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Note 15 - Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2016
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | March 31, 2016 |  | December 31, 2015
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 498,308 |  |  |  | 8.65 | % |  | $ | 494,690 |  |  |  | 8.89 | %
Requirement to be well capitalized |  |  | 288,017 |  |  |  | 5.00 |  |  |  | 278,175 |  |  |  | 5.00 |
Excess |  |  | 210,291 |  |  |  | 3.65 |  |  |  | 216,515 |  |  |  | 3.89 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 498,308 |  |  |  | 12.51 | % |  | $ | 494,690 |  |  |  | 12.62 |
Requirement to be well capitalized |  |  | 258,947 |  |  |  | 6.50 |  |  |  | 254,768 |  |  |  | 6.50 |
Excess |  |  | 239,361 |  |  |  | 6.01 |  |  |  | 239,922 |  |  |  | 6.12 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 498,308 |  |  |  | 12.51 | % |  | $ | 494,690 |  |  |  | 12.62 | %
Requirement to be well capitalized |  |  | 318,703 |  |  |  | 8.00 |  |  |  | 313,560 |  |  |  | 8.00 |
Excess |  |  | 179,605 |  |  |  | 4.51 |  |  |  | 181,130 |  |  |  | 4.62 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 520,300 |  |  |  | 13.06 | % |  | $ | 516,226 |  |  |  | 13.17 | %
Requirement to be well capitalized |  |  | 398,379 |  |  |  | 10.00 |  |  |  | 391,950 |  |  |  | 10.00 |
Excess |  |  | 121,921 |  |  |  | 3.06 |  |  |  | 124,276 |  |  |  | 3.17 |
|  | March 31, 2016 |  | December 31, 2015
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 497,698 |  |  |  | 8.65 | % |  | $ | 490,919 |  |  |  | 8.84 | %
Requirement to be well capitalized |  |  | 287,543 |  |  |  | 5.00 |  |  |  | 277,611 |  |  |  | 5.00 |
Excess |  |  | 210,155 |  |  |  | 3.65 |  |  |  | 213,308 |  |  |  | 3.84 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 470,685 |  |  |  | 11.84 | % |  | $ | 462,883 |  |  |  | 11.83 |
Requirement to be well capitalized |  |  | 258,443 |  |  |  | 6.50 |  |  |  | 254,335 |  |  |  | 6.50 |
Excess |  |  | 212,242 |  |  |  | 5.34 |  |  |  | 208,548 |  |  |  | 5.33 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 497,698 |  |  |  | 12.52 | % |  | $ | 490,919 |  |  |  | 12.55 | %
Requirement to be well capitalized |  |  | 318,084 |  |  |  | 8.00 |  |  |  | 313,028 |  |  |  | 8.00 |
Excess |  |  | 179,614 |  |  |  | 4.52 |  |  |  | 177,891 |  |  |  | 4.55 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 519,691 |  |  |  | 13.07 | % |  | $ | 512,454 |  |  |  | 13.10 | %
Requirement to be well capitalized |  |  | 397,605 |  |  |  | 10.00 |  |  |  | 391,285 |  |  |  | 10.00 |
Excess |  |  | 122,086 |  |  |  | 3.07 |  |  |  | 121,169 |  |  |  | 3.10 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: 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 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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