SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Disclosure information
Number of reportable segments | segment			5
Segment information
Net interest income	$ 52,205	$ 53,946	$ 124,943	$ 126,245
Provision for expected credit loss expense	6,534	4,460	29,294	21,691
Net refund transfer fees	2,913	3,629	18,736	20,729
Mortgage banking income	8,398	2,416	13,193	3,955
Program fees	1,138	1,037	3,762	2,111
Other noninterest income	6,302	8,043	13,629	15,747
Total noninterest income	18,751	15,125	49,320	42,542
Total noninterest expenses	44,825	43,428	91,794	88,937
INCOME BEFORE INCOME TAX EXPENSE	19,597	21,183	53,175	58,159
Income tax expense (benefit)	3,793	3,176	10,674	10,636
NET INCOME	15,804	18,007	42,501	47,523
Period-end assets	$ 6,460,575	$ 5,723,134	$ 6,460,575	$ 5,723,134	$ 5,620,319
Net interest margin (as percent)	3.62%	4.12%	4.55%	4.88%
Net-revenue concentration (as percent)	100.00%	100.00%	100.00%	100.00%
Core Banking
Segment Disclosure information
Number of reportable segments | segment			3
Segment information
Net interest income	$ 45,517	$ 46,004	$ 90,658	$ 90,348
Provision for expected credit loss expense	3,529	1,844	9,450	2,258
Mortgage banking income	8,398	2,416	13,193	3,955
Other noninterest income	6,151	7,922	13,421	14,868
Total noninterest income	14,549	10,338	26,614	18,823
Total noninterest expenses	40,188	39,910	79,634	77,538
INCOME BEFORE INCOME TAX EXPENSE	16,349	14,588	28,188	29,375
Income tax expense (benefit)	3,102	1,635	4,916	3,909
NET INCOME	13,247	12,953	23,272	25,466
Period-end assets	$ 6,050,677	$ 5,564,317	$ 6,050,677	$ 5,564,317
Net interest margin (as percent)	3.23%	3.62%	3.43%	3.69%
Net-revenue concentration (as percent)	84.00%	82.00%	67.00%	65.00%
Traditional Banking
Segment information
Net interest income	$ 39,035	$ 41,877	$ 79,656	$ 83,224
Provision for expected credit loss expense	3,080	1,427	8,669	1,616
Other noninterest income	6,126	7,853	13,361	14,749
Total noninterest income	6,126	7,853	13,361	14,749
Total noninterest expenses	36,688	37,764	73,335	73,314
INCOME BEFORE INCOME TAX EXPENSE	5,393	10,539	11,013	23,043
Income tax expense (benefit)	729	744	1,189	2,509
NET INCOME	4,664	9,795	9,824	20,534
Period-end assets	$ 4,967,759	$ 4,805,449	$ 4,967,759	$ 4,805,449
Net interest margin (as percent)	3.26%	3.75%	3.52%	3.81%
Net-revenue concentration (as percent)	63.00%	72.00%	53.00%	58.00%
Warehouse Lending
Segment information
Net interest income	$ 6,063	$ 3,957	$ 10,370	$ 6,852
Provision for expected credit loss expense	449	417	781	642
Other noninterest income	17	13	28	23
Total noninterest income	17	13	28	23
Total noninterest expenses	811	792	1,614	1,550
INCOME BEFORE INCOME TAX EXPENSE	4,820	2,761	8,003	4,683
Income tax expense (benefit)	1,085	621	1,801	1,054
NET INCOME	3,735	2,140	6,202	3,629
Period-end assets	$ 1,028,400	$ 738,300	$ 1,028,400	$ 738,300
Net interest margin (as percent)	3.01%	2.49%	2.86%	2.63%
Net-revenue concentration (as percent)	9.00%	6.00%	6.00%	4.00%
Mortgage Banking
Segment information
Net interest income	$ 419	$ 170	$ 632	$ 272
Mortgage banking income	8,398	2,416	13,193	3,955
Other noninterest income	8	56	32	96
Total noninterest income	8,406	2,472	13,225	4,051
Total noninterest expenses	2,689	1,354	4,685	2,674
INCOME BEFORE INCOME TAX EXPENSE	6,136	1,288	9,172	1,649
Income tax expense (benefit)	1,288	270	1,926	346
NET INCOME	4,848	1,018	7,246	1,303
Period-end assets	$ 54,518	$ 20,568	$ 54,518	$ 20,568
Net-revenue concentration (as percent)	12.00%	4.00%	8.00%	3.00%
Republic Processing Group
Segment Disclosure information
Number of reportable segments | segment			2
Segment information
Net interest income	$ 6,688	$ 7,942	$ 34,285	$ 35,897
Provision for expected credit loss expense	3,005	2,616	19,844	19,433
Net refund transfer fees	2,913	3,629	18,736	20,729
Program fees	1,138	1,037	3,762	2,111
Other noninterest income	151	121	208	879
Total noninterest income	4,202	4,787	22,706	23,719
Total noninterest expenses	4,637	3,518	12,160	11,399
INCOME BEFORE INCOME TAX EXPENSE	3,248	6,595	24,987	28,784
Income tax expense (benefit)	691	1,541	5,758	6,727
NET INCOME	2,557	5,054	19,229	22,057
Period-end assets	$ 409,898	$ 158,817	$ 409,898	$ 158,817
Net-revenue concentration (as percent)	16.00%	18.00%	33.00%	35.00%
Tax Refund Solutions
Segment information
Net interest income	$ 1,081	$ 710	$ 21,606	$ 21,148
Provision for expected credit loss expense	4,448	392	19,581	13,826
Net refund transfer fees	2,913	3,629	18,736	20,729
Program fees	618	50	930	196
Other noninterest income	151	89	208	220
Total noninterest income	3,682	3,768	19,874	21,145
Total noninterest expenses	3,734	2,849	10,363	9,963
INCOME BEFORE INCOME TAX EXPENSE	(3,419)	1,237	11,536	18,504
Income tax expense (benefit)	(853)	288	2,644	4,318
NET INCOME	(2,566)	949	8,892	14,186
Period-end assets	$ 306,583	$ 36,834	$ 306,583	$ 36,834
Net-revenue concentration (as percent)	7.00%	6.00%	24.00%	25.00%
Republic Credit Solutions
Segment information
Net interest income	$ 5,607	$ 7,232	$ 12,679	$ 14,749
Provision for expected credit loss expense	(1,443)	2,224	263	5,607
Program fees	520	987	2,832	1,915
Other noninterest income		32		659
Total noninterest income	520	1,019	2,832	2,574
Total noninterest expenses	903	669	1,797	1,436
INCOME BEFORE INCOME TAX EXPENSE	6,667	5,358	13,451	10,280
Income tax expense (benefit)	1,544	1,253	3,114	2,409
NET INCOME	5,123	4,105	10,337	7,871
Period-end assets	$ 103,315	$ 121,983	$ 103,315	$ 121,983
Net-revenue concentration (as percent)	9.00%	12.00%	9.00%	10.00%