SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Disclosure information
Number of reportable segments | segment	5
Segment information
Net interest income	$ 72,738	$ 72,299
Credit loss expense for on-balance sheet exposures	22,760	17,231
Net refund transfer fees	15,823	17,100
Mortgage banking income	4,795	1,539
Program fees	2,624	1,074
Other noninterest income	7,327	7,704
Total noninterest income	30,569	27,417
Total noninterest expenses	46,969	45,509
INCOME BEFORE INCOME TAX EXPENSE	33,578	36,976
Income tax expense (benefit)	6,881	7,460
Net income	26,697	29,516
Period-end assets	$ 5,722,033	$ 5,365,768	$ 5,620,319
Net interest margin (as percent)	5.57%	5.66%
Net-revenue concentration (as percent)	100.00%	100.00%
Core Banking Activities
Segment Disclosure information
Number of reportable segments | segment	3
Segment information
Net interest income	$ 45,141	$ 44,344
Credit loss expense for on-balance sheet exposures	5,921	414
Mortgage banking income	4,795	1,539
Other noninterest income	7,270	6,946
Total noninterest income	12,065	8,485
Total noninterest expenses	39,446	37,628
INCOME BEFORE INCOME TAX EXPENSE	11,839	14,787
Income tax expense (benefit)	1,814	2,274
Net income	10,025	12,513
Period-end assets	$ 5,375,938	$ 5,048,051
Net interest margin (as percent)	3.65%	3.76%
Net-revenue concentration (as percent)	55.00%	53.00%
Traditional Banking
Segment information
Net interest income	$ 40,620	$ 41,347
Credit loss expense for on-balance sheet exposures	5,589	189
Other noninterest income	7,235	6,896
Total noninterest income	7,235	6,896
Total noninterest expenses	36,647	35,550
INCOME BEFORE INCOME TAX EXPENSE	5,619	12,504
Income tax expense (benefit)	460	1,765
Net income	5,159	10,739
Period-end assets	$ 4,471,235	$ 4,471,419
Net interest margin (as percent)	3.80%	3.84%
Net-revenue concentration (as percent)	46.00%	48.00%
Warehouse Lending
Segment information
Net interest income	$ 4,307	$ 2,895
Credit loss expense for on-balance sheet exposures	332	225
Other noninterest income	11	10
Total noninterest income	11	10
Total noninterest expenses	803	758
INCOME BEFORE INCOME TAX EXPENSE	3,183	1,922
Income tax expense (benefit)	716	433
Net income	2,467	1,489
Period-end assets	$ 851,405	$ 559,545
Net interest margin (as percent)	2.68%	2.84%
Net-revenue concentration (as percent)	4.00%	3.00%
Mortgage Banking
Segment information
Net interest income	$ 214	$ 102
Mortgage banking income	4,795	1,539
Other noninterest income	24	40
Total noninterest income	4,819	1,579
Total noninterest expenses	1,996	1,320
INCOME BEFORE INCOME TAX EXPENSE	3,037	361
Income tax expense (benefit)	638	76
Net income	2,399	285
Period-end assets	$ 53,298	$ 17,087
Net-revenue concentration (as percent)	5.00%	2.00%
Republic Processing Group
Segment Disclosure information
Number of reportable segments | segment	2
Segment information
Net interest income	$ 27,597	$ 27,955
Credit loss expense for on-balance sheet exposures	16,839	16,817
Net refund transfer fees	15,823	17,100
Program fees	2,624	1,074
Other noninterest income	57	758
Total noninterest income	18,504	18,932
Total noninterest expenses	7,523	7,881
INCOME BEFORE INCOME TAX EXPENSE	21,739	22,189
Income tax expense (benefit)	5,067	5,186
Net income	16,672	17,003
Period-end assets	$ 346,095	$ 317,717
Net-revenue concentration (as percent)	45.00%	47.00%
Tax Refund Solutions
Segment information
Net interest income	$ 20,525	$ 20,438
Credit loss expense for on-balance sheet exposures	15,133	13,434
Net refund transfer fees	15,823	17,100
Program fees	312	146
Other noninterest income	57	131
Total noninterest income	16,192	17,377
Total noninterest expenses	6,629	7,114
INCOME BEFORE INCOME TAX EXPENSE	14,955	17,267
Income tax expense (benefit)	3,497	4,030
Net income	11,458	13,237
Period-end assets	$ 240,898	$ 224,485
Net-revenue concentration (as percent)	36.00%	38.00%
Republic Credit Solutions
Segment information
Net interest income	$ 7,072	$ 7,517
Credit loss expense for on-balance sheet exposures	1,706	3,383
Program fees	2,312	928
Other noninterest income		627
Total noninterest income	2,312	1,555
Total noninterest expenses	894	767
INCOME BEFORE INCOME TAX EXPENSE	6,784	4,922
Income tax expense (benefit)	1,570	1,156
Net income	5,214	3,766
Period-end assets	$ 105,197	$ 93,232
Net-revenue concentration (as percent)	9.00%	9.00%