BORROWINGS (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
BORROWINGS
Borrowings from FHLB	$ 15,000,000	$ 15,000,000
Number of unsecured federal funds lines of credit	3	3
Total loans held for investment	$ 1,546,784,000	$ 1,534,185,000
Federal Funds Lines of Credit One
BORROWINGS
Maximum borrowing capacity	10,000,000.0	10,000,000.0
Amount outstanding	0	0
Federal Funds Lines of Credit Two
BORROWINGS
Maximum borrowing capacity	19,000,000.0	19,000,000.0
Federal Funds Line of Credit Three
BORROWINGS
Maximum borrowing capacity	25,000,000.0	25,000,000.0
Credit Note [Member]
BORROWINGS
Amount outstanding	0	0
Face amount	$ 5,000,000.0	5,000,000.0
interest rate (as a percent)	2.50%
PPP Loans
BORROWINGS
Total loans held for investment	$ 183,000,000.0
PPPLF
BORROWINGS
Interest bearing rate	0.35%
PPPLF \| Minimum
BORROWINGS
Debt term	2 years
PPPLF \| Maximum
BORROWINGS
Debt term	5 years
FHLB Topeka
BORROWINGS
Amount of collateral pledged	$ 692,400,000	668,600,000
Available balance	$ 459,100,000
April 22, 2022
BORROWINGS
Interest rate	0.37%
Borrowings from FHLB	$ 5,000,000	5,000,000
May 5, 2023
BORROWINGS
Interest rate	0.76%
Borrowings from FHLB	$ 10,000,000	$ 10,000,000

Represents the number of unsecured federal funds lines of credit.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

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