LOANS - Loan participations purchased and sold and Loans Guaranteed (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Loans
SBA loans that were sold with servicing retained	$ 508,000	$ 818,000
Commercial and industrial
Loans
Participations purchased during the period		$ 1,256,000
Commercial real estate
Loans
Participations purchased during the period	$ 2,500,000

Amount of increase from purchase of financing receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableSignificantPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration