SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Interest income	$ 62,210	$ 51,195	$ 176,109	$ 137,792
Interest expense	5,143	3,796	14,017	10,873
Net interest income	57,067	47,399	162,092	126,919
Provision for loan losses	811	986	2,381	4,711	$ 5,264
Noninterest income	28,864	24,978	81,529	63,179
Noninterest expense
Salaries and employee benefits	27,982	24,934	81,700	68,031
Equipment and occupancy expenses	5,989	5,915	18,060	15,278
Data processing and telecommunications expenses	6,185	5,329	18,347	13,803
Other expenses	13,043	12,218	43,051	48,975
Total noninterest expense	53,199	48,396	161,158	146,087
Income before income tax expense	31,921	22,995	80,082	39,300
Income tax expense	10,364	7,368	26,159	12,601
Net income	21,557	15,627	53,923	26,699
Total assets	6,493,495	5,216,300	6,493,495	5,216,300	5,588,940
Other intangible assets, net	18,472	18,218	18,472	18,218	17,058
Goodwill	122,545	87,701	122,545	87,701	$ 90,082
Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income	55,369	46,734	158,682	126,283
Interest expense	4,995	3,690	13,567	10,594
Net interest income	50,374	43,044	145,115	115,689
Provision for loan losses	57	960	1,471	4,343
Noninterest income	13,949	13,470	39,702	31,512
Noninterest expense
Salaries and employee benefits	18,323	17,921	55,740	48,958
Equipment and occupancy expenses	5,490	5,444	16,541	13,964
Data processing and telecommunications expenses	5,794	4,998	17,299	12,922
Other expenses	11,533	11,379	39,040	45,783
Total noninterest expense	41,140	39,742	128,620	121,627
Income before income tax expense	23,126	15,812	54,726	21,231
Income tax expense	7,286	4,854	17,285	6,277
Net income	15,840	10,958	37,441	14,954
Total assets	5,841,207	4,805,387	5,841,207	4,805,387
Other intangible assets, net	18,472	18,218	18,472	18,218
Goodwill	122,545	87,701	122,545	87,701
Retail Mortgage Division [Member]
Segment Reporting Information [Line Items]
Interest income	3,679	2,485	9,992	6,009
Interest expense	0	0	0	0
Net interest income	3,679	2,485	9,992	6,009
Provision for loan losses	447	26	540	368
Noninterest income	13,198	9,827	36,126	26,532
Noninterest expense
Salaries and employee benefits	8,940	6,138	23,591	16,257
Equipment and occupancy expenses	433	397	1,326	1,173
Data processing and telecommunications expenses	364	308	974	799
Other expenses	1,303	662	3,392	2,744
Total noninterest expense	11,040	7,505	29,283	20,973
Income before income tax expense	5,390	4,781	16,295	11,200
Income tax expense	1,887	1,673	5,703	3,920
Net income	3,503	3,108	10,592	7,280
Total assets	356,755	216,640	356,755	216,640
Other intangible assets, net	0	0	0	0
Goodwill	0	0	0	0
Warehouse Lending Division [Member]
Segment Reporting Information [Line Items]
Interest income	2,073	1,128	4,714	3,142
Interest expense	0	0	0	0
Net interest income	2,073	1,128	4,714	3,142
Provision for loan losses	94	0	94	0
Noninterest income	555	372	1,328	1,028
Noninterest expense
Salaries and employee benefits	103	137	399	363
Equipment and occupancy expenses	1	1	3	4
Data processing and telecommunications expenses	26	22	71	75
Other expenses	26	40	77	95
Total noninterest expense	156	200	550	537
Income before income tax expense	2,378	1,300	5,398	3,633
Income tax expense	832	455	1,889	1,272
Net income	1,546	845	3,509	2,361
Total assets	203,334	92,398	203,334	92,398
Other intangible assets, net	0	0	0	0
Goodwill	0	0	0	0
SBA Division [Member]
Segment Reporting Information [Line Items]
Interest income	1,089	848	2,721	2,358
Interest expense	148	106	450	279
Net interest income	941	742	2,271	2,079
Provision for loan losses	213	0	276	0
Noninterest income	1,162	1,309	4,373	4,107
Noninterest expense
Salaries and employee benefits	616	738	1,970	2,453
Equipment and occupancy expenses	65	73	190	137
Data processing and telecommunications expenses	1	1	3	7
Other expenses	181	137	542	353
Total noninterest expense	863	949	2,705	2,950
Income before income tax expense	1,027	1,102	3,663	3,236
Income tax expense	359	386	1,282	1,133
Net income	668	716	2,381	2,103
Total assets	92,199	101,875	92,199	101,875
Other intangible assets, net	0	0	0	0
Goodwill	$ 0	$ 0	$ 0	$ 0