ACQUISITION OF CORNERSTONE BANCORP, INC. - CONTRIBUTION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
INTEREST INCOME:
Loans, including fees	$ 41,597	$ 34,040	$ 120,772	$ 99,247
Taxable investment securities	1,942	1,733	5,817	5,285
Federal Home Loan Bank stock and other	395	334	1,500	1,058
Total interest income	43,934	36,107	128,089	105,590
INTEREST EXPENSE:
Deposits	1,620	1,068	4,359	3,233
Subordinated note	241	616	680	1,874
Total interest expense	4,536	4,683	13,680	14,086
NET INTEREST INCOME	39,398	31,424	114,409	91,504
Provision for loan and lease losses	2,489	2,233	9,489	3,322
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	36,909	29,191	104,920	88,182
NONINTEREST INCOME:
Service charges on deposit accounts	3,416	3,399	9,838	9,685
Interchange fee income	2,415	1,967	6,755	6,205
Other	1,009	557	2,163	1,772
Total noninterest income	11,301	7,806	47,024	40,277
NONINTEREST EXPENSES:
Salaries and employee benefits	18,068	15,297	52,965	44,897
Occupancy and equipment, net	5,631	5,217	16,159	15,560
Communication and transportation	1,029	951	2,974	2,768
Marketing and development	1,076	756	2,773	2,318
FDIC insurance expense	345	474	1,483	1,622
Data processing	1,659	959	4,535	3,017
Supplies	280	229	969	809
Legal and professional fees	539	653	1,965	2,796
Other	1,938	1,801	5,904	5,264
Total noninterest expenses	33,534	28,238	97,941	86,477
INCOME BEFORE INCOME TAX EXPENSE	14,676	8,759	54,003	41,982
Income tax expense (benefit)	4,848	3,119	18,100	14,234
NET INCOME	9,828	$ 5,640	35,903	$ 27,748
Cornerstone
INTEREST INCOME:
Loans, including fees	2,382		3,437
Taxable investment securities	547		750
Total interest income	2,929		4,187
INTEREST EXPENSE:
Deposits	139		206
Borrowings	848		1,099
Subordinated note	25		37
Total interest expense	1,012		1,342
NET INTEREST INCOME	1,917		2,845
Provision for loan and lease losses	9		95
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	1,908		2,750
NONINTEREST INCOME:
Service charges on deposit accounts	86		123
Interchange fee income	57		76
Other	140		176
Total noninterest income	283		375
NONINTEREST EXPENSES:
Salaries and employee benefits	831		1,524
Occupancy and equipment, net	225		325
Communication and transportation	67		107
Marketing and development	100		127
FDIC insurance expense	11		30
Data processing	215		663
Supplies	24		51
Legal and professional fees	11		190
Other	197		296
Total noninterest expenses	1,681		3,313
INCOME BEFORE INCOME TAX EXPENSE	510		(188)
Income tax expense (benefit)	151		(60)
NET INCOME	359		(128)
Cornerstone | Non-Acquisition Related
INTEREST INCOME:
Loans, including fees	2,348		3,403
Taxable investment securities	547		750
Total interest income	2,895		4,153
INTEREST EXPENSE:
Deposits	144		215
Borrowings	848		1,099
Subordinated note	25		37
Total interest expense	1,017		1,351
NET INTEREST INCOME	1,878		2,802
Provision for loan and lease losses	9		95
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	1,869		2,707
NONINTEREST INCOME:
Service charges on deposit accounts	86		123
Interchange fee income	57		76
Other	140		176
Total noninterest income	283		375
NONINTEREST EXPENSES:
Salaries and employee benefits	831		1,250
Occupancy and equipment, net	225		325
Communication and transportation	67		97
Marketing and development	100		127
FDIC insurance expense	11		30
Data processing	3
Supplies	24		31
Legal and professional fees	11		40
Other	152		220
Total noninterest expenses	1,424		2,120
INCOME BEFORE INCOME TAX EXPENSE	728		962
Income tax expense (benefit)	218		288
NET INCOME	510		674
Cornerstone | Acquisition-Related
INTEREST INCOME:
Loans, including fees	34		34
Total interest income	34		34
INTEREST EXPENSE:
Deposits	(5)		(9)
Total interest expense	(5)		(9)
NET INTEREST INCOME	39		43
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	39		43
NONINTEREST EXPENSES:
Salaries and employee benefits			274
Communication and transportation			10
Data processing	212		663
Supplies			20
Legal and professional fees			150
Other	45		76
Total noninterest expenses	257		1,193
INCOME BEFORE INCOME TAX EXPENSE	(218)		(1,150)
Income tax expense (benefit)	(67)		(348)
NET INCOME	$ (151)		$ (802)