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LOANS - Summary of Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Business Activities Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	$ 31,879	$ 28,556
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	65,627	38,090
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	294	197
Business Activities Loans | Commercial real estate loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	19,226	23,272
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	38,904	31,708
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	20	9
Business Activities Loans | Commercial real estate loans | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	18,676	22,606
With an allowance recorded	550	666
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	37,493	31,038
With an allowance recorded	1,411	670
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	20	9
Business Activities Loans | Commercial and industrial
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	8,971	2,835
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	22,240	3,801
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	122	49
Business Activities Loans | Commercial and industrial | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	4,805	1,584
With an allowance recorded	4,166	1,251
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	10,104	2,566
With an allowance recorded	12,136	1,235
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	122	49
Business Activities Loans | Residential
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	3,048	2,106
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	3,623	2,220
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	109	128
Business Activities Loans | Residential | 1-4 family
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	433	443
With an allowance recorded	2,615	1,663
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	699	441
With an allowance recorded	2,924	1,779
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	109	128
Business Activities Loans | Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	634	343
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	860	361
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	43	11
Business Activities Loans | Consumer | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With an allowance recorded	8	13
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With an allowance recorded	8	13
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	1	1
Business Activities Loans | Consumer | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	32	230
With an allowance recorded	594	100
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	238	242
With an allowance recorded	614	106
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	42	10
Acquired Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	5,650	5,758
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	9,040	9,523
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	118	97
Acquired Loans | Commercial real estate loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	4,233	3,980
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	7,071	6,906
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	97	9
Acquired Loans | Commercial real estate loans | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	3,200	3,055
With an allowance recorded	1,033	925
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	6,021	5,959
With an allowance recorded	1,050	947
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	97	9
Acquired Loans | Commercial and industrial
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	465	766
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	562	876
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	1	4
Acquired Loans | Commercial and industrial | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	437
With an allowance recorded	28	228
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	532
With an allowance recorded	30	232
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	1	4
Acquired Loans | Commercial and industrial | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance		538
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance		644
Acquired Loans | Residential
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	376	365
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	403	441
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	8	36
Acquired Loans | Residential | 1-4 family
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	292
With an allowance recorded	84	94
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	293
With an allowance recorded	110	117
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	8	36
Acquired Loans | Residential | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance		271
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance		324
Acquired Loans | Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Total	576	647
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Total	1,004	1,300
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	12	48
Acquired Loans | Consumer | Commercial real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	0	0
With an allowance recorded	39	43
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	0	11
With an allowance recorded	37	40
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	6	7
Acquired Loans | Consumer | Home equity
Impaired Financing Receivable, Recorded Investment [Abstract]
With no related allowance	416	399
With an allowance recorded	121	205
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
With no related allowance	844	1,053
With an allowance recorded	123	196
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Related Allowance	$ 6	$ 41

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