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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Equity securities |  | $ 20,993 | $ 23,744
Warrants |  | 3,615 | 3,409
Foreign exchange contracts with gain |  | 154,340 | 151,244
Foreign exchange contracts with gain, fair value |  | 2,891 | 4,658
Interest rate swaps |  | 496,140 | 96,889
Interest rate swaps, fair value |  | 3,615 | 3,409
Foreign exchange contracts with loss |  | 96,119 | 132,813
Foreign exchange contracts with loss, fair value |  | 2,550 | 2,200
Interest rate swaps |  | 662,228 | 679,648
Interest rate swaps, fair value |  | 12,116 | 10,286
Commitments to extend credit |  | 3,095,013 | 2,977,528
Commitments to extend credit, fair value |  | (9,614) | (8,432)
Standby letters of credit |  | 237,488 | 234,200
Standby letters of credit, fair value |  | (1,720) | (1,630)
Other letters of credit |  | 21,975 | 16,821
Other letters of credit, fair value |  | (19) | (16)
Bill of lading guarantees |  | 0 | 238
Bill of lading guarantees, fair value |  | 0 | 0
Reported Value Measurement [Member] |  |  |
Cash and due from banks |  | 141,885 | 138,616
Short-term investments |  | 1,612,411 | 1,282,462
Securities available-for-sale |  | 908,844 | 1,036,550
Loans, net |  | 15,497,712 | 15,475,364
Equity securities |  | 20,993 | 23,744
Investment in Federal Home Loan Bank stock |  | 17,250 | 17,250
Deposits |  | 16,353,633 | 16,109,401
Advances from Federal Home Loan Bank |  | 75,000 | 150,000
Other borrowings |  | 23,333 | 23,714
Long-term debt |  | 119,136 | 119,136
Reported Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | 16 | 21
Estimate of Fair Value Measurement [Member] |  |  |
Cash and due from banks |  | 141,885 | 138,616
Short-term investments |  | 1,612,411 | 1,282,462
Securities available-for-sale |  | 908,844 | 1,036,550
Loans, net | [1] | 16,094,374 | 16,103,471
Equity securities |  | 20,993 | 23,744
Investment in Federal Home Loan Bank stock |  | 17,250 | 17,250
Deposits |  | 16,364,101 | 16,125,808
Advances from Federal Home Loan Bank |  | 77,691 | 155,133
Other borrowings |  | 19,861 | 19,632
Long-term debt |  | 64,892 | 65,487
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants |  | $ 16 | $ 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 Commitments to Extend Credit, Fair Value + References No definition available. + Details
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- Definition Other Letters of Credit, Fair Value + References No definition available. + Details
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- Definition Fair value portion of short-term investments. + References No definition available. + Details
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- Definition Standby Letters of Credit, Fair Value + References No definition available. + Details
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- Definition Standby Letters Of Credit Notional Amount + References No definition available. + 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 deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + 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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