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Note 15 - Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | September 30, 2016 |  | December 31, 2015
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 528,168 |  |  |  | 8.88 | % |  | $ | 494,690 |  |  |  | 8.89 | %
Requirement to be well capitalized |  |  | 297,261 |  |  |  | 5.00 |  |  |  | 278,175 |  |  |  | 5.00 |
Excess |  |  | 230,907 |  |  |  | 3.88 |  |  |  | 216,515 |  |  |  | 3.89 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 528,168 |  |  |  | 12.44 | % |  | $ | 494,690 |  |  |  | 12.62 |
Requirement to be well capitalized |  |  | 275,911 |  |  |  | 6.50 |  |  |  | 254,768 |  |  |  | 6.50 |
Excess |  |  | 252,257 |  |  |  | 5.94 |  |  |  | 239,922 |  |  |  | 6.12 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 528,168 |  |  |  | 12.44 | % |  | $ | 494,690 |  |  |  | 12.62 | %
Requirement to be well capitalized |  |  | 339,583 |  |  |  | 8.00 |  |  |  | 313,560 |  |  |  | 8.00 |
Excess |  |  | 188,585 |  |  |  | 4.44 |  |  |  | 181,130 |  |  |  | 4.62 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 549,963 |  |  |  | 12.96 | % |  | $ | 516,226 |  |  |  | 13.17 | %
Requirement to be well capitalized |  |  | 424,479 |  |  |  | 10.00 |  |  |  | 391,950 |  |  |  | 10.00 |
Excess |  |  | 125,484 |  |  |  | 2.96 |  |  |  | 124,276 |  |  |  | 3.17 |
|  | September 30, 2016 |  | December 31, 2015
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 523,428 |  |  |  | 8.80 | % |  | $ | 490,919 |  |  |  | 8.84 | %
Requirement to be well capitalized |  |  | 297,458 |  |  |  | 5.00 |  |  |  | 277,611 |  |  |  | 5.00 |
Excess |  |  | 225,970 |  |  |  | 3.80 |  |  |  | 213,308 |  |  |  | 3.84 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 496,605 |  |  |  | 11.72 | % |  | $ | 462,883 |  |  |  | 11.83 |
Requirement to be well capitalized |  |  | 275,404 |  |  |  | 6.50 |  |  |  | 254,335 |  |  |  | 6.50 |
Excess |  |  | 221,201 |  |  |  | 5.22 |  |  |  | 208,548 |  |  |  | 5.33 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 523,428 |  |  |  | 12.35 | % |  | $ | 490,919 |  |  |  | 12.55 | %
Requirement to be well capitalized |  |  | 338,958 |  |  |  | 8.00 |  |  |  | 313,028 |  |  |  | 8.00 |
Excess |  |  | 184,470 |  |  |  | 4.35 |  |  |  | 177,891 |  |  |  | 4.55 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 545,223 |  |  |  | 12.87 | % |  | $ | 512,454 |  |  |  | 13.10 | %
Requirement to be well capitalized |  |  | 423,698 |  |  |  | 10.00 |  |  |  | 391,285 |  |  |  | 10.00 |
Excess |  |  | 121,525 |  |  |  | 2.87 |  |  |  | 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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