LOANS - TDRs by portfolio - restructured and subsequently defaulted (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Troubled debt restructurings:
Number of loans | loan	14	8	31	24
Pre-modification outstanding balance	$ 1,736	$ 520	$ 4,303	$ 3,100
Post-modification outstanding balance	$ 1,657	$ 502	$ 4,067	$ 2,928
Commercial loans | Commercial
Troubled debt restructurings:
Number of loans | loan	0	0	2	1
Pre-modification outstanding balance	$ 0	$ 0	$ 432	$ 249
Post-modification outstanding balance	$ 0	$ 0	$ 429	$ 249
Commercial loans | Commercial real estate
Troubled debt restructurings:
Number of loans | loan	2	0	4	3
Pre-modification outstanding balance	$ 164	$ 0	$ 797	$ 1,924
Post-modification outstanding balance	$ 129	$ 0	$ 735	$ 1,837
Commercial loans | Construction and land development
Troubled debt restructurings:
Number of loans | loan	1	1	3	2
Pre-modification outstanding balance	$ 526	$ 159	$ 1,010	$ 221
Post-modification outstanding balance	$ 494	$ 155	$ 966	$ 170
Residential real estate
Troubled debt restructurings:
Number of loans | loan	9	7	20	16
Pre-modification outstanding balance	$ 1,037	$ 361	$ 2,055	$ 691
Post-modification outstanding balance	$ 1,025	$ 347	$ 1,928	$ 664
Consumer
Troubled debt restructurings:
Number of loans | loan	2	0	2	2
Pre-modification outstanding balance	$ 9	$ 0	$ 9	$ 15
Post-modification outstanding balance	$ 9	$ 0	$ 9	$ 8
Lease financing
Troubled debt restructurings:
Number of loans | loan	0	0	0	0
Pre-modification outstanding balance	$ 0	$ 0	$ 0	$ 0
Post-modification outstanding balance	0	$ 0	0	$ 0
COVID-19
Troubled debt restructurings that subsequently defaulted
Modifications not considered TDRs	$ 279,300		$ 279,300