SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Disclosure information
Number of operating segments | segment			4
Segment information
Net interest income	$ 43,137	$ 35,577	$ 99,575	$ 75,011
Provision for loan and lease losses	5,061	1,814	17,412	7,000
Net refund transfer fees	2,770	1,909	18,152	18,987
Mortgage banking income	1,445	1,560	2,605	2,821
Program fees	1,284	664	2,375	963
Other noninterest income	7,428	6,669	14,718	12,952
Total noninterest income	12,927	10,802	37,850	35,723
Total noninterest expenses	35,734	31,866	74,673	64,407
Income before income tax expense	15,269	12,699	45,340	39,327
Income tax expense	5,198	4,359	15,252	13,252
NET INCOME	10,071	8,340	30,088	26,075
Segment end of period assets	$ 4,955,661	$ 4,646,922	$ 4,955,661	$ 4,646,922	$ 4,816,309
Net interest margin (as percent)	3.87%	3.43%	4.44%	3.60%
Core Banking Activities
Segment Disclosure information
Number of operating segments | segment			3
Segment information
Net interest income	$ 37,955	$ 33,367	$ 74,583	$ 64,662
Provision for loan and lease losses	1,725	1,278	1,966	1,776
Mortgage banking income	1,445	1,560	2,605	2,821
Other noninterest income	7,094	6,439	13,634	12,646
Total noninterest income	8,539	7,999	16,239	15,467
Total noninterest expenses	32,991	29,624	65,073	56,434
Income before income tax expense	11,778	10,464	23,783	21,919
Income tax expense	3,931	3,550	7,429	6,937
NET INCOME	7,847	6,914	16,354	14,982
Segment end of period assets	$ 4,897,721	$ 4,593,343	$ 4,897,721	$ 4,593,343
Net interest margin (as percent)	3.46%	3.28%	3.39%	3.19%
Traditional Banking
Segment information
Net interest income	$ 33,434	$ 29,537	$ 66,094	$ 58,145
Provision for loan and lease losses	1,461	798	1,928	1,278
Other noninterest income	6,969	6,371	13,491	12,481
Total noninterest income	6,969	6,371	13,491	12,481
Total noninterest expenses	31,185	27,737	61,275	52,612
Income before income tax expense	7,757	7,373	16,382	16,736
Income tax expense	2,471	2,413	4,733	5,026
NET INCOME	5,286	4,960	11,649	11,710
Segment end of period assets	$ 4,283,741	$ 3,989,769	$ 4,283,741	$ 3,989,769
Net interest margin (as percent)	3.44%	3.23%	3.37%	3.15%
Warehouse Lending
Segment information
Net interest income	$ 4,435	$ 3,790	$ 8,336	$ 6,445
Provision for loan and lease losses	264	480	38	498
Other noninterest income	10	5	16	10
Total noninterest income	10	5	16	10
Total noninterest expenses	822	735	1,600	1,430
Income before income tax expense	3,359	2,580	6,714	4,527
Income tax expense	1,228	958	2,455	1,681
NET INCOME	2,131	1,622	4,259	2,846
Segment end of period assets	$ 600,060	$ 585,441	$ 600,060	$ 585,441
Net interest margin (as percent)	3.62%	3.67%	3.60%	3.65%
Mortgage Banking
Segment information
Net interest income	$ 86	$ 40	$ 153	$ 72
Mortgage banking income	1,445	1,560	2,605	2,821
Other noninterest income	115	63	127	155
Total noninterest income	1,560	1,623	2,732	2,976
Total noninterest expenses	984	1,152	2,198	2,392
Income before income tax expense	662	511	687	656
Income tax expense	232	179	241	230
NET INCOME	430	332	446	426
Segment end of period assets	13,920	18,133	13,920	18,133
Republic Processing Group
Segment information
Net interest income	5,182	2,210	24,992	10,349
Provision for loan and lease losses	3,336	536	15,446	5,224
Net refund transfer fees	2,770	1,909	18,152	18,987
Program fees	1,284	664	2,375	963
Other noninterest income	334	230	1,084	306
Total noninterest income	4,388	2,803	21,611	20,256
Total noninterest expenses	2,743	2,242	9,600	7,973
Income before income tax expense	3,491	2,235	21,557	17,408
Income tax expense	1,267	809	7,823	6,315
NET INCOME	2,224	1,426	13,734	11,093
Segment end of period assets	$ 57,940	$ 53,579	$ 57,940	$ 53,579