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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Credit quality information
Total loans	$ 2,483,590	$ 2,485,613
Special mention
Credit quality information
Total loans	15,959	16,360
Substandard
Credit quality information
Total loans	16,232	18,117
Doubtful
Credit quality information
Total loans	0	0
Non-accrual
Credit quality information
Total loans	21,774	14,296
Total classified
Credit quality information
Total loans	38,006	32,413
Total Criticized
Credit quality information
Total loans	53,965	48,773
Business Activities Loans
Credit quality information
Total loans	1,587,172	1,452,630
Business Activities Loans | Commercial real estate
Credit quality information
Total loans	585,166	534,011
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	37,525	28,892
Business Activities Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	547,641	505,119
Business Activities Loans | Commercial and industrial
Credit quality information
Total loans	293,021	268,004
Business Activities Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	225,965	198,051
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	24,478	27,588
Business Activities Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	42,578	42,365
Business Activities Loans | Residential Real Estate
Credit quality information
Total loans	643,038	591,411
Business Activities Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	643,038	591,411
Business Activities Loans | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	708,985	650,615
Business Activities Loans | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	643,038	591,411
Business Activities Loans | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	55,538	51,376
Business Activities Loans | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	10,409	7,828
Business Activities Loans | Performing | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	701,127	646,982
Business Activities Loans | Performing | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	635,742	588,003
Business Activities Loans | Performing | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	55,076	51,246
Business Activities Loans | Performing | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	10,309	7,733
Business Activities Loans | Nonperforming | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	7,858	3,633
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	7,296	3,408
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	462	130
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	100	95
Business Activities Loans | Pass | Commercial real estate
Credit quality information
Total loans	560,745	511,891
Business Activities Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	37,451	28,180
Business Activities Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	523,294	483,711
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Total loans	288,981	263,401
Business Activities Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	222,673	194,147
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	23,887	27,046
Business Activities Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	42,421	42,208
Business Activities Loans | Special mention
Credit quality information
Total loans	10,875	7,932
Business Activities Loans | Special mention | Commercial real estate
Credit quality information
Total loans	9,083	5,779
Business Activities Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	73	73
Business Activities Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	9,010	5,706
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	1,792	2,153
Business Activities Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,496	1,933
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	139	63
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	157	157
Business Activities Loans | Substandard
Credit quality information
Total loans	7,635	10,284
Business Activities Loans | Substandard | Commercial real estate
Credit quality information
Total loans	13,070	16,341
Business Activities Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	1	639
Business Activities Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	13,069	15,702
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,479	2,450
Business Activities Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,027	1,971
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	452	479
Business Activities Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Business Activities Loans | Doubtful
Credit quality information
Total loans	0	0
Business Activities Loans | Doubtful | Commercial real estate
Credit quality information
Total loans	2,268	0
Business Activities Loans | Doubtful | Commercial real estate | Construction and land development
Credit quality information
Total loans	0	0
Business Activities Loans | Doubtful | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	2,268	0
Business Activities Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	769	0
Business Activities Loans | Doubtful | Commercial and industrial | Other Commercial
Credit quality information
Total loans	769	0
Business Activities Loans | Doubtful | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Business Activities Loans | Doubtful | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Business Activities Loans | Non-accrual
Credit quality information
Total loans	17,809	12,140
Business Activities Loans | Total classified
Credit quality information
Total loans	25,444	22,424
Business Activities Loans | Total Criticized
Credit quality information
Total loans	36,319	30,356
Acquired Loans
Credit quality information
Total loans	896,418	1,032,983
Acquired Loans | Commercial real estate
Credit quality information
Total loans	254,852	292,735
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	2,926	16,781
Acquired Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	251,926	275,954
Acquired Loans | Commercial and industrial
Credit quality information
Total loans	92,793	111,419
Acquired Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	53,541	68,069
Acquired Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	39,252	43,350
Acquired Loans | Residential Real Estate
Credit quality information
Total loans	497,481	564,271
Acquired Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	497,481	564,271
Acquired Loans | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	548,773	628,829
Acquired Loans | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	497,481	564,271
Acquired Loans | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	49,655	62,217
Acquired Loans | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	1,637	2,341
Acquired Loans | Performing | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	544,476	626,799
Acquired Loans | Performing | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	493,349	562,516
Acquired Loans | Performing | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	49,492	62,000
Acquired Loans | Performing | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	1,635	2,283
Acquired Loans | Nonperforming | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	4,297	2,030
Acquired Loans | Nonperforming | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	4,132	1,755
Acquired Loans | Nonperforming | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	163	217
Acquired Loans | Nonperforming | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	2	58
Acquired Loans | Pass | Commercial real estate
Credit quality information
Total loans	246,549	283,000
Acquired Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	2,667	16,523
Acquired Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	243,882	266,477
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Total loans	87,747	103,650
Acquired Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	48,495	60,300
Acquired Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	39,252	43,350
Acquired Loans | Special mention
Credit quality information
Total loans	5,084	8,428
Acquired Loans | Special mention | Commercial real estate
Credit quality information
Total loans	1,723	2,675
Acquired Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	0	235
Acquired Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	1,723	2,440
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	3,361	5,753
Acquired Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	3,361	5,753
Acquired Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Acquired Loans | Substandard
Credit quality information
Total loans	8,597	7,833
Acquired Loans | Substandard | Commercial real estate
Credit quality information
Total loans	6,580	7,060
Acquired Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	259	23
Acquired Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	6,321	7,037
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,382	2,016
Acquired Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,382	2,016
Acquired Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful | Commercial real estate
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful | Commercial real estate | Construction and land development
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	303	0
Acquired Loans | Doubtful | Commercial and industrial | Other Commercial
Credit quality information
Total loans	303	0
Acquired Loans | Doubtful | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Doubtful | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Acquired Loans | Non-accrual
Credit quality information
Total loans	3,965	2,156
Acquired Loans | Total classified
Credit quality information
Total loans	12,562	9,989
Acquired Loans | Total Criticized
Credit quality information
Total loans	$ 17,646	$ 18,417

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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