REGULATORY MATTERS - Text (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 risk-based capital, actual, amount	$ 873,039	$ 846,337
Junior Subordinated Debentures
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 risk-based capital, actual, amount	$ 100,000	$ 100,000

Amount of Tier 1 risk-based capital as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Name:	us-gaap_TierOneRiskBasedCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant