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Note 21 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Company [Member] |  |  |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,459,351 | $ 1,383,377
Common equity Tier 1 capital ( to risk-weighted assets) |  | 12.84% | 12.95%
Common equity Tier 1 capital minimum requirement |  | $ 511,590 | $ 480,830
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 947,761 | $ 902,547
Excess Common equtiy Tier 1 capital |  | 8.34% | 8.45%
Tier 1 capital (to risk-weighted assets) |  | $ 1,574,806 | $ 1,498,810
Tier 1 capital (to risk-weighted assets) |  | 13.85% | 14.03%
Tier 1 capital minimum requirement |  | $ 682,120 | $ 641,107
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 892,686 | $ 857,703
Excess Tier 1 capital |  | 7.85% | 8.03%
Total capital (to risk-weighted assets) |  | $ 1,702,144 | $ 1,634,631
Total capital (to risk-weighted assets) |  | 14.97% | 15.30%
Total capital minimum requirement |  | $ 909,493 | $ 854,809
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 792,651 | $ 779,822
Excess Total capital |  | 6.97% | 7.30%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,574,806 | $ 1,498,810
Tier 1 capital (to average assets) – Leverage ratio |  | 11.57% | 11.95%
Minimum leverage requirement |  | $ 544,614 | $ 501,875
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 1,030,192 | $ 996,935
Excess Tier One Leverage Capital |  | 7.57% | 7.95%
Risk-weighted assets |  | $ 11,368,663 | $ 10,685,115
Total average assets (1) | [1] | 13,615,348 | 12,546,879
Bank [Member] |  |  |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,515,096 | $ 1,443,159
Common equity Tier 1 capital ( to risk-weighted assets) |  | 13.35% | 13.54%
Common equity Tier 1 capital minimum requirement |  | $ 510,582 | $ 479,801
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 1,004,514 | $ 963,358
Excess Common equtiy Tier 1 capital |  | 8.85% | 9.04%
Tier 1 capital (to risk-weighted assets) |  | $ 1,515,096 | $ 1,443,159
Tier 1 capital (to risk-weighted assets) |  | 13.35% | 13.54%
Tier 1 capital minimum requirement |  | $ 680,776 | $ 639,735
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 834,320 | $ 803,424
Excess Tier 1 capital |  | 7.35% | 7.54%
Total capital (to risk-weighted assets) |  | $ 1,637,286 | $ 1,576,525
Total capital (to risk-weighted assets) |  | 14.43% | 14.79%
Total capital minimum requirement |  | $ 907,701 | $ 852,980
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 729,585 | $ 723,545
Excess Total capital |  | 6.43% | 6.79%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,515,096 | $ 1,443,159
Tier 1 capital (to average assets) – Leverage ratio |  | 11.16% | 11.53%
Minimum leverage requirement |  | $ 543,059 | $ 500,455
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 972,037 | $ 942,704
Excess Tier One Leverage Capital |  | 7.16% | 7.53%
Risk-weighted assets |  | $ 11,346,260 | $ 10,662,248
Total average assets (1) | [1] | $ 13,576,477 | $ 12,511,382
[1] | The quarterly total average assets reflect all debt securities at amortized cost, equity security with readily determinable fair values at the lower of cost or fair value, and equity securities without readily determinable fair values at historical cost.

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- Definition The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount by which the company's Total Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount by which the company's Tier 1 Leverage Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of excess Tier 1 Leverage Capital divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount by which the company's Tier 1 Risk Based Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of excess Tier 1 Risk Based Capital (which consists of the types of financial capital considered the most reliable and liquid, primarily Shareholders' equity. Examples of Tier 1 capital are common stock or unit, preferred stock or unit that is irredeemable and noncumulative, and retained earnings) divided by risk-weighted assets which are assets that are weighted for credit risk according to a formula used by the Reserve Bank. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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