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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available-for-sale |  | $ 1,127,309 | $ 1,036,550
Equity securities |  | 22,319 | 23,744
Warrants |  | 10,090 | 3,409
Fair Value, Inputs, Level 1 [Member] |  |  |
Securities available-for-sale |  | 0 | 80,948
Equity securities |  | 22,319 | 23,744
Fair Value, Inputs, Level 2 [Member] |  |  |
Securities available-for-sale |  | 1,127,309 | 955,602
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 |  | 134,141 | 138,616
Short-term investments |  | 2,315,563 | 1,282,462
Securities available-for-sale |  | 1,127,309 | 1,036,550
Loans, net | [1] | 16,499,869 | 16,103,471
Equity securities |  | 22,319 | 23,744
Investment in Federal Home Loan Bank stock |  | 17,250 | 17,250
Deposits |  | 18,051,720 | 16,125,808
Advances from Federal Home Loan Bank |  | 21,279 | 155,133
Other borrowings |  | 18,945 | 19,632
Long-term debt |  | 62,274 | 65,487
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | 23 | 21
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and due from banks |  | 134,141 | 138,616
Short-term investments |  | 2,315,563 | 1,282,462
Securities available-for-sale |  | 0 | 80,948
Loans, net | [1] | 0 | 0
Equity securities |  | 22,319 | 23,744
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 |  | 1,127,309 | 955,602
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 |  | 21,279 | 155,133
Other borrowings |  | 0 | 0
Long-term debt |  | 62,274 | 65,487
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] | 16,499,869 | 16,103,471
Equity securities |  | 0 | 0
Investment in Federal Home Loan Bank stock |  | 0 | 0
Deposits |  | 18,051,720 | 16,125,808
Advances from Federal Home Loan Bank |  | 0 | 0
Other borrowings |  | 18,945 | 19,632
Long-term debt |  | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |
Warrants |  | $ 23 | $ 21
[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 http://asc.fasb.org/extlink&oid=120398452&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 http://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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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