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Note 16 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Cash and due from banks | $ 218,017,000 | $ 180,130,000 |  | $ 176,830,000 | $ 153,747,000
Cash and due from banks, fair value | 218,017,000 | 180,130,000 |  |  |
Short-term investments | 967,067,000 | 536,880,000 |  |  |
Securities available-for-sale | 1,314,345,000 | 1,586,352,000 | [1] |  |
Loans held for sale | 7,500,000 | 6,676,000 |  |  |
Loans held for sale, fair value | 7,500,000 | 6,676,000 |  |  |
Loans, net | 11,077,315,000 | 10,016,227,000 |  |  |
Loans, net, fair value | 11,006,344,000 | 9,938,810,000 |  |  |
Investment in Federal Home Loan Bank stock | 17,250,000 | 17,250,000 |  |  |
Investment in Federal Home Loan Bank stock, fair value | 17,250,000 | 17,250,000 |  |  |
Warrants | 79,000 | 62,000 |  |  |
Warrants, fair value | 79,000 | 62,000 |  |  |
Foreign exchange contracts with gain | 82,439,000 | 100,602,000 |  |  |
Foreign exchange contracts with gain, fair value | 1,302,000 | 3,339,000 |  |  |
Interest rate swaps | 361,526,000 |  |  |  |
Interest rate swaps, fair value | 938,000 |  |  |  |
Deposits | 11,674,726,000 | 10,509,087,000 |  |  |
Deposits, fair value | 11,680,017,000 | 10,509,879,000 |  |  |
Securities sold under agreements to repurchase | 350,000,000 | 400,000,000 |  |  |
Securities sold under agreements to repurchase, fair value | 351,989,000 | 413,417,000 |  |  |
Advances from Federal Home Loan Bank | 350,000,000 | 275,000,000 |  |  |
Advances from Federal Home Loan Bank, fair value | 350,062,000 | 274,488,000 |  |  |
Other borrowings | 17,662,000 | 18,593,000 |  |  |
Other borrowings, fair value | 15,944,000 | 16,684,000 |  |  |
Long-term debt | 119,136,000 | 119,136,000 |  |  |
Long-term debt, fair value | 63,169,000 | 58,420,000 |  |  |
Option contracts | 12,117,000 | 9,396,000 |  |  |
Option contracts, fair value | 121,000 | 28,000 |  |  |
Foreign exchange contracts with loss | 89,545,000 | 115,418,000 |  |  |
Foreign exchange contracts with loss, fair value | 3,132,000 | 4,124,000 |  |  |
Interest rate swaps | 119,136,000 | 459,416,000 |  |  |
Interest rate swaps, fair value | 3,744,000 | 6,496,000 |  |  |
Commitments to extend credit | 2,062,241,000 | 1,971,848,000 |  |  |
Commitments to extend credit, fair value | (6,025,000) | (5,570,000) |  |  |
Standby letters of credit | 75,396,000 | 49,081,000 |  |  |
Standby letters of credit, fair value | (668,000) | (194,000) |  |  |
Other letters of credit | 37,283,000 | 38,131,000 |  |  |
Other letters of credit, fair value | (16,000) | (22,000) |  |  |
Bill of lading guarantees | 75,000 | 454,000 |  |  |
Bill of lading guarantees, fair value | $ 0 | $ (1,000) |  |  |
[1] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_ShortTermInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant