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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Securities available-for-sale |  | $ 1,219,541 |  | $ 1,127,309 |  |
Equity securities |  | 27,740 |  | 22,319 |  |
Warrants |  | 38,377 |  | 10,090 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Securities available-for-sale |  | 119,748 |  | 0 |  |
Equity securities |  | 27,740 |  | 22,319 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Securities available-for-sale |  | 1,099,793 |  | 1,127,309 |  |
Equity securities |  | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Securities available-for-sale |  | 0 |  | 0 |  |
Equity securities |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |
Cash and due from banks |  | 138,979 |  | 134,141 |  | $ 134,141
Short-term investments |  | 1,119,105 |  | 2,315,563 |  |
Securities available-for-sale |  | 1,219,541 |  | 1,127,309 |  | 1,127,309
Loans, net |  | 17,184,664 | [1] | 16,499,869 | [1] | 16,499,869
Equity securities |  | 27,740 |  | 22,319 |  | 22,319
Investment in Federal Home Loan Bank stock |  | 17,250 |  | 17,250 |  | 17,250
Deposits |  | 18,039,184 |  | 18,051,720 |  |
Advances from Federal Home Loan Bank |  | 20,444 |  | 21,279 |  |
Other borrowings |  | 18,803 |  | 18,945 |  |
Long-term debt |  | 55,126 |  | 62,274 |  |
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |  |  |  |
Warrants |  | 24 |  | 23 |  | $ 23
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Cash and due from banks |  | 138,979 |  | 134,141 |  |
Short-term investments |  | 1,119,105 |  | 2,315,563 |  |
Securities available-for-sale |  | 119,748 |  | 0 |  |
Loans, net | [1] | 0 |  | 0 |  |
Equity securities |  | 27,740 |  | 22,319 |  |
Investment in Federal Home Loan Bank stock |  | 0 |  | 0 |  |
Deposits |  | 0 |  | 0 |  |
Advances from Federal Home Loan Bank |  | 0 |  | 0 |  |
Other borrowings |  | 0 |  | 0 |  |
Long-term debt |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Warrants [Member] |  |  |  |  |  |
Warrants |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Cash and due from banks |  | 0 |  | 0 |  |
Short-term investments |  | 0 |  | 0 |  |
Securities available-for-sale |  | 1,099,793 |  | 1,127,309 |  |
Loans, net | [1] | 0 |  | 0 |  |
Equity securities |  | 0 |  | 0 |  |
Investment in Federal Home Loan Bank stock |  | 17,250 |  | 17,250 |  |
Deposits |  | 0 |  | 0 |  |
Advances from Federal Home Loan Bank |  | 20,444 |  | 21,279 |  |
Other borrowings |  | 0 |  | 0 |  |
Long-term debt |  | 55,126 |  | 62,274 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Warrants [Member] |  |  |  |  |  |
Warrants |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Cash and due from banks |  | 0 |  | 0 |  |
Short-term investments |  | 0 |  | 0 |  |
Securities available-for-sale |  | 0 |  | 0 |  |
Loans, net | [1] | 17,184,664 |  | 16,499,869 |  |
Equity securities |  | 0 |  | 0 |  |
Investment in Federal Home Loan Bank stock |  | 0 |  | 0 |  |
Deposits |  | 18,039,184 |  | 18,051,720 |  |
Advances from Federal Home Loan Bank |  | 0 |  | 0 |  |
Other borrowings |  | 18,803 |  | 18,945 |  |
Long-term debt |  | 0 |  | 0 |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |  |  |  |
Warrants |  | $ 24 |  | $ 23 |  |
[1] | In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit price notion.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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