LOANS - TDRs by portfolio - restructured and subsequently defaulted (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Troubled debt restructurings:
Number of loans | loan	37	36	6
Pre-modification outstanding balance	$ 3,897	$ 2,832	$ 1,213
Post-modification outstanding balance	$ 3,140	$ 2,799	$ 1,130
Commercial | Commercial Portfolio
Troubled debt restructurings:
Number of loans | loan	1	2	1
Pre-modification outstanding balance	$ 249	$ 423	$ 362
Post-modification outstanding balance	$ 249	$ 408	$ 299
Commercial real estate | Commercial Portfolio
Troubled debt restructurings:
Number of loans | loan	3	2	1
Pre-modification outstanding balance	$ 1,924	$ 1,571	$ 323
Post-modification outstanding balance	$ 1,322	$ 1,565	$ 323
Construction and land development | Commercial Portfolio
Troubled debt restructurings:
Number of loans | loan	2
Pre-modification outstanding balance	$ 221
Post-modification outstanding balance	$ 167
Residential real estate | Other loan portfolio
Troubled debt restructurings:
Number of loans | loan	25	7	4
Pre-modification outstanding balance	$ 1,422	$ 708	$ 528
Post-modification outstanding balance	$ 1,322	$ 696	$ 508
Consumer loans held for sale | Other loan portfolio
Troubled debt restructurings:
Number of loans | loan	5	25
Pre-modification outstanding balance	$ 26	$ 130
Post-modification outstanding balance	$ 25	$ 130
Lease financing | Other loan portfolio
Troubled debt restructurings:
Number of loans | loan	1
Pre-modification outstanding balance	$ 55
Post-modification outstanding balance	$ 55