LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses and Recorded Investment By Portfolio Segment - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for loan losses
Balance at the beginning of the period	$ 23,250	$ 27,609	$ 32,227
Provision charged to expense	1,625	1,500	4,534
Losses charged off	(7,392)	(11,018)	(12,502)
Recoveries	4,537	5,159	3,350
Balance at the end of the period	22,020	23,250	27,609
Allowance for loan losses
Ending Balance individually evaluated for impairment				$ 1,429	$ 1,050	$ 1,287
Ending Balance collectively evaluated for impairment				20,591	22,200
Total ending allowance balance	23,250	27,609	32,227	22,020	23,250	27,609
Loans
Ending Balance individually evaluated for impairment				18,989	36,309
Ending Balance collectively evaluated for impairment				2,136,403	1,921,456
Total ending loan balance excluding accrued interest				2,155,392	1,957,765
Accrued interest				5,878	5,605
Allowance that includes a probability of default for subject loans	1,583	2,426
Commercial
Allowance for loan losses
Balance at the beginning of the period	2,977	3,291	3,894
Provision charged to expense	4,010	(1,204)	208
Losses charged off	(978)	(241)	(1,152)
Recoveries	502	1,131	341
Balance at the end of the period	6,511	2,977	3,291
Allowance for loan losses
Ending Balance individually evaluated for impairment				92	162
Ending Balance collectively evaluated for impairment				6,419	2,815
Total ending allowance balance	2,977	3,291	3,894	6,511	2,977	3,291
Loans
Ending Balance individually evaluated for impairment				812	705
Ending Balance collectively evaluated for impairment				444,852	321,725
Total ending loan balance excluding accrued interest				445,664	322,430
Commercial Real Estate
Allowance for loan losses
Balance at the beginning of the period	15,605	20,210	24,157
Provision charged to expense	(6,118)	(1,284)	1,319
Losses charged off	(727)	(5,583)	(6,353)
Recoveries	1,942	2,262	1,087
Balance at the end of the period	10,702	15,605	20,210
Allowance for loan losses
Ending Balance individually evaluated for impairment				1,166	705
Ending Balance collectively evaluated for impairment				9,536	14,900
Total ending allowance balance	15,605	20,210	24,157	10,702	15,605	20,210
Loans
Ending Balance individually evaluated for impairment				8,909	24,722
Ending Balance collectively evaluated for impairment				916,975	855,146
Total ending loan balance excluding accrued interest				925,884	879,868
Residential
Allowance for loan losses
Balance at the beginning of the period	3,501	3,409	3,180
Provision charged to expense	2,115	1,977	1,928
Losses charged off	(2,094)	(2,295)	(2,349)
Recoveries	337	410	650
Balance at the end of the period	3,859	3,501	3,409
Allowance for loan losses
Ending Balance individually evaluated for impairment				171	183
Ending Balance collectively evaluated for impairment				3,688	3,318
Total ending allowance balance	3,501	3,409	3,180	3,859	3,501	3,409
Loans
Ending Balance individually evaluated for impairment				9,155	10,662
Ending Balance collectively evaluated for impairment				717,918	698,833
Total ending loan balance excluding accrued interest				727,073	709,495
Consumer
Allowance for loan losses
Balance at the beginning of the period	1,167	699	996
Provision charged to expense	1,618	2,011	1,079
Losses charged off	(3,593)	(2,899)	(2,648)
Recoveries	1,756	1,356	1,272
Balance at the end of the period	948	1,167	699
Allowance for loan losses
Ending Balance collectively evaluated for impairment				948	1,167
Total ending allowance balance	$ 1,167	$ 699	$ 996	948	1,167	$ 699
Loans
Ending Balance individually evaluated for impairment				113	220
Ending Balance collectively evaluated for impairment				56,658	45,752
Total ending loan balance excluding accrued interest				$ 56,771	$ 45,972