SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest income	$ 52,601	$ 51,195	$ 44,229	$ 42,368	$ 44,900	$ 43,186	$ 38,607	$ 37,873	$ 190,393	$ 164,566	$ 126,322
Interest expense	3,983	3,796	3,541	3,536	3,894	4,054	3,343	3,389	14,856	14,680	10,137
Net interest income	48,618	47,399	40,688	38,832	41,006	39,132	35,264	34,484	175,537	149,886	116,185
Provision for loan losses	553	986	2,656	1,069	888	1,669	1,365	1,726	5,264	5,648	11,486
Noninterest income	22,407	24,978	20,626	17,575	16,362	17,901	15,819	12,754	85,586	62,836	46,549
Noninterest expense:
Salaries and employee benefits									94,003	73,878	56,670
Equipment and occupancy expenses									21,195	17,521	12,286
Data processing and telecommunications expenses									19,849	15,551	11,539
Other expenses									64,068	43,919	41,450
Total noninterest expense	51,221	47,950	51,152	40,812	41,666	38,028	34,446	32,789	199,115	150,869	121,945
Income before income tax expense	17,444	22,995	1,794	14,511	14,747	16,785	12,400	12,273	56,744	56,205	29,303
Income tax expense	3,296	7,368	486	4,747	4,167	5,122	4,270	3,923	15,897	17,482	9,285
Net income	14,148	15,627	1,308	9,764	10,580	11,663	8,130	8,350	40,847	38,723	20,018
Less preferred stock dividends	0	0	0	0	0	0	0	286	0	286	1,738
Net income available to common shareholders	14,148	$ 15,627	$ 1,308	$ 9,764	10,580	$ 11,663	$ 8,130	$ 8,064	40,847	38,437	18,280
Total assets	5,588,940				4,037,077				5,588,940	4,037,077	3,667,649
Other intangible assets, net	17,058				8,221				17,058	8,221	6,009
Goodwill	90,082				63,547				90,082	63,547	35,049
Banking Division [Member]
Segment Reporting Information [Line Items]
Interest income									174,162	154,898	120,522
Interest expense									14,385	14,438	9,940
Net interest income									159,777	140,460	110,582
Provision for loan losses									4,847	4,822	11,486
Noninterest income									44,251	32,337	25,282
Noninterest expense:
Salaries and employee benefits									68,183	55,101	43,524
Equipment and occupancy expenses									19,320	16,097	11,599
Data processing and telecommunications expenses									18,681	14,436	10,957
Other expenses									59,636	39,175	36,850
Total noninterest expense									165,820	124,809	102,930
Income before income tax expense									33,361	43,166	21,448
Income tax expense									7,713	12,918	6,536
Net income									25,648	30,248	14,912
Less preferred stock dividends									0	286	1,738
Net income available to common shareholders									25,648	29,962	13,174
Total assets	5,166,045				3,751,503				5,166,045	3,751,503	3,506,954
Other intangible assets, net	17,058				8,221				17,058	8,221	6,009
Goodwill	90,082				63,547				90,082	63,547	35,049
Retail Mortgage Division [Member]
Segment Reporting Information [Line Items]
Interest income									8,821	5,344	3,162
Interest expense									0	0	0
Net interest income									8,821	5,344	3,162
Provision for loan losses									417	826	0
Noninterest income									34,498	24,959	18,967
Noninterest expense:
Salaries and employee benefits									22,112	15,918	12,341
Equipment and occupancy expenses									1,674	1,342	625
Data processing and telecommunications expenses									1,065	1,043	534
Other expenses									3,787	3,603	4,258
Total noninterest expense									28,638	21,906	17,758
Income before income tax expense									14,264	7,571	4,371
Income tax expense									4,992	2,650	1,530
Net income									9,272	4,921	2,841
Less preferred stock dividends									0	0	0
Net income available to common shareholders									9,272	4,921	2,841
Total assets	246,730				164,588				246,730	164,588	108,198
Other intangible assets, net	0				0				0	0	0
Goodwill	0				0				0	0	0
Warehouse Lending Division [Member]
Segment Reporting Information [Line Items]
Interest income									4,137	2,016	721
Interest expense									0	0	0
Net interest income									4,137	2,016	721
Provision for loan losses									0	0	0
Noninterest income									1,364	655	163
Noninterest expense:
Salaries and employee benefits									519	255	174
Equipment and occupancy expenses									7	1	6
Data processing and telecommunications expenses									95	54	39
Other expenses									123	392	128
Total noninterest expense									744	702	347
Income before income tax expense									4,757	1,969	537
Income tax expense									1,665	689	188
Net income									3,092	1,280	349
Less preferred stock dividends									0	0	0
Net income available to common shareholders									3,092	1,280	349
Total assets	101,893				58,502				101,893	58,502	14,229
Other intangible assets, net	0				0				0	0	0
Goodwill	0				0				0	0	0
SBA Division [Member]
Segment Reporting Information [Line Items]
Interest income									3,273	2,308	1,917
Interest expense									471	242	197
Net interest income									2,802	2,066	1,720
Provision for loan losses									0	0	0
Noninterest income									5,473	4,885	2,137
Noninterest expense:
Salaries and employee benefits									3,189	2,604	631
Equipment and occupancy expenses									194	81	56
Data processing and telecommunications expenses									8	18	9
Other expenses									522	749	214
Total noninterest expense									3,913	3,452	910
Income before income tax expense									4,362	3,499	2,947
Income tax expense									1,527	1,225	1,031
Net income									2,835	2,274	1,916
Less preferred stock dividends									0	0	0
Net income available to common shareholders									2,835	2,274	1,916
Total assets	74,272				62,484				74,272	62,484	38,268
Other intangible assets, net	0				0				0	0	0
Goodwill	$ 0				$ 0				$ 0	$ 0	$ 0