SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Interest income	$ 54,559	$ 42,368
Interest expense	4,123	3,536
Net interest income	50,436	38,832
Provision for loan losses	681	1,069	$ 5,264
Noninterest income	24,286	17,575
Noninterest expense:
Salaries and employee benefits	26,187	20,632
Equipment and occupancy expenses	5,700	4,554
Data processing and telecommunications expenses	6,113	4,260
Other expenses	17,600	11,381
Total noninterest expense	55,600	40,827
Income before income tax expense	18,441	14,511
Income tax expense	6,124	4,747
Net income	12,317	9,764
Total assets	6,097,771	4,152,904	5,588,940
Other intangible assets, net	21,892	7,591	17,058
Goodwill	121,512	63,547	$ 90,082
Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income	49,779	39,297
Interest expense	3,978	3,458
Net interest income	45,801	35,839
Provision for loan losses	681	927
Noninterest income	12,735	8,780
Noninterest expense:
Salaries and employee benefits	18,989	15,362
Equipment and occupancy expenses	5,150	4,144
Data processing and telecommunications expenses	5,820	4,011
Other expenses	16,436	10,356
Total noninterest expense	46,395	33,873
Income before income tax expense	11,460	9,819
Income tax expense	3,681	3,105
Net income	7,779	6,714
Total assets	5,634,850	3,839,417
Other intangible assets, net	21,892	7,591
Goodwill	121,512	63,547
Retail Mortgage Division [Member]
Segment Reporting Information [Line Items]
Interest income	3,020	1,545
Interest expense	0	0
Net interest income	3,020	1,545
Provision for loan losses	0	142
Noninterest income	9,624	7,610
Noninterest expense:
Salaries and employee benefits	6,347	4,527
Equipment and occupancy expenses	488	380
Data processing and telecommunications expenses	272	212
Other expenses	956	932
Total noninterest expense	8,063	6,051
Income before income tax expense	4,581	2,962
Income tax expense	1,603	1,037
Net income	2,978	1,925
Total assets	260,038	154,766
Other intangible assets, net	0	0
Goodwill	0	0
Warehouse Lending Division [Member]
Segment Reporting Information [Line Items]
Interest income	1,019	835
Interest expense	0	0
Net interest income	1,019	835
Provision for loan losses	0	0
Noninterest income	333	273
Noninterest expense:
Salaries and employee benefits	188	127
Equipment and occupancy expenses	1	2
Data processing and telecommunications expenses	20	33
Other expenses	25	36
Total noninterest expense	234	198
Income before income tax expense	1,118	910
Income tax expense	391	319
Net income	727	592
Total assets	137,461	89,711
Other intangible assets, net	0	0
Goodwill	0	0
SBA Division [Member]
Segment Reporting Information [Line Items]
Interest income	741	691
Interest expense	145	78
Net interest income	596	613
Provision for loan losses	0	0
Noninterest income	1,594	912
Noninterest expense:
Salaries and employee benefits	663	616
Equipment and occupancy expenses	61	28
Data processing and telecommunications expenses	1	4
Other expenses	183	57
Total noninterest expense	908	705
Income before income tax expense	1,282	820
Income tax expense	449	287
Net income	833	533
Total assets	65,422	69,010
Other intangible assets, net	0	0
Goodwill	$ 0	$ 0