfer fees | Core Banking Activities
Segment information
Revenue under 606		2		2
Net refund transfer fees | Traditional Banking
Segment information
Revenue under 606		2		2
Net refund transfer fees | Republic Processing Group
Segment information
Revenue under 606	3,950	5,921	16,001	18,642
Net refund transfer fees | Tax Refund Solutions
Segment information
Revenue under 606	3,950	$ 5,921	16,001	$ 18,642
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		13,000
Legal settlement | Republic Processing Group
Segment information
Revenue under 606	13,000		13,000
Legal settlement | Tax Refund Solutions
Segment information
Revenue under 606	$ 13,000		$ 13,000