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LOANS AND ALLOWANCE FOR LOAN LOSSES - Receivables Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 8,373	$ 9,952
Loans Past Due 90 Days or More and Still Accruing	4	2
Total ending loans balance	1,520,929	1,541,498
Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	11,065	10,480
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	5,284	4,598
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	4,372	4,357
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,409	1,525
Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,509,864	1,531,018
Commercial and agricultural:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	271,872	370,252
Commercial and agricultural: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non-accrual	2,080	2,167
Loans Past Due 90 Days or More and Still Accruing	4	2
Total ending loans balance	271,451	369,968
Commercial and agricultural: | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	2,530	564
Commercial and agricultural: | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,110	520
Commercial and agricultural: | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,375	14
Commercial and agricultural: | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	45	30
Commercial and agricultural: | Commercial and industrial | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	268,921	369,404
Commercial and agricultural: | Agricultural
Financing Receivable, Past Due [Line Items]
Total ending loans balance	421	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	421	284
Commercial mortgages:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	791,476	719,145
Commercial mortgages: | Construction
Financing Receivable, Past Due [Line Items]
Non-accrual	36	55
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	67,644	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	67,644	62,164
Commercial mortgages: | Commercial mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	4,212	4,415
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	723,832	656,981
Commercial mortgages: | Commercial mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	4,888	5,442
Commercial mortgages: | Commercial mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	2,056	1,438
Commercial mortgages: | Commercial mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	2,615	3,696
Commercial mortgages: | Commercial mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	217	308
Commercial mortgages: | Commercial mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	718,944	651,539
Residential mortgages
Financing Receivable, Past Due [Line Items]
Non-accrual	845	1,632
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	254,641	240,013
Residential mortgages | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,793	1,684
Residential mortgages | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,226	817
Residential mortgages | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	131	406
Residential mortgages | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	436	461
Residential mortgages | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	252,848	238,329
Consumer loans:
Financing Receivable, Past Due [Line Items]
Total ending loans balance	202,940	212,088
Consumer loans: | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Non-accrual	819	1,159
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	72,653	78,761
Consumer loans: | Home equity lines and loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	818	1,036
Consumer loans: | Home equity lines and loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	115	521
Consumer loans: | Home equity lines and loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	161	41
Consumer loans: | Home equity lines and loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	542	474
Consumer loans: | Home equity lines and loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	71,835	77,725
Consumer loans: | Indirect consumer loans
Financing Receivable, Past Due [Line Items]
Non-accrual	367	519
Loans Past Due 90 Days or More and Still Accruing	0	0
Total ending loans balance	120,045	120,853
Consumer loans: | Indirect consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	1,008	1,718
Consumer loans: | Indirect consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	764	1,268
Consumer loans: | Indirect consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	83	198
Consumer loans: | Indirect consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	161	252
Consumer loans: | Indirect consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	119,037	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	10,242	12,474
Consumer loans: | Direct consumer loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	28	36
Consumer loans: | Direct consumer loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	13	34
Consumer loans: | Direct consumer loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	7	2
Consumer loans: | Direct consumer loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	8	0
Consumer loans: | Direct consumer loans | Loans Not Past Due
Financing Receivable, Past Due [Line Items]
Non-accrual	$ 10,214	$ 12,438

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