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ALLOWANCE FOR LOAN LOSSES - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Credit quality information
Loans and Leases Receivable, Allowance	$ 13,090		$ 13,090			$ 12,325
Total loans	2,485,066		2,485,066			2,485,613
Provision for loan losses	770	$ 736	1,565	$ 1,531
Special mention
Credit quality information
Total loans	16,322		16,322			16,360
Non-accrual
Credit quality information
Total loans	21,946		21,946			14,296
Substandard
Credit quality information
Total loans	17,484		17,484			18,117
Total classified
Credit quality information
Total loans	39,430		39,430			32,413
Total Criticized
Credit quality information
Total loans	55,752		55,752			48,773
Business Activities Loans
Credit quality information
Loans and Leases Receivable, Allowance	12,723	11,333	12,723	11,333	$ 12,414	12,153	$ 10,884	$ 10,419
Total loans	1,533,325		1,533,325			1,452,630
Total Performing and Nonperforming Loans	668,196		668,196			650,615
Charged-off loans	(399)	(213)	(653)	(557)
Recoveries on charged-off loans	52	35	72	49
Provision for loan losses	656	627	1,151	1,422
Individually evaluated for impairment	796	394	796	394
Collectively evaluated	11,927	10,939	11,927	10,939
Business Activities Loans | Commercial real estate
Credit quality information
Loans and Leases Receivable, Allowance	6,367	5,503	6,367	5,503	5,998	6,037	5,307	5,145
Total loans	568,302		568,302			534,011
Charged-off loans	(156)	(7)	(156)	(112)
Recoveries on charged-off loans	46	1	61	3
Provision for loan losses	479	202	425	467
Individually evaluated for impairment	682	380	682	380
Collectively evaluated	5,685	5,123	5,685	5,123
Business Activities Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	27,722		27,722			28,892
Business Activities Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	540,580		540,580			505,119
Business Activities Loans | Commercial and industrial
Credit quality information
Loans and Leases Receivable, Allowance	2,509	2,110	2,509	2,110	2,612	2,373	2,143	1,952
Total loans	296,827		296,827			268,004
Charged-off loans	(27)	(170)	(111)	(187)
Recoveries on charged-off loans	4	32	6	32
Provision for loan losses	(80)	105	241	313
Individually evaluated for impairment	34	4	34	4
Collectively evaluated	2,475	2,106	2,475	2,106
Business Activities Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	226,143		226,143			198,051
Business Activities Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	25,284		25,284			27,588
Business Activities Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	45,400		45,400			42,365
Business Activities Loans | Residential Real Estate
Credit quality information
Loans and Leases Receivable, Allowance	3,454	3,119	3,454	3,119	3,304	3,357	2,806	2,721
Total loans	606,128		606,128			591,411
Charged-off loans	0	(13)	0	(212)
Recoveries on charged-off loans	0	0	1	1
Provision for loan losses	150	326	96	609
Individually evaluated for impairment	80	10	80	10
Collectively evaluated	3,374	3,109	3,374	3,109
Business Activities Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	606,128		606,128			591,411
Total Performing and Nonperforming Loans	606,128		606,128			591,411
Business Activities Loans | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	53,853		53,853			51,376
Business Activities Loans | Consumer
Credit quality information
Loans and Leases Receivable, Allowance	393	601	393	601	500	386	628	601
Total loans	62,068		62,068			59,204
Total Performing and Nonperforming Loans	8,215		8,215			7,828
Charged-off loans	(216)	(23)	(386)	(46)
Recoveries on charged-off loans	2	2	4	13
Provision for loan losses	107	(6)	389	33
Individually evaluated for impairment	0	0	0	0
Collectively evaluated	393	601	393	601
Business Activities Loans | Consumer | Home equity
Credit quality information
Total loans	53,853		53,853			51,376
Business Activities Loans | Performing
Credit quality information
Total Performing and Nonperforming Loans	660,444		660,444			646,982
Business Activities Loans | Performing | Residential Real Estate | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	598,904		598,904			588,003
Business Activities Loans | Performing | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	53,413		53,413			51,246
Business Activities Loans | Performing | Consumer
Credit quality information
Total Performing and Nonperforming Loans	8,127		8,127			7,733
Business Activities Loans | Nonperforming
Credit quality information
Total Performing and Nonperforming Loans	7,752		7,752			3,633
Business Activities Loans | Nonperforming | Residential Real Estate | Residential real estate
Credit quality information
Total Performing and Nonperforming Loans	7,224		7,224			3,408
Business Activities Loans | Nonperforming | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	440		440			130
Business Activities Loans | Nonperforming | Consumer
Credit quality information
Total Performing and Nonperforming Loans	88		88			95
Business Activities Loans | Pass | Commercial real estate
Credit quality information
Total loans	545,400		545,400			511,891
Business Activities Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	27,647		27,647			28,180
Business Activities Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	517,753		517,753			483,711
Business Activities Loans | Pass | Commercial and industrial
Credit quality information
Total loans	292,825		292,825			263,401
Business Activities Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	222,898		222,898			194,147
Business Activities Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	24,684		24,684			27,046
Business Activities Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	45,243		45,243			42,208
Business Activities Loans | Special mention
Credit quality information
Total loans	8,792		8,792			7,932
Business Activities Loans | Special mention | Commercial real estate
Credit quality information
Total loans	7,212		7,212			5,779
Business Activities Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	73		73			73
Business Activities Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	7,139		7,139			5,706
Business Activities Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	1,580		1,580			2,153
Business Activities Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,355		1,355			1,933
Business Activities Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	68		68			63
Business Activities Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	157		157			157
Business Activities Loans | Non-accrual
Credit quality information
Total loans	17,965		17,965			12,140
Business Activities Loans | Substandard
Credit quality information
Total loans	7,901		7,901			10,284
Business Activities Loans | Substandard | Commercial real estate
Credit quality information
Total loans	15,690		15,690			16,341
Business Activities Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	2		2			639
Business Activities Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	15,688		15,688			15,702
Business Activities Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	2,422		2,422			2,450
Business Activities Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,890		1,890			1,971
Business Activities Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	532		532			479
Business Activities Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0		0			0
Business Activities Loans | Total classified
Credit quality information
Total loans	25,866		25,866			22,424
Business Activities Loans | Total Criticized
Credit quality information
Total loans	34,658		34,658			30,356
Acquired Loans
Credit quality information
Loans and Leases Receivable, Allowance	367	109	367	109	265	172	0	0
Total loans	951,741		951,741			1,032,983
Total Performing and Nonperforming Loans	578,031		578,031			628,829
Charged-off loans	(118)	0	(325)	0
Recoveries on charged-off loans	106	0	106	0
Provision for loan losses	114	109	414	109
Individually evaluated for impairment	77	109	77	109
Collectively evaluated	290	0	290	0
Acquired Loans | Commercial real estate
Credit quality information
Loans and Leases Receivable, Allowance	200	51	200	51	83	97	0	0
Total loans	270,244		270,244			292,735
Charged-off loans	0	0	(106)	0
Recoveries on charged-off loans	18	0	18	0
Provision for loan losses	99	51	191	51
Individually evaluated for impairment	0	51	0	51
Collectively evaluated	200	0	200	0
Acquired Loans | Commercial real estate | Construction and land development
Credit quality information
Total loans	9,542		9,542			16,781
Acquired Loans | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	260,702		260,702			275,954
Acquired Loans | Commercial and industrial
Credit quality information
Loans and Leases Receivable, Allowance	82	24	82	24	124	16	0	0
Total loans	103,466		103,466			111,419
Charged-off loans	(37)	0	(95)	0
Recoveries on charged-off loans	6	0	6	0
Provision for loan losses	(11)	24	155	24
Individually evaluated for impairment	77	24	77	24
Collectively evaluated	5	0	5	0
Acquired Loans | Commercial and industrial | Other Commercial
Credit quality information
Total loans	62,253		62,253			68,069
Acquired Loans | Commercial and industrial | Agricultural
Credit quality information
Total loans	0		0			0
Acquired Loans | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	41,213		41,213			43,350
Acquired Loans | Residential Real Estate
Credit quality information
Loans and Leases Receivable, Allowance	85	34	85	34	58	59	0	0
Total loans	521,767		521,767			564,271
Total Performing and Nonperforming Loans	521,767		521,767			564,271
Charged-off loans	(64)	0	(64)	0
Recoveries on charged-off loans	0	0	0	0
Provision for loan losses	91	34	90	34
Individually evaluated for impairment	0	34	0	34
Collectively evaluated	85	0	85	0
Acquired Loans | Residential Real Estate | Residential real estate
Credit quality information
Total loans	521,767		521,767			564,271
Acquired Loans | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	54,457		54,457			62,217
Acquired Loans | Consumer
Credit quality information
Loans and Leases Receivable, Allowance	0	0	0	0	$ 0	0	$ 0	$ 0
Total loans	56,264		56,264			64,558
Total Performing and Nonperforming Loans	1,807		1,807			2,341
Charged-off loans	(17)	0	(60)	0
Recoveries on charged-off loans	82	0	82	0
Provision for loan losses	(65)	0	(22)	0
Individually evaluated for impairment	0	0	0	0
Collectively evaluated	0	$ 0	0	$ 0
Acquired Loans | Consumer | Home equity
Credit quality information
Total loans	54,457		54,457			62,217
Acquired Loans | Performing
Credit quality information
Total Performing and Nonperforming Loans	574,152		574,152			626,799
Acquired Loans | Performing | Residential Real Estate
Credit quality information
Total Performing and Nonperforming Loans	518,067		518,067			562,516
Acquired Loans | Performing | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	54,291		54,291			62,000
Acquired Loans | Performing | Consumer
Credit quality information
Total Performing and Nonperforming Loans	1,794		1,794			2,283
Acquired Loans | Nonperforming
Credit quality information
Total Performing and Nonperforming Loans	3,879		3,879			2,030
Acquired Loans | Nonperforming | Residential Real Estate
Credit quality information
Total Performing and Nonperforming Loans	3,700		3,700			1,755
Acquired Loans | Nonperforming | Residential Real Estate | Home equity
Credit quality information
Total Performing and Nonperforming Loans	166		166			217
Acquired Loans | Nonperforming | Consumer
Credit quality information
Total Performing and Nonperforming Loans	13		13			58
Acquired Loans | Pass | Commercial real estate
Credit quality information
Total loans	260,677		260,677			283,000
Acquired Loans | Pass | Commercial real estate | Construction and land development
Credit quality information
Total loans	9,289		9,289			16,523
Acquired Loans | Pass | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	251,388		251,388			266,477
Acquired Loans | Pass | Commercial and industrial
Credit quality information
Total loans	95,818		95,818			103,650
Acquired Loans | Pass | Commercial and industrial | Other Commercial
Credit quality information
Total loans	54,605		54,605			60,300
Acquired Loans | Pass | Commercial and industrial | Agricultural
Credit quality information
Total loans	0		0			0
Acquired Loans | Pass | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	41,213		41,213			43,350
Acquired Loans | Special mention
Credit quality information
Total loans	7,530		7,530			8,428
Acquired Loans | Special mention | Commercial real estate
Credit quality information
Total loans	1,596		1,596			2,675
Acquired Loans | Special mention | Commercial real estate | Construction and land development
Credit quality information
Total loans	0		0			235
Acquired Loans | Special mention | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	1,596		1,596			2,440
Acquired Loans | Special mention | Commercial and industrial
Credit quality information
Total loans	5,934		5,934			5,753
Acquired Loans | Special mention | Commercial and industrial | Other Commercial
Credit quality information
Total loans	5,934		5,934			5,753
Acquired Loans | Special mention | Commercial and industrial | Agricultural
Credit quality information
Total loans	0		0			0
Acquired Loans | Special mention | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0		0			0
Acquired Loans | Non-accrual
Credit quality information
Total loans	3,981		3,981			2,156
Acquired Loans | Substandard
Credit quality information
Total loans	9,583		9,583			7,833
Acquired Loans | Substandard | Commercial real estate
Credit quality information
Total loans	7,971		7,971			7,060
Acquired Loans | Substandard | Commercial real estate | Construction and land development
Credit quality information
Total loans	253		253			23
Acquired Loans | Substandard | Commercial real estate | Commercial real estate other
Credit quality information
Total loans	7,718		7,718			7,037
Acquired Loans | Substandard | Commercial and industrial
Credit quality information
Total loans	1,714		1,714			2,016
Acquired Loans | Substandard | Commercial and industrial | Other Commercial
Credit quality information
Total loans	1,714		1,714			2,016
Acquired Loans | Substandard | Commercial and industrial | Agricultural
Credit quality information
Total loans	0		0			0
Acquired Loans | Substandard | Commercial and industrial | Tax exempt loans
Credit quality information
Total loans	0		0			0
Acquired Loans | Total classified
Credit quality information
Total loans	13,564		13,564			9,989
Acquired Loans | Total Criticized
Credit quality information
Total loans	$ 21,094		$ 21,094			$ 18,417

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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