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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Credit quality information
Total loans	$ 2,526,959	$ 2,490,227
Special mention
Credit quality information
Total loans	14,041	21,736
Substandard
Credit quality information
Total loans	20,361	15,797
Doubtful
Credit quality information
Total loans	0	0
Non-accrual
Credit quality information
Total loans	16,599	18,235
Total classified
Credit quality information
Total loans	36,960	34,032
Total Criticized
Credit quality information
Total loans	51,001	55,768
Business Activities Loans
Credit quality information
Total loans	1,695,869	1,630,897
Business Activities Loans | Commercial real estate
Credit quality information
Total loans	579,933	579,734
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	34,782	23,754
Business Activities Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	545,151	555,980
Business Activities Loans | Commercial and industrial
Credit quality information
Total loans	325,003	313,662
Business Activities Loans | Commercial and industrial | Commercial
Credit quality information
Total loans	236,068	234,757
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	22,208	22,317
Business Activities Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	66,727	56,588
Business Activities Loans | Residential Real Estate
Credit quality information
Total loans	723,425	670,189
Business Activities Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	723,425	670,189
Business Activities Loans | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	790,933	737,501
Business Activities Loans | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	723,425	670,189
Business Activities Loans | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	58,696	57,898
Business Activities Loans | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	8,812	9,414
Business Activities Loans | Performing | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	786,667	732,952
Business Activities Loans | Performing | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	719,525	665,976
Business Activities Loans | Performing | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	58,417	57,652
Business Activities Loans | Performing | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	8,725	9,324
Business Activities Loans | Nonperforming | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	4,266	4,549
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	3,900	4,213
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	279	246
Business Activities Loans | Nonperforming | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	87	90
Business Activities Loans | Pass | Commercial real estate
Credit quality information
Total loans	558,482	556,066
Business Activities Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	34,708	23,680
Business Activities Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	523,774	532,386
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Total loans	316,736	304,621
Business Activities Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Total loans	228,384	226,353
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	21,625	21,680
Business Activities Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	66,727	56,588
Business Activities Loans | Special mention
Credit quality information
Total loans	8,839	15,337
Business Activities Loans | Special mention | Commercial real estate
Credit quality information
Total loans	7,016	8,392
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	6,943	8,319
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	1,823	6,945
Business Activities Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Total loans	1,632	6,730
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	191	215
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0	0
Business Activities Loans | Substandard
Credit quality information
Total loans	12,056	7,810
Business Activities Loans | Substandard | Commercial real estate
Credit quality information
Total loans	13,076	13,914
Business Activities Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	0	0
Business Activities Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	13,076	13,914
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	5,718	1,346
Business Activities Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Total loans	5,326	924
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	392	422
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	1,359	1,362
Business Activities Loans | Doubtful | Commercial real estate | Construction and land development
Credit quality information
Total loans	1	1
Business Activities Loans | Doubtful | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	1,358	1,361
Business Activities Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	726	750
Business Activities Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Total loans	726	750
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	13,089	14,111
Business Activities Loans | Total classified
Credit quality information
Total loans	25,145	21,921
Business Activities Loans | Total Criticized
Credit quality information
Total loans	33,984	37,258
Acquired Loans
Credit quality information
Total loans	831,090	859,330
Acquired Loans | Commercial real estate
Credit quality information
Total loans	241,634	246,965
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	2,851	2,890
Acquired Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	238,783	244,075
Acquired Loans | Commercial and industrial
Credit quality information
Total loans	84,934	91,208
Acquired Loans | Commercial and industrial | Commercial
Credit quality information
Total loans	46,909	52,470
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	38,025	38,738
Acquired Loans | Residential Real Estate
Credit quality information
Total loans	460,628	474,509
Acquired Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	460,628	474,509
Acquired Loans | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	504,522	521,157
Acquired Loans | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	460,628	474,509
Acquired Loans | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	42,683	45,291
Acquired Loans | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	1,211	1,357
Acquired Loans | Performing | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	500,890	516,943
Acquired Loans | Performing | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	457,195	470,497
Acquired Loans | Performing | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	42,485	45,090
Acquired Loans | Performing | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	1,210	1,356
Acquired Loans | Nonperforming | Total residential real estate and consumer
Credit quality information
Total Performing and Nonperforming Loans	3,632	4,214
Acquired Loans | Nonperforming | Total residential real estate and consumer | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	3,433	4,012
Acquired Loans | Nonperforming | Total residential real estate and consumer | Home equity
Credit quality information
Total Performing and Nonperforming Loans	198	201
Acquired Loans | Nonperforming | Total residential real estate and consumer | Other consumer
Credit quality information
Total Performing and Nonperforming Loans	1	1
Acquired Loans | Pass | Commercial real estate
Credit quality information
Total loans	233,326	239,019
Acquired Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	2,580	2,626
Acquired Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	230,746	236,393
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Total loans	79,857	84,858
Acquired Loans | Pass | Commercial and industrial | Commercial
Credit quality information
Total loans	41,832	46,120
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	38,025	38,738
Acquired Loans | Special mention
Credit quality information
Total loans	5,202	6,399
Acquired Loans | Special mention | Commercial real estate
Credit quality information
Total loans	1,632	1,574
Acquired Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	0	0
Acquired Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	1,632	1,574
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	3,570	4,825
Acquired Loans | Special mention | Commercial and industrial | Commercial
Credit quality information
Total loans	3,570	4,825
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	8,305	7,987
Acquired Loans | Substandard | Commercial real estate
Credit quality information
Total loans	6,676	6,273
Acquired Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	271	264
Acquired Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	6,405	6,009
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,156	1,222
Acquired Loans | Substandard | Commercial and industrial | Commercial
Credit quality information
Total loans	1,156	1,222
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	99
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	99
Acquired Loans | Doubtful | Commercial and industrial
Credit quality information
Total loans	351	303
Acquired Loans | Doubtful | Commercial and industrial | Commercial
Credit quality information
Total loans	351	303
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	3,510	4,124
Acquired Loans | Total classified
Credit quality information
Total loans	11,815	12,111
Acquired Loans | Total Criticized
Credit quality information
Total loans	$ 17,017	$ 18,510

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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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