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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Credit quality information
Total loans	$ 2,708,691	$ 2,641,092
Total commercial real estate
Credit quality information
Total loans	1,045,635	930,661
Total commercial real estate | Construction and land development
Credit quality information
Total loans	89,118	34,290
Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	956,517	896,371
Commercial and industrial
Credit quality information
Total loans	522,510	423,291
Commercial and industrial | Commercial
Credit quality information
Total loans	438,370	298,764
Commercial and industrial | Agricultural
Credit quality information
Total loans	17,814	20,224
Commercial and industrial | Tax exempt
Credit quality information
Total loans	66,326	104,303
Special mention
Credit quality information
Total loans	12,917	16,230
Substandard
Credit quality information
Total loans	38,769	39,442
Non-accrual
Credit quality information
Total loans	14,408	11,550
Total classified
Credit quality information
Total loans	53,177	50,992
Total Criticized
Credit quality information
Total loans	66,094	67,222
Business Activities Loans
Credit quality information
Total loans	2,056,846	1,835,230
Business Activities Loans | Total commercial real estate
Credit quality information
Total loans	852,398	697,438
Business Activities Loans | Total commercial real estate | Construction and land development
Credit quality information
Total loans	86,927	31,387
Business Activities Loans | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	765,471	666,051
Business Activities Loans | Commercial and industrial
Credit quality information
Total loans	441,121	326,570
Business Activities Loans | Commercial and industrial | Commercial
Credit quality information
Total loans	381,512	239,692
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	17,658	20,018
Business Activities Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	41,951	66,860
Business Activities Loans | Residential real estate and consumer
Credit quality information
Total loans	763,327	811,222
Business Activities Loans | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	695,766	740,687
Business Activities Loans | Residential real estate and consumer | Home equity
Credit quality information
Total loans	58,344	59,368
Business Activities Loans | Residential real estate and consumer | Other consumer
Credit quality information
Total loans	9,217	11,167
Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	758,998	807,224
Business Activities Loans | Performing | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	691,902	737,325
Business Activities Loans | Performing | Residential real estate and consumer | Home equity
Credit quality information
Total loans	57,894	58,753
Business Activities Loans | Performing | Residential real estate and consumer | Other consumer
Credit quality information
Total loans	9,202	11,146
Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	4,329	3,998
Business Activities Loans | Nonperforming | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	3,864	3,362
Business Activities Loans | Nonperforming | Residential real estate and consumer | Home equity
Credit quality information
Total loans	450	615
Business Activities Loans | Nonperforming | Residential real estate and consumer | Other consumer
Credit quality information
Total loans	15	21
Business Activities Loans | Pass | Total commercial real estate
Credit quality information
Total loans	828,930	677,943
Business Activities Loans | Pass | Total commercial real estate | Construction and land development
Credit quality information
Total loans	86,716	31,057
Business Activities Loans | Pass | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	742,214	646,886
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Total loans	421,046	307,129
Business Activities Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Total loans	362,351	221,329
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	16,744	18,940
Business Activities Loans | Pass | Commercial and industrial | Tax exempt
Credit quality information
Total loans	41,951	66,860
Business Activities Loans | Special mention
Credit quality information
Total loans	10,988	8,525
Business Activities Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	6,722	5,483
Business Activities Loans | Special mention | Total commercial real estate | Construction and land development
Credit quality information
Total loans	0	0
Business Activities Loans | Special mention | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	6,722	5,483
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	4,266	3,042
Business Activities Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Total loans	4,066	2,744
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	200	298
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt
Credit quality information
Total loans	0	0
Business Activities Loans | Substandard
Credit quality information
Total loans	29,121	26,055
Business Activities Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	15,981	12,304
Business Activities Loans | Substandard | Total commercial real estate | Construction and land development
Credit quality information
Total loans		330
Business Activities Loans | Substandard | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	15,981	11,974
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	14,919	15,646
Business Activities Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Total loans	14,430	14,866
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	489	780
Business Activities Loans | Substandard | Commercial and industrial | Tax exempt
Credit quality information
Total loans	0	0
Business Activities Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	765	1,708
Business Activities Loans | Doubtful | Total commercial real estate | Construction and land development
Credit quality information
Total loans	211	0
Business Activities Loans | Doubtful | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	554	1,708
Business Activities Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	890	753
Business Activities Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Total loans	665	753
Business Activities Loans | Doubtful | Commercial and industrial | Agricultural
Credit quality information
Total loans	225	0
Business Activities Loans | Doubtful | Commercial and industrial | Tax exempt
Credit quality information
Total loans	0	0
Business Activities Loans | Non-accrual
Credit quality information
Total loans	7,763	8,354
Business Activities Loans | Total classified
Credit quality information
Total loans	36,884	34,409
Business Activities Loans | Total Criticized
Credit quality information
Total loans	47,872	42,934
Business Activities Loans | Total Criticized | Total commercial real estate
Credit quality information
Total loans	852,398	697,438
Business Activities Loans | Total Criticized | Total commercial real estate | Construction and land development
Credit quality information
Total loans	86,927	31,387
Business Activities Loans | Total Criticized | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	765,471	666,051
Business Activities Loans | Total Criticized | Commercial and industrial
Credit quality information
Total loans	441,121	326,570
Business Activities Loans | Total Criticized | Commercial and industrial | Commercial
Credit quality information
Total loans	381,512	239,692
Business Activities Loans | Total Criticized | Commercial and industrial | Agricultural
Credit quality information
Total loans	17,658	20,018
Business Activities Loans | Total Criticized | Commercial and industrial | Tax exempt
Credit quality information
Total loans	41,951	66,860
Acquired Loans
Credit quality information
Total loans	651,845	805,862
Acquired Loans | Total commercial real estate
Credit quality information
Total loans	193,237	233,223
Acquired Loans | Total commercial real estate | Construction and land development
Credit quality information
Total loans	2,191	2,903
Acquired Loans | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	191,046	230,320
Acquired Loans | Commercial and industrial
Credit quality information
Total loans	81,389	96,721
Acquired Loans | Commercial and industrial | Commercial
Credit quality information
Total loans	56,858	59,072
Acquired Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	156	206
Acquired Loans | Commercial and industrial | Tax exempt
Credit quality information
Total loans	24,375	37,443
Acquired Loans | Residential real estate and consumer
Credit quality information
Total loans	377,219	475,918
Acquired Loans | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	325,440	411,170
Acquired Loans | Residential real estate and consumer | Home equity
Credit quality information
Total loans	50,530	63,033
Acquired Loans | Residential real estate and consumer | Other consumer
Credit quality information
Total loans	1,249	1,715
Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total loans	372,080	472,022
Acquired Loans | Performing | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	320,772	407,811
Acquired Loans | Performing | Residential real estate and consumer | Home equity
Credit quality information
Total loans	50,059	62,504
Acquired Loans | Performing | Residential real estate and consumer | Other consumer
Credit quality information
Total loans	1,249	1,707
Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total loans	5,139	3,896
Acquired Loans | Nonperforming | Residential real estate and consumer | Residential mortgages
Credit quality information
Total loans	4,668	3,359
Acquired Loans | Nonperforming | Residential real estate and consumer | Home equity
Credit quality information
Total loans	471	529
Acquired Loans | Nonperforming | Residential real estate and consumer | Other consumer
Credit quality information
Total loans		8
Acquired Loans | Pass | Total commercial real estate
Credit quality information
Total loans	182,480	220,903
Acquired Loans | Pass | Total commercial real estate | Construction and land development
Credit quality information
Total loans	1,878	2,412
Acquired Loans | Pass | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	180,602	218,491
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Total loans	79,063	88,649
Acquired Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Total loans	54,667	51,184
Acquired Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	21	58
Acquired Loans | Pass | Commercial and industrial | Tax exempt
Credit quality information
Total loans	24,375	37,407
Acquired Loans | Special mention
Credit quality information
Total loans	1,929	7,705
Acquired Loans | Special mention | Total commercial real estate
Credit quality information
Total loans	1,508	2,273
Acquired Loans | Special mention | Total commercial real estate | Construction and land development
Credit quality information
Total loans		12
Acquired Loans | Special mention | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	1,508	2,261
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	421	5,432
Acquired Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Total loans	421	5,432
Acquired Loans | Substandard
Credit quality information
Total loans	9,648	13,387
Acquired Loans | Substandard | Total commercial real estate
Credit quality information
Total loans	7,724	9,879
Acquired Loans | Substandard | Total commercial real estate | Construction and land development
Credit quality information
Total loans	313	479
Acquired Loans | Substandard | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	7,411	9,400
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,390	2,299
Acquired Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Total loans	1,255	2,115
Acquired Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	135	148
Acquired Loans | Substandard | Commercial and industrial | Tax exempt
Credit quality information
Total loans		36
Acquired Loans | Doubtful | Total commercial real estate
Credit quality information
Total loans	1,525	168
Acquired Loans | Doubtful | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	1,525	168
Acquired Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	515	341
Acquired Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Total loans	515	341
Acquired Loans | Non-accrual
Credit quality information
Total loans	6,645	3,196
Acquired Loans | Total classified
Credit quality information
Total loans	16,293	16,583
Acquired Loans | Total classified | Total commercial real estate
Credit quality information
Total loans	193,237	233,223
Acquired Loans | Total classified | Total commercial real estate | Construction and land development
Credit quality information
Total loans	2,191	2,903
Acquired Loans | Total classified | Total commercial real estate | Other commercial real estate
Credit quality information
Total loans	191,046	230,320
Acquired Loans | Total classified | Commercial and industrial
Credit quality information
Total loans	81,389	96,721
Acquired Loans | Total classified | Commercial and industrial | Commercial
Credit quality information
Total loans	56,858	59,072
Acquired Loans | Total classified | Commercial and industrial | Agricultural
Credit quality information
Total loans	156	206
Acquired Loans | Total classified | Commercial and industrial | Tax exempt
Credit quality information
Total loans	24,375	37,443
Acquired Loans | Total Criticized
Credit quality information
Total loans	$ 18,222	$ 24,288

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&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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