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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 8,583	$ 9,952
Loans Past Due 90 Days or More and Still Accruing	3	2
Total ending loans balance	1,562,822	1,541,498
Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	4,136	10,480
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	2,587	4,598
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	304	4,357
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,245	1,525
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,558,686	1,531,018
Commercial and agricultural:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	341,994	370,252
Commercial and agricultural: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non-accrual	2,173	2,167
Loans Past Due 90 Days or More and Still Accruing	3	2
Total ending loans balance	341,572	369,968
Commercial and agricultural: | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	854	564
Commercial and agricultural: | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	829	520
Commercial and agricultural: | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	14
Commercial and agricultural: | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	25	30
Commercial and agricultural: | Commercial and industrial | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	340,718	369,404
Commercial and agricultural: | Agricultural
Financing Receivable, Past Due [Line Items]
Total ending loans balance	422	284
Commercial and agricultural: | Agricultural | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial and agricultural: | Agricultural | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial and agricultural: | Agricultural | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial and agricultural: | Agricultural | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial and agricultural: | Agricultural | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	422	284
Commercial mortgages:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	767,200	719,145
Commercial mortgages: | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual	44	55
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	67,968	62,164
Commercial mortgages: | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial mortgages: | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial mortgages: | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial mortgages: | Construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	0
Commercial mortgages: | Construction | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	67,968	62,164
Commercial mortgages: | Commercial mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	4,348	4,415
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	699,232	656,981
Commercial mortgages: | Commercial mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,061	5,442
Commercial mortgages: | Commercial mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	562	1,438
Commercial mortgages: | Commercial mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	174	3,696
Commercial mortgages: | Commercial mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	325	308
Commercial mortgages: | Commercial mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	698,171	651,539
Residential mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	916	1,632
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	247,309	240,013
Residential mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	751	1,684
Residential mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	326	817
Residential mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	28	406
Residential mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	397	461
Residential mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	246,558	238,329
Consumer loans:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	206,319	212,088
Consumer loans: | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Non-accrual	770	1,159
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	74,309	78,761
Consumer loans: | Home equity lines and loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	662	1,036
Consumer loans: | Home equity lines and loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	273	521
Consumer loans: | Home equity lines and loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	41
Consumer loans: | Home equity lines and loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	389	474
Consumer loans: | Home equity lines and loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	73,647	77,725
Consumer loans: | Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	318	519
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	120,895	120,853
Consumer loans: | Indirect consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	777	1,718
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	569	1,268
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	102	198
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	106	252
Consumer loans: | Indirect consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	120,118	119,135
Consumer loans: | Direct consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	14	5
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	11,115	12,474
Consumer loans: | Direct consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	31	36
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	28	34
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	0	2
Consumer loans: | Direct consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	3	0
Consumer loans: | Direct consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 11,084	$ 12,438

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