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LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Credit quality information
Total loans	$ 2,464,419	$ 2,485,613
Special mention
Credit quality information
Total loans	17,780	16,360
Non-accrual
Credit quality information
Total loans	20,339	14,296
Substandard
Credit quality information
Total loans	14,133	18,117
Total classified
Credit quality information
Total loans	34,472	32,413
Total Criticized
Credit quality information
Total loans	52,252	48,773
Business Activities Loans
Credit quality information
Total loans	1,471,016	1,452,630
Total Performing and Nonperforming Loans	648,145	650,615
Business Activities Loans | Commercial real estate
Credit quality information
Total loans	543,166	534,011
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	31,073	28,892
Business Activities Loans | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	512,093	505,119
Business Activities Loans | Commercial and industrial
Credit quality information
Total loans	279,705	268,004
Business Activities Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	210,304	198,051
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	26,309	27,588
Business Activities Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	43,092	42,365
Business Activities Loans | Residential Real Estate
Credit quality information
Total loans	588,465	591,411
Business Activities Loans | Residential Real Estate | Real estate
Credit quality information
Total loans	588,465	591,411
Total Performing and Nonperforming Loans	588,465	591,411
Business Activities Loans | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	52,100	51,376
Business Activities Loans | Consumer
Credit quality information
Total loans	59,680	59,204
Total Performing and Nonperforming Loans	7,580	7,828
Business Activities Loans | Consumer | Home equity
Credit quality information
Total loans	52,100	51,376
Business Activities Loans | Performing
Credit quality information
Total Performing and Nonperforming Loans	640,885	646,982
Business Activities Loans | Performing | Residential Real Estate | Real estate
Credit quality information
Total Performing and Nonperforming Loans	581,938	588,003
Business Activities Loans | Performing | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	51,476	51,246
Business Activities Loans | Performing | Consumer
Credit quality information
Total Performing and Nonperforming Loans	7,471	7,733
Business Activities Loans | Nonperforming
Credit quality information
Total Performing and Nonperforming Loans	7,260	3,633
Business Activities Loans | Nonperforming | Residential Real Estate | Real estate
Credit quality information
Total Performing and Nonperforming Loans	6,527	3,408
Business Activities Loans | Nonperforming | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	624	130
Business Activities Loans | Nonperforming | Consumer
Credit quality information
Total Performing and Nonperforming Loans	109	95
Business Activities Loans | Pass | Commercial real estate
Credit quality information
Total loans	520,135	511,891
Business Activities Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	30,433	28,180
Business Activities Loans | Pass | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	489,702	483,711
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Total loans	274,852	263,401
Business Activities Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	206,217	194,147
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	25,700	27,046
Business Activities Loans | Pass | Commercial and industrial | Tax exempt
Credit quality information
Total loans	42,935	42,208
Business Activities Loans | Special mention
Credit quality information
Total loans	10,153	7,932
Business Activities Loans | Special mention | Commercial real estate
Credit quality information
Total loans	7,813	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 | Other commercial real estate
Credit quality information
Total loans	7,740	5,706
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	2,340	2,153
Business Activities Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	2,115	1,933
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	68	63
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt
Credit quality information
Total loans	157	157
Business Activities Loans | Non-accrual
Credit quality information
Total loans	17,003	12,140
Business Activities Loans | Substandard
Credit quality information
Total loans	7,988	10,284
Business Activities Loans | Substandard | Commercial real estate
Credit quality information
Total loans	15,218	16,341
Business Activities Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	567	639
Business Activities Loans | Substandard | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	14,651	15,702
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	2,513	2,450
Business Activities Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,972	1,971
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	541	479
Business Activities Loans | Substandard | Commercial and industrial | Tax exempt
Credit quality information
Total loans	0	0
Business Activities Loans | Total classified
Credit quality information
Total loans	24,991	22,424
Business Activities Loans | Total Criticized
Credit quality information
Total loans	35,144	30,356
Acquired Loans
Credit quality information
Total loans	993,403	1,032,983
Total Performing and Nonperforming Loans	604,350	628,829
Acquired Loans | Commercial real estate
Credit quality information
Total loans	281,555	292,735
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	14,800	16,781
Acquired Loans | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	266,755	275,954
Acquired Loans | Commercial and industrial
Credit quality information
Total loans	107,500	111,419
Acquired Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	65,198	68,069
Acquired Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	42,302	43,350
Acquired Loans | Residential Real Estate
Credit quality information
Total loans	544,512	564,271
Total Performing and Nonperforming Loans	544,513	564,271
Acquired Loans | Residential Real Estate | Real estate
Credit quality information
Total loans	544,512	564,271
Acquired Loans | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	57,767	62,217
Acquired Loans | Consumer
Credit quality information
Total loans	59,836	64,558
Total Performing and Nonperforming Loans	2,070	2,341
Acquired Loans | Consumer | Home equity
Credit quality information
Total loans	57,766	62,217
Acquired Loans | Performing
Credit quality information
Total Performing and Nonperforming Loans	600,969	626,799
Acquired Loans | Performing | Residential Real Estate
Credit quality information
Total Performing and Nonperforming Loans	541,464	562,516
Acquired Loans | Performing | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	57,490	62,000
Acquired Loans | Performing | Consumer
Credit quality information
Total Performing and Nonperforming Loans	2,015	2,283
Acquired Loans | Nonperforming
Credit quality information
Total Performing and Nonperforming Loans	3,381	2,030
Acquired Loans | Nonperforming | Residential Real Estate
Credit quality information
Total Performing and Nonperforming Loans	3,049	1,755
Acquired Loans | Nonperforming | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	277	217
Acquired Loans | Nonperforming | Consumer
Credit quality information
Total Performing and Nonperforming Loans	55	58
Acquired Loans | Pass | Commercial real estate
Credit quality information
Total loans	271,242	283,000
Acquired Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	14,436	16,523
Acquired Loans | Pass | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	256,806	266,477
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Total loans	100,501	103,650
Acquired Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	58,199	60,300
Acquired Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Pass | Commercial and industrial | Tax exempt
Credit quality information
Total loans	42,302	43,350
Acquired Loans | Special mention
Credit quality information
Total loans	7,627	8,428
Acquired Loans | Special mention | Commercial real estate
Credit quality information
Total loans	2,624	2,675
Acquired Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	81	235
Acquired Loans | Special mention | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	2,543	2,440
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	5,003	5,753
Acquired Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	5,003	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
Credit quality information
Total loans	0	0
Acquired Loans | Non-accrual
Credit quality information
Total loans	3,336	2,156
Acquired Loans | Substandard
Credit quality information
Total loans	6,145	7,833
Acquired Loans | Substandard | Commercial real estate
Credit quality information
Total loans	7,689	7,060
Acquired Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	283	23
Acquired Loans | Substandard | Commercial real estate | Other commercial real estate
Credit quality information
Total loans	7,406	7,037
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,996	2,016
Acquired Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,996	2,016
Acquired Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	0	0
Acquired Loans | Substandard | Commercial and industrial | Tax exempt
Credit quality information
Total loans	0	0
Acquired Loans | Total classified
Credit quality information
Total loans	9,481	9,989
Acquired Loans | Total Criticized
Credit quality information
Total loans	$ 17,108	$ 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.

+ 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 4
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
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