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Note 22 - Regulatory Matters (Details) - Capital and Leverage Ratios - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Company [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equtiy Tier 1 capital ( to risk-weighted assets) |  | $ 1,383,377 |
Common equtiy Tier 1 capital ( to risk-weighted assets) |  | 12.95% |
Common equtiy Tier 1 capital minimum requirement |  | $ 480,830 |
Common equtiy Tier 1 capital minimum requirement |  | 4.50% |
Excess |  | $ 902,547 |
Excess |  | 8.45% |
Tier 1 capital (to risk-weighted assets) |  | $ 1,498,810 | $ 1,406,511
Tier 1 capital (to risk-weighted assets) |  | 14.03% | 14.96%
Tier 1 capital minimum requirement |  | $ 641,107 | $ 376,072
Tier 1 capital minimum requirement |  | 6.00% | 4.00%
Excess |  | $ 857,703 | $ 1,030,439
Excess |  | 8.03% | 10.96%
Total capital (to risk-weighted assets) |  | $ 1,634,631 | $ 1,524,702
Total capital (to risk-weighted assets) |  | 15.30% | 16.22%
Total capital minimum requirement |  | $ 854,809 | $ 752,144
Total capital minimum requirement |  | 8.00% | 8.00%
Excess |  | $ 779,822 | $ 772,558
Excess |  | 7.30% | 8.22%
Tier 1 capital (to average assets) |  |  |
– Leverage ratio |  | $ 1,498,810 | $ 1,406,511
– Leverage ratio |  | 11.95% | 12.99%
Minimum leverage requirement |  | $ 501,875 | $ 433,121
Minimum leverage requirement |  | 4.00% | 4.00%
Excess |  | $ 996,935 | $ 973,390
Excess |  | 7.95% | 8.99%
Risk-weighted assets |  | $ 10,685,115 | $ 9,401,803
Total average assets (1) | [1] | 12,546,879 | 10,828,015
Bank [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equtiy Tier 1 capital ( to risk-weighted assets) |  | $ 1,443,159 |
Common equtiy Tier 1 capital ( to risk-weighted assets) |  | 13.54% |
Common equtiy Tier 1 capital minimum requirement |  | $ 479,801 |
Common equtiy Tier 1 capital minimum requirement |  | 4.50% |
Excess |  | $ 963,358 |
Excess |  | 9.04% |
Tier 1 capital (to risk-weighted assets) |  | $ 1,443,159 | $ 1,353,481
Tier 1 capital (to risk-weighted assets) |  | 13.54% | 14.42%
Tier 1 capital minimum requirement |  | $ 639,735 | $ 375,318
Tier 1 capital minimum requirement |  | 6.00% | 4.00%
Excess |  | $ 803,424 | $ 978,163
Excess |  | 7.54% | 10.42%
Total capital (to risk-weighted assets) |  | $ 1,576,525 | $ 1,471,337
Total capital (to risk-weighted assets) |  | 14.79% | 15.68%
Total capital minimum requirement |  | $ 852,980 | $ 750,637
Total capital minimum requirement |  | 8.00% | 8.00%
Excess |  | $ 723,545 | $ 720,700
Excess |  | 6.79% | 7.68%
Tier 1 capital (to average assets) |  |  |
– Leverage ratio |  | $ 1,443,159 | $ 1,353,481
– Leverage ratio |  | 11.53% | 12.52%
Minimum leverage requirement |  | $ 500,455 | $ 432,350
Minimum leverage requirement |  | 4.00% | 4.00%
Excess |  | $ 942,704 | $ 921,131
Excess |  | 7.53% | 8.52%
Risk-weighted assets |  | $ 10,662,248 | $ 9,382,961
Total average assets (1) | [1] | $ 12,511,382 | $ 10,808,747
[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 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 minimum amount of Tier 1 Leverage 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 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 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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