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LOANS - Recorded Investment and Number of Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) modification	Dec. 31, 2018 USD ($) modification	Dec. 31, 2017 USD ($) modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	31	41	18
Pre-Modification Outstanding Recorded Investment	$ 2,923	$ 6,081	$ 1,713
Post-Modification Outstanding Recorded Investment	2,630	4,914	1,504
Individually evaluated for impairment	$ 69	$ 354	$ 0
Commercial real estate: | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	0	1
Individually evaluated for impairment	$ 0	$ 1
Commercial real estate: | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	10	9	6
Pre-Modification Outstanding Recorded Investment	$ 630	$ 1,896	$ 388
Post-Modification Outstanding Recorded Investment	529	1,564	222
Individually evaluated for impairment	$ 69	$ 153	$ 0
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	7	7	6
Pre-Modification Outstanding Recorded Investment	$ 366	$ 556	$ 563
Post-Modification Outstanding Recorded Investment	271	486	545
Individually evaluated for impairment	$ 0	$ 55	$ 0
Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	2	1	1
Pre-Modification Outstanding Recorded Investment	$ 500	$ 167	$ 19
Post-Modification Outstanding Recorded Investment	503	0	18
Individually evaluated for impairment	$ 0	$ 0	$ 0
Commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Individually evaluated for impairment	$ 0
Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	12	19	3
Pre-Modification Outstanding Recorded Investment	$ 1,427	$ 3,348	$ 692
Post-Modification Outstanding Recorded Investment	1,327	2,752	670
Individually evaluated for impairment	$ 0	$ 145	$ 0
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	1	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 100	$ 13
Post-Modification Outstanding Recorded Investment	0	100	13
Individually evaluated for impairment	$ 0	$ 0	$ 0
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	3	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 13	$ 38
Post-Modification Outstanding Recorded Investment	0	11	36
Individually evaluated for impairment	$ 0	$ 0	$ 0
Interest rate and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	2	1	6
Post-Modification Outstanding Recorded Investment	$ 73	$ 16	$ 725
Amortization and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	4	1	6
Post-Modification Outstanding Recorded Investment	$ 273	$ 286	$ 490
Amortization concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	1
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 94
Amortization, interest rate and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	5	0	1
Post-Modification Outstanding Recorded Investment	$ 539	$ 0	$ 36
Amortization and interest rate concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Forbearance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	5	3	0
Post-Modification Outstanding Recorded Investment	$ 346	$ 271	$ 0
Forbearance and interest only payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	7	6	0
Post-Modification Outstanding Recorded Investment	$ 692	$ 121	$ 0
Forbearance and interest rate concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	1	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 49	$ 0
Forbearance and maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	4	20	0
Post-Modification Outstanding Recorded Investment	$ 472	$ 2,030	$ 0
Maturity concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	2	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 440	$ 0
Restructure without concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	5	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 1,419	$ 0
Court ordered
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	4	2	4
Post-Modification Outstanding Recorded Investment	$ 235	$ 282	$ 159

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