SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Interest income	$ 71,411	$ 59,340	$ 138,461	$ 113,899
Interest expense	8,254	4,751	14,714	8,874
Net interest income	63,157	54,589	123,747	105,025
Provision for loan losses	2,205	889	4,041	1,570	$ 4,091
Noninterest income	28,189	28,379	53,895	52,665
Noninterest expense
Salaries and employee benefits	29,132	27,531	56,926	53,718
Equipment and occupancy expenses	6,146	6,371	12,023	12,071
Data processing and telecommunications expenses	7,028	6,049	13,600	12,162
Other expenses	13,433	12,408	26,283	30,008
Total noninterest expense	55,739	52,359	108,832	107,959
Income before income tax expense	33,402	29,720	64,769	48,161
Income tax expense	10,315	9,671	20,529	15,795
Net income	23,087	20,049	44,240	32,366
Total assets	7,397,858	6,221,294	7,397,858	6,221,294	6,892,031
Goodwill	125,532	121,422	125,532	121,422	125,532
Other intangible assets, net	15,378	20,574	15,378	20,574	$ 17,428
Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income	56,694	53,534	110,906	103,313
Interest expense	4,894	3,714	8,980	7,010
Net interest income	51,800	49,820	101,926	96,303
Provision for loan losses	1,491	733	3,473	1,414
Noninterest income	12,954	13,018	25,967	25,753
Noninterest expense
Salaries and employee benefits	19,359	18,428	38,203	37,417
Equipment and occupancy expenses	5,427	5,901	10,684	11,051
Data processing and telecommunications expenses	6,378	5,685	12,421	11,505
Other expenses	10,209	11,071	19,450	27,507
Total noninterest expense	41,373	41,085	80,758	87,480
Income before income tax expense	21,890	21,020	43,662	33,162
Income tax expense	6,095	6,626	12,951	10,545
Net income	15,795	14,394	30,711	22,617
Total assets	6,186,980	5,691,976	6,186,980	5,691,976
Goodwill	125,532	121,422	125,532	121,422
Other intangible assets, net	15,378	20,574	15,378	20,574
Retail Mortgage Division [Member]
Segment Reporting Information [Line Items]
Interest income	4,974	3,293	9,028	6,313
Interest expense	1,504	739	2,582	1,329
Net interest income	3,470	2,554	6,446	4,984
Provision for loan losses	347	93	355	93
Noninterest income	13,053	13,304	23,566	22,928
Noninterest expense
Salaries and employee benefits	7,763	8,304	14,979	14,651
Equipment and occupancy expenses	610	405	1,129	893
Data processing and telecommunications expenses	440	338	757	610
Other expenses	888	1,133	2,029	2,089
Total noninterest expense	9,701	10,180	18,894	18,243
Income before income tax expense	6,475	5,585	10,763	9,576
Income tax expense	2,361	1,955	3,862	3,352
Net income	4,114	3,630	6,901	6,224
Total assets	475,599	306,932	475,599	306,932
Goodwill	0	0	0	0
Other intangible assets, net	0	0	0	0
Warehouse Lending Division [Member]
Segment Reporting Information [Line Items]
Interest income	1,613	1,622	2,946	2,641
Interest expense	359	141	587	233
Net interest income	1,254	1,481	2,359	2,408
Provision for loan losses	176	0	(56)	0
Noninterest income	438	440	757	773
Noninterest expense
Salaries and employee benefits	127	108	274	296
Equipment and occupancy expenses	1	1	2	2
Data processing and telecommunications expenses	25	25	52	45
Other expenses	54	26	86	51
Total noninterest expense	207	160	414	394
Income before income tax expense	1,309	1,761	2,758	2,787
Income tax expense	472	616	979	975
Net income	837	1,145	1,779	1,812
Total assets	174,149	150,823	174,149	150,823
Goodwill	0	0	0	0
Other intangible assets, net	0	0	0	0
SBA Division [Member]
Segment Reporting Information [Line Items]
Interest income	1,258	891	2,471	1,632
Interest expense	373	157	679	302
Net interest income	885	734	1,792	1,330
Provision for loan losses	51	63	99	63
Noninterest income	1,718	1,617	3,533	3,211
Noninterest expense
Salaries and employee benefits	890	691	1,481	1,354
Equipment and occupancy expenses	54	64	105	125
Data processing and telecommunications expenses	2	1	3	2
Other expenses	259	178	470	361
Total noninterest expense	1,205	934	2,059	1,842
Income before income tax expense	1,347	1,354	3,167	2,636
Income tax expense	472	474	1,109	923
Net income	875	880	2,058	1,713
Total assets	80,909	71,563	80,909	71,563
Goodwill	0	0	0	0
Other intangible assets, net	0	0	0	0
Premium Finance Division [Member]
Segment Reporting Information [Line Items]
Interest income	6,872	0	13,110	0
Interest expense	1,124	0	1,886	0
Net interest income	5,748	0	11,224	0
Provision for loan losses	140	0	170	0
Noninterest income	26	0	72	0
Noninterest expense
Salaries and employee benefits	993	0	1,989	0
Equipment and occupancy expenses	54	0	103	0
Data processing and telecommunications expenses	183	0	367	0
Other expenses	2,023	0	4,248	0
Total noninterest expense	3,253	0	6,707	0
Income before income tax expense	2,381	0	4,419	0
Income tax expense	915	0	1,628	0
Net income	1,466	0	2,791	0
Total assets	480,221	0	480,221	0
Goodwill	0	0	0	0
Other intangible assets, net	$ 0	$ 0	$ 0	$ 0