SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net interest income	$ 47,399		$ 39,132	$ 126,919	$ 108,880
Provision for loan losses	986	$ 888	1,669	4,711	4,760	$ 5,648
Noninterest income	24,978		17,901	63,179	46,474
Noninterest expense:
Salaries and employee benefits	24,934		20,226	68,031	54,562
Equipment and occupancy expenses	5,915		4,669	15,278	12,804
Data processing and telecommunications expenses	5,329		3,928	13,803	11,322
Other expenses	12,218		9,756	48,975	30,448
Total noninterest expense	48,396		38,579	146,087	109,136
Income before income tax expense	22,995		16,785	39,300	41,458
Income tax expense	7,368		5,122	12,601	13,315
Net income	15,627		11,663	26,699	28,143
Less preferred stock dividends	0		0	0	286
Net income available to common shareholders	15,627		11,663	26,699	27,857
Total assets	5,216,300	$ 4,037,077	3,999,408	5,216,300	3,999,408	$ 4,037,077
Intangible assets	105,919		67,993	105,919	67,993
Banking Division [Member]
Segment Reporting Information [Line Items]
Net interest income	43,044		36,142	115,689	102,415
Provision for loan losses	960		994	4,343	4,085
Noninterest income	13,470		8,932	31,512	23,742
Noninterest expense:
Salaries and employee benefits	17,921		14,819	48,958	40,905
Equipment and occupancy expenses	5,444		4,277	13,964	11,778
Data processing and telecommunications expenses	4,998		3,619	12,922	10,535
Other expenses	11,379		8,722	45,783	26,855
Total noninterest expense	39,742		31,437	121,627	90,073
Income before income tax expense	15,812		12,643	21,231	31,999
Income tax expense	4,854		3,672	6,277	10,004
Net income	10,958		8,971	14,954	21,995
Less preferred stock dividends	0		0	0	286
Net income available to common shareholders	10,958		8,971	14,954	21,709
Total assets	4,805,387		3,678,769	4,805,387	3,678,769
Intangible assets	105,919		67,993	105,919	67,993
Retail Mortgage Division [Member]
Segment Reporting Information [Line Items]
Net interest income	2,485		1,636	6,009	3,522
Provision for loan losses	26		675	368	675
Noninterest income	9,827		6,967	26,532	18,883
Noninterest expense:
Salaries and employee benefits	6,138		4,340	16,257	11,743
Equipment and occupancy expenses	397		368	1,173	969
Data processing and telecommunications expenses	308		285	799	728
Other expenses	662		735	2,744	2,764
Total noninterest expense	7,505		5,728	20,973	16,204
Income before income tax expense	4,781		2,200	11,200	5,526
Income tax expense	1,673		770	3,920	1,934
Net income	3,108		1,430	7,280	3,592
Less preferred stock dividends	0		0	0	0
Net income available to common shareholders	3,108		1,430	7,280	3,592
Total assets	216,640		176,812	216,640	176,812
Intangible assets	0		0	0	0
Warehouse Lending Division [Member]
Segment Reporting Information [Line Items]
Net interest income	1,128		711	3,142	1,264
Provision for loan losses	0		0	0	0
Noninterest income	372		168	1,028	418
Noninterest expense:
Salaries and employee benefits	137		69	363	171
Equipment and occupancy expenses	1		0	4	1
Data processing and telecommunications expenses	22		21	75	43
Other expenses	40		134	95	232
Total noninterest expense	200		224	537	447
Income before income tax expense	1,300		655	3,633	1,235
Income tax expense	455		229	1,272	432
Net income	845		426	2,361	803
Less preferred stock dividends	0		0	0	0
Net income available to common shareholders	845		426	2,361	803
Total assets	92,398		50,546	92,398	50,546
Intangible assets	0		0	0	0
SBA Division [Member]
Segment Reporting Information [Line Items]
Net interest income	742		643	2,079	1,679
Provision for loan losses	0		0	0	0
Noninterest income	1,309		1,834	4,107	3,431
Noninterest expense:
Salaries and employee benefits	738		998	2,453	1,743
Equipment and occupancy expenses	73		24	137	56
Data processing and telecommunications expenses	1		3	7	16
Other expenses	137		165	353	597
Total noninterest expense	949		1,190	2,950	2,412
Income before income tax expense	1,102		1,287	3,236	2,698
Income tax expense	386		450	1,133	944
Net income	716		837	2,103	1,754
Less preferred stock dividends	0		0	0	0
Net income available to common shareholders	716		837	2,103	1,754
Total assets	101,875		93,281	101,875	93,281
Intangible assets	$ 0		$ 0	$ 0	$ 0