BORROWING ARRANGEMENTS, Notes Payable and Other Borrowings (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank Advance [Member] \| Federal Home Loan Bank of Dallas [Member] \| City Bank [Member]
Detail of Advances from FHLB [Abstract]
Original amount of advances	$ 0	$ 0

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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