LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Credit quality information
Total loans	$ 2,372,436	$ 1,129,064
Special mention
Credit quality information
Total loans	12,249	8,669
Substandard
Credit quality information
Total loans	29,481	20,368
Non Accrual
Credit quality information
Total loans	2,336	2,733
Classified
Credit quality information
Total loans	31,817	23,101
Criticized
Credit quality information
Total loans	44,066	31,770
Business Activities Loans
Credit quality information
Total loans	1,202,629	1,129,064
Business Activities Loans | Special mention
Credit quality information
Total loans	10,606	8,669
Business Activities Loans | Substandard
Credit quality information
Total loans	18,654	20,368
Business Activities Loans | Non Accrual
Credit quality information
Total loans	2,336	2,733
Business Activities Loans | Classified
Credit quality information
Total loans	20,990	23,101
Business Activities Loans | Criticized
Credit quality information
Total loans	31,596	31,770
Business Activities Loans | Commercial Real Estate
Credit quality information
Total loans	444,937	418,289
Business Activities Loans | Commercial Real Estate | Pass
Credit quality information
Total loans	418,829	391,833
Business Activities Loans | Commercial Real Estate | Special mention
Credit quality information
Total loans	7,706	5,868
Business Activities Loans | Commercial Real Estate | Substandard
Credit quality information
Total loans	18,402	20,588
Business Activities Loans | Commercial Real Estate | Construction and land development
Credit quality information
Total loans	8,315	14,695
Business Activities Loans | Commercial Real Estate | Construction and land development | Pass
Credit quality information
Total loans	7,586	14,695
Business Activities Loans | Commercial Real Estate | Construction and land development | Special mention
Credit quality information
Total loans	29	0
Business Activities Loans | Commercial Real Estate | Construction and land development | Substandard
Credit quality information
Total loans	700	0
Business Activities Loans | Commercial Real Estate | Commercial real estate other
Credit quality information
Total loans	436,622	403,594
Business Activities Loans | Commercial Real Estate | Commercial real estate other | Pass
Credit quality information
Total loans	411,243	377,138
Business Activities Loans | Commercial Real Estate | Commercial real estate other | Special mention
Credit quality information
Total loans	7,677	5,868
Business Activities Loans | Commercial Real Estate | Commercial real estate other | Substandard
Credit quality information
Total loans	17,702	20,588
Business Activities Loans | Commercial and Industrial Loans
Credit quality information
Total loans	184,186	151,240
Business Activities Loans | Commercial and Industrial Loans | Pass
Credit quality information
Total loans	178,697	145,926
Business Activities Loans | Commercial and Industrial Loans | Special mention
Credit quality information
Total loans	2,901	2,802
Business Activities Loans | Commercial and Industrial Loans | Substandard
Credit quality information
Total loans	2,588	2,512
Business Activities Loans | Commercial and Industrial Loans | Commercial other
Credit quality information
Total loans	120,302	103,586
Business Activities Loans | Commercial and Industrial Loans | Commercial other | Pass
Credit quality information
Total loans	115,679	98,968
Business Activities Loans | Commercial and Industrial Loans | Commercial other | Special mention
Credit quality information
Total loans	2,632	2,384
Business Activities Loans | Commercial and Industrial Loans | Commercial other | Substandard
Credit quality information
Total loans	1,991	2,234
Business Activities Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers
Credit quality information
Total loans	32,621	31,808
Business Activities Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Pass
Credit quality information
Total loans	31,922	31,279
Business Activities Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Special mention
Credit quality information
Total loans	102	251
Business Activities Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Substandard
Credit quality information
Total loans	597	278
Business Activities Loans | Commercial and Industrial Loans | Tax exempt loans
Credit quality information
Total loans	31,263	15,846
Business Activities Loans | Commercial and Industrial Loans | Tax exempt loans | Pass
Credit quality information
Total loans	31,096	15,679
Business Activities Loans | Commercial and Industrial Loans | Tax exempt loans | Special mention
Credit quality information
Total loans	167	167
Business Activities Loans | Commercial and Industrial Loans | Tax exempt loans | Substandard
Credit quality information
Total loans	0	0
Acquired Loans
Credit quality information
Total loans	1,169,807	0
Acquired Loans | Special mention
Credit quality information
Total loans	1,643	0
Acquired Loans | Substandard
Credit quality information
Total loans	10,827	0
Acquired Loans | Non Accrual
Credit quality information
Total loans	0	0
Acquired Loans | Classified
Credit quality information
Total loans	10,827	0
Acquired Loans | Criticized
Credit quality information
Total loans	12,470	0
Acquired Loans | Commercial Real Estate
Credit quality information
Total loans	334,897	0
Acquired Loans | Commercial Real Estate | Pass
Credit quality information
Total loans	323,270	0
Acquired Loans | Commercial Real Estate | Special mention
Credit quality information
Total loans	1,559	0
Acquired Loans | Commercial Real Estate | Substandard
Credit quality information
Total loans	10,068	0
Acquired Loans | Commercial Real Estate | Construction and land development
Credit quality information
Total loans	17,315	0
Acquired Loans | Commercial Real Estate | Construction and land development | Pass
Credit quality information
Total loans	16,845	0
Acquired Loans | Commercial Real Estate | Construction and land development | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Commercial Real Estate | Construction and land development | Substandard
Credit quality information
Total loans	470	0
Acquired Loans | Commercial Real Estate | Commercial real estate other
Credit quality information
Total loans	317,582	0
Acquired Loans | Commercial Real Estate | Commercial real estate other | Pass
Credit quality information
Total loans	306,425	0
Acquired Loans | Commercial Real Estate | Commercial real estate other | Special mention
Credit quality information
Total loans	1,559	0
Acquired Loans | Commercial Real Estate | Commercial real estate other | Substandard
Credit quality information
Total loans	9,598	0
Acquired Loans | Commercial and Industrial Loans
Credit quality information
Total loans	125,809	0
Acquired Loans | Commercial and Industrial Loans | Pass
Credit quality information
Total loans	124,966	0
Acquired Loans | Commercial and Industrial Loans | Special mention
Credit quality information
Total loans	83	0
Acquired Loans | Commercial and Industrial Loans | Substandard
Credit quality information
Total loans	760	0
Acquired Loans | Commercial and Industrial Loans | Commercial other
Credit quality information
Total loans	82,761	0
Acquired Loans | Commercial and Industrial Loans | Commercial other | Pass
Credit quality information
Total loans	81,918	0
Acquired Loans | Commercial and Industrial Loans | Commercial other | Special mention
Credit quality information
Total loans	83	0
Acquired Loans | Commercial and Industrial Loans | Commercial other | Substandard
Credit quality information
Total loans	760	0
Acquired Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers
Credit quality information
Total loans	643	0
Acquired Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Pass
Credit quality information
Total loans	643	0
Acquired Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and Industrial Loans | Agricultural and other loans to farmers | Substandard
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and Industrial Loans | Tax exempt loans
Credit quality information
Total loans	42,405	0
Acquired Loans | Commercial and Industrial Loans | Tax exempt loans | Pass
Credit quality information
Total loans	42,405	0
Acquired Loans | Commercial and Industrial Loans | Tax exempt loans | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and Industrial Loans | Tax exempt loans | Substandard
Credit quality information
Total loans	$ 0	$ 0