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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Credit quality information
Loans	$ 2,577,306	$ 2,490,227
Special mention
Credit quality information
Loans	31,305	21,736
Substandard
Credit quality information
Loans	16,592	15,797
Doubtful
Credit quality information
Loans	0	0
Non-accrual
Credit quality information
Loans	16,679	18,235
Total classified
Credit quality information
Loans	33,271	34,032
Total Criticized
Credit quality information
Loans	64,576	55,768
Business Activities Loans
Credit quality information
Loans	1,828,136	1,630,897
Business Activities Loans | Commercial real estate
Credit quality information
Loans	701,687	579,734
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Loans	28,802	23,754
Business Activities Loans | Commercial real estate | Commercial real estate other
Credit quality information
Loans	672,885	555,980
Business Activities Loans | Commercial and industrial
Credit quality information
Loans	327,143	313,662
Business Activities Loans | Commercial and industrial | Commercial
Credit quality information
Loans	239,894	234,757
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Loans	21,206	22,317
Business Activities Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	66,043	56,588
Business Activities Loans | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	799,306	737,501
Business Activities Loans | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	730,516	670,189
Business Activities Loans | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	58,556	57,898
Business Activities Loans | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	10,234	9,414
Business Activities Loans | Performing | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	795,440	732,952
Business Activities Loans | Performing | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	727,239	665,976
Business Activities Loans | Performing | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	57,992	57,652
Business Activities Loans | Performing | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	10,209	9,324
Business Activities Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	3,866	4,549
Business Activities Loans | Nonperforming | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	3,277	4,213
Business Activities Loans | Nonperforming | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	564	246
Business Activities Loans | Nonperforming | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	25	90
Business Activities Loans | Pass | Commercial real estate
Credit quality information
Loans	675,803	556,066
Business Activities Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Loans	28,728	23,680
Business Activities Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Loans	647,075	532,386
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Loans	306,418	304,621
Business Activities Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Loans	219,962	226,353
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Loans	20,413	21,680
Business Activities Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	66,043	56,588
Business Activities Loans | Special mention
Credit quality information
Loans	26,820	15,337
Business Activities Loans | Special mention | Commercial real estate
Credit quality information
Loans	12,474	8,392
Business Activities Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Loans	0	73
Business Activities Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Loans	12,474	8,319
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Loans	14,346	6,945
Business Activities Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Loans	14,000	6,730
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Loans	346	215
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Business Activities Loans | Substandard
Credit quality information
Loans	10,114	7,810
Business Activities Loans | Substandard | Commercial real estate
Credit quality information
Loans	10,285	13,914
Business Activities Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Loans	73	0
Business Activities Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Loans	10,212	13,914
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Loans	5,369	1,346
Business Activities Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Loans	4,922	924
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Loans	447	422
Business Activities Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Business Activities Loans | Doubtful
Credit quality information
Loans	0	0
Business Activities Loans | Doubtful | Commercial real estate
Credit quality information
Loans	3,125	1,362
Business Activities Loans | Doubtful | Commercial real estate | Construction and land development
Credit quality information
Loans	1	1
Business Activities Loans | Doubtful | Commercial real estate | Commercial real estate other
Credit quality information
Loans	3,124	1,361
Business Activities Loans | Doubtful | Commercial and industrial
Credit quality information
Loans	1,010	750
Business Activities Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Loans	1,010	750
Business Activities Loans | Doubtful | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Business Activities Loans | Doubtful | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Business Activities Loans | Non-accrual
Credit quality information
Loans	13,541	14,111
Business Activities Loans | Total classified
Credit quality information
Loans	23,655	21,921
Business Activities Loans | Total Criticized
Credit quality information
Loans	50,475	37,258
Acquired Loans
Credit quality information
Loans	749,170	859,330
Acquired Loans | Commercial real estate
Credit quality information
Loans	222,086	246,965
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Loans	2,064	2,890
Acquired Loans | Commercial real estate | Commercial real estate other
Credit quality information
Loans	220,022	244,075
Acquired Loans | Commercial and industrial
Credit quality information
Loans	75,563	91,208
Acquired Loans | Commercial and industrial | Commercial
Credit quality information
Loans	40,490	52,470
Acquired Loans | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Acquired Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	35,073	38,738
Acquired Loans | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	451,521	521,157
Acquired Loans | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	412,936	474,509
Acquired Loans | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	37,600	45,291
Acquired Loans | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	985	1,357
Acquired Loans | Performing | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	448,261	516,943
Acquired Loans | Performing | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	409,830	470,497
Acquired Loans | Performing | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	37,446	45,090
Acquired Loans | Performing | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	985	1,356
Acquired Loans | Nonperforming | Residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	3,260	4,214
Acquired Loans | Nonperforming | Residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	3,106	4,012
Acquired Loans | Nonperforming | Residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	154	201
Acquired Loans | Nonperforming | Residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	0	1
Acquired Loans | Pass | Commercial real estate
Credit quality information
Loans	214,624	239,019
Acquired Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Loans	1,765	2,626
Acquired Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Loans	212,859	236,393
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Loans	72,184	84,858
Acquired Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Loans	37,111	46,120
Acquired Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Acquired Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	35,073	38,738
Acquired Loans | Special mention
Credit quality information
Loans	4,485	6,399
Acquired Loans | Special mention | Commercial real estate
Credit quality information
Loans	1,974	1,574
Acquired Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Loans	12	0
Acquired Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Loans	1,962	1,574
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Loans	2,511	4,825
Acquired Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Loans	2,511	4,825
Acquired Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Acquired Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Acquired Loans | Substandard
Credit quality information
Loans	6,478	7,987
Acquired Loans | Substandard | Commercial real estate
Credit quality information
Loans	5,320	6,273
Acquired Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Loans	287	264
Acquired Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Loans	5,033	6,009
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Loans	527	1,222
Acquired Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Loans	527	1,222
Acquired Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Acquired Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Acquired Loans | Doubtful
Credit quality information
Loans	0	0
Acquired Loans | Doubtful | Commercial real estate
Credit quality information
Loans	168	99
Acquired Loans | Doubtful | Commercial real estate | Construction and land development
Credit quality information
Loans	0	0
Acquired Loans | Doubtful | Commercial real estate | Commercial real estate other
Credit quality information
Loans	168	99
Acquired Loans | Doubtful | Commercial and industrial
Credit quality information
Loans	341	303
Acquired Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Loans	341	303
Acquired Loans | Doubtful | Commercial and industrial | Agricultural
Credit quality information
Loans	0	0
Acquired Loans | Doubtful | Commercial and industrial | Tax exempt loans
Credit quality information
Loans	0	0
Acquired Loans | Non-accrual
Credit quality information
Loans	3,138	4,124
Acquired Loans | Total classified
Credit quality information
Loans	9,616	12,111
Acquired Loans | Total Criticized
Credit quality information
Loans	$ 14,101	$ 18,510

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