LOANS - Composition of Loans (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022 USD ($) segment loan	Dec. 31, 2021 USD ($) loan segment	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 1,314,066	$ 1,254,117	$ 1,087,461	$ 1,033,733
% of Total	100.00%	100.00%		100.00%
Deferred loan fees	$ (3,996)	$ (3,817)		$ (3,618)
Allowance for loan losses	(15,492)	(14,844)	(12,605)	(11,859)	$ (9,265)
Loans, net	$ 1,294,578	$ 1,235,456		1,018,256
Number of loan portfolio segments \| segment	3	3
Loans, net of unearned income	$ 1,310,070	$ 1,250,300		1,030,115
Real estate mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,085,228	1,038,511	848,104	769,694
Allowance for loan losses	(10,206)	(11,554)	(9,274)	(8,057)	(7,254)
Real estate mortgages \| Construction and development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 165,400	$ 174,480		$ 102,559
% of Total	12.60%	13.90%		9.90%
Real estate mortgages \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 154,143	$ 147,490		$ 152,212
% of Total	11.70%	11.80%		14.70%
Real estate mortgages \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 765,685	$ 716,541		$ 514,923
% of Total	58.30%	57.10%		49.80%
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 219,761	$ 206,897	230,157	$ 254,395
% of Total	16.70%	16.50%		24.60%
Allowance for loan losses	$ (5,175)	$ (3,166)	(3,192)	$ (3,609)	(1,885)
Commercial and industrial \| Paycheck Protection Plan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans outstanding \| loan	6	36
Loans, net of unearned income	$ 893	$ 9,203
Deferred loan fees	0	298
Adjustment to loan yield	298	2,677
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 9,077	$ 8,709	9,200	$ 9,644
% of Total	0.70%	0.70%		1.00%
Allowance for loan losses	$ (111)	$ (124)	$ (139)	$ (193)	$ (126)

Financing Receivable, Excluding Accrued Interest, Before Allowance for Credit Loss, Percentage

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- Definition

Financing Receivable, Number Of Loan Portfolio Segments

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Financing Receivable, Number Of Loans Outstanding

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The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount excluding accrued interest, after allowance for credit loss, of financing receivable.

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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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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Amount of unamortized loan commitment, origination, and other fees (costs) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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