SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held for Sale and Loans (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Fair value option, aggregate fair value exceeded principal amount	$ 226
Maturity of interest bearing deposits	90 days
Evaluation period to return non accrual TDRs to accrual status	6 months

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Name:	us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant