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Note 22 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,736,854 | $ 1,572,025
Common equity Tier 1 capital ( to risk-weighted assets) |  | 12.43% | 12.19%
Common equity Tier 1 capital minimum requirement |  | $ 628,393 | $ 580,552
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 1,108,461 | $ 991,473
Excess Common equtiy Tier 1 capital |  | 7.93% | 7.69%
Tier 1 capital (to risk-weighted assets) |  | $ 1,736,854 | $ 1,572,025
Tier 1 capital (to risk-weighted assets) |  | 12.43% | 12.19%
Tier 1 capital minimum requirement |  | $ 838,258 | $ 774,070
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 898,596 | $ 797,955
Excess Tier 1 capital |  | 6.43% | 6.19%
Total capital (to risk-weighted assets) |  | $ 1,976,995 | $ 1,820,860
Total capital (to risk-weighted assets) |  | 14.15% | 14.11%
Total capital minimum requirement |  | $ 1,117,677 | $ 1,032,093
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 859,318 | $ 788,767
Excess Total capital |  | 6.15% | 6.11%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,736,854 | $ 1,572,025
Tier 1 capital (to average assets) – Leverage ratio |  | 10.83% | 10.35%
Minimum leverage requirement |  | $ 641,755 | $ 607,349
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 1,095,099 | $ 964,676
Excess Tier One Leverage Capital |  | 6.83% | 6.35%
Risk-weighted assets |  | $ 13,969,004 | $ 12,901,161
Total average assets (1) | [1] | 16,042,924 | 15,183,720
Bank [Member] |  |  |
Common equity Tier 1 capital ( to risk-weighted assets) |  | $ 1,904,820 | $ 1,734,719
Common equity Tier 1 capital ( to risk-weighted assets) |  | 13.66% | 13.46%
Common equity Tier 1 capital minimum requirement |  | $ 627,800 | $ 579,921
Common equity Tier 1 capital minimum requirement |  | 4.50% | 4.50%
Excess Common equtiy Tier 1 capital |  | $ 1,277,020 | $ 1,154,798
Excess Common equtiy Tier 1 capital |  | 9.16% | 8.96%
Tier 1 capital (to risk-weighted assets) |  | $ 1,904,820 | $ 1,734,719
Tier 1 capital (to risk-weighted assets) |  | 13.66% | 13.46%
Tier 1 capital minimum requirement |  | $ 837,067 | $ 773,229
Tier 1 capital minimum requirement |  | 6.00% | 6.00%
Excess Tier 1 capital |  | $ 1,067,753 | $ 961,490
Excess Tier 1 capital |  | 7.66% | 7.46%
Total capital (to risk-weighted assets) |  | $ 2,029,462 | $ 1,862,806
Total capital (to risk-weighted assets) |  | 14.55% | 14.45%
Total capital minimum requirement |  | $ 1,116,089 | $ 1,030,971
Total capital minimum requirement |  | 8.00% | 8.00%
Excess Total capital |  | $ 913,373 | $ 831,835
Excess Total capital |  | 6.55% | 6.45%
Tier 1 capital (to average assets) – Leverage ratio |  | $ 1,904,820 | $ 1,734,719
Tier 1 capital (to average assets) – Leverage ratio |  | 11.89% | 11.82%
Minimum leverage requirement |  | $ 640,807 | $ 586,959
Minimum leverage requirement |  | 4.00% | 4.00%
Excess Tier One Leverage Capital |  | $ 1,264,013 | $ 1,147,760
Excess Tier One Leverage Capital |  | 7.89% | 7.82%
Risk-weighted assets |  | $ 13,949,605 | $ 12,887,142
Total average assets (1) | [1] | $ 16,019,658 | $ 14,673,981
[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 amount by which the company's Tier 1 Risk Based Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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