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LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Credit quality information
Total loans	$ 2,485,613	$ 1,129,064
Special mention
Credit quality information
Total loans	16,342	8,669
Non-accrual
Credit quality information
Total loans	14,318	6,496
Substandard
Credit quality information
Total loans	18,117	20,368
Total classified
Credit quality information
Total loans	32,435	26,864
Total Criticized
Credit quality information
Total loans	48,777	35,533
Business Activities Loans
Credit quality information
Total loans	1,452,630	1,129,064
Business Activities Loans | Special mention
Credit quality information
Total loans	7,913	8,669
Business Activities Loans | Non-accrual
Credit quality information
Total loans	12,162	6,496
Business Activities Loans | Substandard
Credit quality information
Total loans	10,284	20,368
Business Activities Loans | Total classified
Credit quality information
Total loans	22,446	26,864
Business Activities Loans | Total Criticized
Credit quality information
Total loans	30,359	35,533
Business Activities Loans | Commercial real estate
Credit quality information
Total loans	534,011	418,119
Business Activities Loans | Commercial real estate | Pass
Credit quality information
Total loans	511,891	391,663
Business Activities Loans | Commercial real estate | Special mention
Credit quality information
Total loans	5,779	5,868
Business Activities Loans | Commercial real estate | Substandard
Credit quality information
Total loans	16,341	20,588
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	28,892	14,695
Business Activities Loans | Commercial real estate | Construction and land development | Pass
Credit quality information
Total loans	28,180	14,695
Business Activities Loans | Commercial real estate | Construction and land development | Special mention
Credit quality information
Total loans	73	0
Business Activities Loans | Commercial real estate | Construction and land development | Substandard
Credit quality information
Total loans	639	0
Business Activities Loans | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	505,119	403,424
Business Activities Loans | Commercial real estate | Other commercial real estate | Pass
Credit quality information
Total loans	483,711	376,968
Business Activities Loans | Commercial real estate | Other commercial real estate | Special mention
Credit quality information
Total loans	5,706	5,868
Business Activities Loans | Commercial real estate | Other commercial real estate | Substandard
Credit quality information
Total loans	15,702	20,588
Business Activities Loans | Commercial and industrial
Credit quality information
Total loans	268,004	151,240
Business Activities Loans | Commercial and industrial | Pass
Credit quality information
Total loans	263,401	145,926
Business Activities Loans | Commercial and industrial | Special mention
Credit quality information
Total loans	2,153	2,802
Business Activities Loans | Commercial and industrial | Substandard
Credit quality information
Total loans	2,450	2,512
Business Activities Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	198,051	103,586
Business Activities Loans | Commercial and industrial | Other Commercial | Pass
Credit quality information
Total loans	194,147	98,968
Business Activities Loans | Commercial and industrial | Other Commercial | Special mention
Credit quality information
Total loans	1,933	2,384
Business Activities Loans | Commercial and industrial | Other Commercial | Substandard
Credit quality information
Total loans	1,971	2,234
Business Activities Loans | Commercial and industrial | Agricultural and other loans to farmers
Credit quality information
Total loans	27,588	31,808
Business Activities Loans | Commercial and industrial | Agricultural and other loans to farmers | Pass
Credit quality information
Total loans	27,046	31,279
Business Activities Loans | Commercial and industrial | Agricultural and other loans to farmers | Special mention
Credit quality information
Total loans	63	251
Business Activities Loans | Commercial and industrial | Agricultural and other loans to farmers | Substandard
Credit quality information
Total loans	479	278
Business Activities Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	42,365	15,846
Business Activities Loans | Commercial and industrial | Tax exempt | Pass
Credit quality information
Total loans	42,208	15,679
Business Activities Loans | Commercial and industrial | Tax exempt | Special mention
Credit quality information
Total loans	157	167
Business Activities Loans | Commercial and industrial | Tax exempt | Substandard
Credit quality information
Total loans	0	0
Acquired Loans
Credit quality information
Total loans	1,032,983
Acquired Loans | Special mention
Credit quality information
Total loans	8,429	0
Acquired Loans | Non-accrual
Credit quality information
Total loans	2,156	0
Acquired Loans | Substandard
Credit quality information
Total loans	7,833	0
Acquired Loans | Total classified
Credit quality information
Total loans	9,989	0
Acquired Loans | Total Criticized
Credit quality information
Total loans	18,418	0
Acquired Loans | Commercial real estate
Credit quality information
Total loans	292,735	0
Acquired Loans | Commercial real estate | Pass
Credit quality information
Total loans	283,000	0
Acquired Loans | Commercial real estate | Special mention
Credit quality information
Total loans	2,675	0
Acquired Loans | Commercial real estate | Substandard
Credit quality information
Total loans	7,060	0
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	16,781	0
Acquired Loans | Commercial real estate | Construction and land development | Pass
Credit quality information
Total loans	16,523	0
Acquired Loans | Commercial real estate | Construction and land development | Special mention
Credit quality information
Total loans	235	0
Acquired Loans | Commercial real estate | Construction and land development | Substandard
Credit quality information
Total loans	23	0
Acquired Loans | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	275,954	0
Acquired Loans | Commercial real estate | Other commercial real estate | Pass
Credit quality information
Total loans	266,477	0
Acquired Loans | Commercial real estate | Other commercial real estate | Special mention
Credit quality information
Total loans	2,440	0
Acquired Loans | Commercial real estate | Other commercial real estate | Substandard
Credit quality information
Total loans	7,037	0
Acquired Loans | Commercial and industrial
Credit quality information
Total loans	111,419	0
Acquired Loans | Commercial and industrial | Pass
Credit quality information
Total loans	103,650	0
Acquired Loans | Commercial and industrial | Special mention
Credit quality information
Total loans	5,753	0
Acquired Loans | Commercial and industrial | Substandard
Credit quality information
Total loans	2,016	0
Acquired Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	68,069	0
Acquired Loans | Commercial and industrial | Other Commercial | Pass
Credit quality information
Total loans	60,300	0
Acquired Loans | Commercial and industrial | Other Commercial | Special mention
Credit quality information
Total loans	5,753	0
Acquired Loans | Commercial and industrial | Other Commercial | Substandard
Credit quality information
Total loans	2,016	0
Acquired Loans | Commercial and industrial | Agricultural and other loans to farmers
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Agricultural and other loans to farmers | Pass
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Agricultural and other loans to farmers | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Agricultural and other loans to farmers | Substandard
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	43,350	0
Acquired Loans | Commercial and industrial | Tax exempt | Pass
Credit quality information
Total loans	43,350	0
Acquired Loans | Commercial and industrial | Tax exempt | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Tax exempt | Substandard
Credit quality information
Total loans	$ 0	$ 0

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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