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Note 13 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Cash and due from banks | $ 167,886 | $ 218,017
Securities available-for-sale | 1,368,487 | 1,314,345
Loans held for sale |  | 7,500
Loans, net | 12,403,100 | 11,006,344
Investment in Federal Home Loan Bank stock | 21,948 | 17,250
Investment in Federal Reserve Bank stock | 8,733 |
Warrants | 2,314 | 938
Foreign exchange contracts with gain | 69,278 | 82,439
Foreign exchange contracts with gain, fair value | 1,725 | 1,302
Interest rate swaps | 155,671 | 361,526
Interest rate swaps, fair value | 2,314 | 938
Deposits | 12,573,127 | 11,680,017
Securities sold under agreements to repurchase | 100,549 | 351,989
Advances from Federal Home Loan Bank | 595,037 | 350,062
Other borrowings | 151,643 | 15,944
Long-term debt | 68,056 | 63,169
Option contracts | 12,307 | 12,117
Option contracts, fair value | 234 | 121
Foreign exchange contracts with loss | 86,625 | 89,545
Foreign exchange contracts with loss, fair value | 1,083 | 3,132
Interest rate swaps | 510,841 | 119,136
Interest rate swaps, fair value | 5,049 | 3,744
Commitments to extend credit | 2,287,498 | 2,062,241
Commitments to extend credit, fair value | (6,924) | (6,025)
Standby letters of credit | 140,682 | 75,396
Standby letters of credit, fair value | (1,699) | (668)
Other letters of credit | 41,868 | 37,283
Other letters of credit, fair value | (218) | (16)
Bill of lading guarantees | 24 | 75
Bill of lading guarantees, fair value |  |
Warrants [Member] |  |
Warrants | 97 |
Reported Value Measurement [Member] |  |
Cash and due from banks | 167,886 | 218,017
Short-term investments | 573,059 | 967,067
Securities available-for-sale | 1,368,487 | 1,314,345
Loans held for sale |  | 7,500
Loans, net | 12,472,475 | 11,077,315
Investment in Federal Home Loan Bank stock | 21,948 | 17,250
Investment in Federal Reserve Bank stock | 8,733 |
Deposits | 12,561,695 | 11,674,726
Securities sold under agreements to repurchase | 100,000 | 350,000
Advances from Federal Home Loan Bank | 595,000 | 350,000
Other borrowings | 153,574 | 17,662
Long-term debt | 119,136 | 119,136
Reported Value Measurement [Member] | Warrants [Member] |  |
Warrants | 97 | 79
Estimate of Fair Value Measurement [Member] |  |
Cash and due from banks | 167,886 | 218,017
Short-term investments | 573,059 | 967,067
Securities available-for-sale | 1,368,487 | 1,314,345
Loans held for sale |  | 7,500
Loans, net | 12,403,100 | 11,006,344
Investment in Federal Home Loan Bank stock | 21,948 | 17,250
Investment in Federal Reserve Bank stock | 8,733 |
Deposits | 12,573,127 | 11,680,017
Securities sold under agreements to repurchase | 100,549 | 351,989
Advances from Federal Home Loan Bank | 595,037 | 350,062
Other borrowings | 151,643 | 15,944
Long-term debt | 68,056 | 63,169
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |
Warrants | $ 97 | $ 79

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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, 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592 + 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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