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Note 21 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,572,025 | $ 1,459,351
Common equity Tier 1 capital ( to risk-weighted assets) |  | 12.19% | 12.84%
Common equity Tier 1 capital minimum requirement |  | $ 580,552 | $ 511,590
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 991,473 | $ 947,761
Excess Common equtiy Tier 1 capital |  | 7.69% | 8.34%
Tier 1 capital (to risk-weighted assets) |  | $ 1,572,025 | $ 1,574,806
Tier 1 capital (to risk-weighted assets) |  | 12.19% | 13.85%
Tier 1 capital minimum requirement |  | $ 774,070 | $ 682,120
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 797,955 | $ 892,686
Excess Tier 1 capital |  | 6.19% | 7.85%
Total capital (to risk-weighted assets) |  | $ 1,820,860 | $ 1,702,144
Total capital (to risk-weighted assets) |  | 14.11% | 14.97%
Total capital minimum requirement |  | $ 1,032,093 | $ 909,493
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 788,767 | $ 792,651
Excess Total capital |  | 6.11% | 6.97%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,572,025 | $ 1,574,806
Tier 1 capital (to average assets) – Leverage ratio |  | 10.35% | 11.57%
Minimum leverage requirement |  | $ 607,349 | $ 544,614
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 964,676 | $ 1,030,192
Excess Tier One Leverage Capital |  | 6.35% | 7.57%
Risk-weighted assets |  | $ 12,901,161 | $ 11,368,663
Total average assets (1) | [1] | 15,183,720 | 13,615,348
Bank [Member] |  |  |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,734,719 | $ 1,515,096
Common equity Tier 1 capital ( to risk-weighted assets) |  | 13.46% | 13.35%
Common equity Tier 1 capital minimum requirement |  | $ 579,921 | $ 510,582
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 1,154,798 | $ 1,004,514
Excess Common equtiy Tier 1 capital |  | 8.96% | 8.85%
Tier 1 capital (to risk-weighted assets) |  | $ 1,734,719 | $ 1,515,096
Tier 1 capital (to risk-weighted assets) |  | 13.46% | 13.35%
Tier 1 capital minimum requirement |  | $ 773,229 | $ 680,776
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 961,490 | $ 834,320
Excess Tier 1 capital |  | 7.46% | 7.35%
Total capital (to risk-weighted assets) |  | $ 1,862,806 | $ 1,637,286
Total capital (to risk-weighted assets) |  | 14.45% | 14.43%
Total capital minimum requirement |  | $ 1,030,971 | $ 907,701
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 831,835 | $ 729,585
Excess Total capital |  | 6.45% | 6.43%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,734,719 | $ 1,515,096
Tier 1 capital (to average assets) – Leverage ratio |  | 11.82% | 11.16%
Minimum leverage requirement |  | $ 586,959 | $ 543,059
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 1,147,760 | $ 972,037
Excess Tier One Leverage Capital |  | 7.82% | 7.16%
Risk-weighted assets |  | $ 12,887,142 | $ 11,346,260
Total average assets (1) | [1] | $ 14,673,981 | $ 13,576,477
[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 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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&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=84167132&loc=d3e65071-112826 + Details
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