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Note 14 - Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | December 31, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 494,690 |  |  |  | 8.89 | % |  | $ | 472,251 |  |  |  | 9.63 | %
Requirement to be well capitalized |  |  | 278,175 |  |  |  | 5.00 |  |  |  | 245,254 |  |  |  | 5.00 |
Excess |  |  | 216,515 |  |  |  | 3.89 |  |  |  | 226,997 |  |  |  | 4.63 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 494,690 |  |  |  | 12.62 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 254,768 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 239,922 |  |  |  | 6.12 |  |  |  | n/a |  |  |  | n/a |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 494,690 |  |  |  | 12.62 | % |  | $ | 472,251 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 313,560 |  |  |  | 8.00 |  |  |  | 204,354 |  |  |  | 6.00 |
Excess |  |  | 181,130 |  |  |  | 4.62 |  |  |  | 267,897 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 516,226 |  |  |  | 13.17 | % |  | $ | 497,347 |  |  |  | 14.60 | %
Requirement to be well capitalized |  |  | 391,950 |  |  |  | 10.00 |  |  |  | 340,589 |  |  |  | 10.00 |
Excess |  |  | 124,276 |  |  |  | 3.17 |  |  |  | 156,758 |  |  |  | 4.60 |
|  | December 31, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 490,919 |  |  |  | 8.84 | % |  | $ | 471,233 |  |  |  | 9.62 | %
Requirement to be well capitalized |  |  | 277,611 |  |  |  | 5.00 |  |  |  | 244,960 |  |  |  | 5.00 |
Excess |  |  | 213,308 |  |  |  | 3.84 |  |  |  | 226,273 |  |  |  | 4.62 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 462,883 |  |  |  | 11.83 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 254,335 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 208,548 |  |  |  | 5.33 |  |  |  | n/a |  |  |  | n/a |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 490,919 |  |  |  | 12.55 | % |  | $ | 471,233 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 313,028 |  |  |  | 8.00 |  |  |  | 203,878 |  |  |  | 6.00 |
Excess |  |  | 177,891 |  |  |  | 4.55 |  |  |  | 267,355 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 512,454 |  |  |  | 13.10 | % |  | $ | 496,329 |  |  |  | 14.61 | %
Requirement to be well capitalized |  |  | 391,285 |  |  |  | 10.00 |  |  |  | 339,797 |  |  |  | 10.00 |
Excess |  |  | 121,169 |  |  |  | 3.10 |  |  |  | 156,532 |  |  |  | 4.61 |

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