Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	$ 596,819		$ 560,688
Available-for-Sale Securities	577,820	$ 564,839	$ 564,839
Available-for-Sale Securities, Gross Unrealized Gain	1,689	9,178
Available-for-Sale Securities, Gross Unrealized Loss	20,688	5,027
US Treasury Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	60,406	15,736
Available-for-Sale Securities	58,595	15,436
Available-for-Sale Securities, Gross Unrealized Gain
Available-for-Sale Securities, Gross Unrealized Loss	1,811	300
US Government-sponsored Enterprises Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	2,499	2,499
Available-for-Sale Securities	2,317	2,501
Available-for-Sale Securities, Gross Unrealized Gain		2
Available-for-Sale Securities, Gross Unrealized Loss	182	0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	391,271	398,125
Available-for-Sale Securities	378,348	397,729
Available-for-Sale Securities, Gross Unrealized Gain	217	3,596
Available-for-Sale Securities, Gross Unrealized Loss	13,140	3,992
Small Business Administration pools [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	28,112	30,835
Available-for-Sale Securities	27,984	31,273
Available-for-Sale Securities, Gross Unrealized Gain	209	505
Available-for-Sale Securities, Gross Unrealized Loss	337	67
US States and Political Subdivisions Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	105,757	105,469
Available-for-Sale Securities	101,971	109,848
Available-for-Sale Securities, Gross Unrealized Gain	1,182	4,918
Available-for-Sale Securities, Gross Unrealized Loss	4,968	539
Corporate and other securities [Member]
Marketable Securities [Line Items]
Available-for-Sale Securities, Amortized Cost Basis	8,774	8,024
Available-for-Sale Securities	8,605	8,052
Available-for-Sale Securities, Gross Unrealized Gain	81	157
Available-for-Sale Securities, Gross Unrealized Loss	$ 250	$ 129

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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- Definition

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.

+ References

No definition available.

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