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Note 15 - Regulatory Capital (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | June 30, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 483,407 |  |  |  | 9.13 | % |  | $ | 472,251 |  |  |  | 9.63 | %
Requirement to be well capitalized |  |  | 264,746 |  |  |  | 5.00 |  |  |  | 245,254 |  |  |  | 5.00 |
Excess |  |  | 218,661 |  |  |  | 4.13 |  |  |  | 226,997 |  |  |  | 4.63 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 483,407 |  |  |  | 13.07 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 240,326 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 243,081 |  |  |  | 6.57 |  |  |  | n/a |  |  |  | n/a |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 483,407 |  |  |  | 13.07 | % |  | $ | 472,251 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 295,786 |  |  |  | 8.00 |  |  |  | 204,345 |  |  |  | 6.00 |
Excess |  |  | 187,621 |  |  |  | 5.07 |  |  |  | 267,906 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 506,491 |  |  |  | 13.70 | % |  | $ | 497,347 |  |  |  | 14.60 | %
Requirement to be well capitalized |  |  | 369,732 |  |  |  | 10.00 |  |  |  | 340,589 |  |  |  | 10.00 |
Excess |  |  | 136,759 |  |  |  | 3.70 |  |  |  | 156,758 |  |  |  | 4.60 |
|  | June 30, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 478,658 |  |  |  | 9.06 | % |  | $ | 471,233 |  |  |  | 9.62 | %
Requirement to be well capitalized |  |  | 264,295 |  |  |  | 5.00 |  |  |  | 244,960 |  |  |  | 5.00 |
Excess |  |  | 214,363 |  |  |  | 4.06 |  |  |  | 226,273 |  |  |  | 4.62 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 450,169 |  |  |  | 12.20 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 239,927 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 210,242 |  |  |  | 5.70 |  |  |  | n/a |  |  |  | n/a |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 478,658 |  |  |  | 12.97 | % |  | $ | 471,233 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 295,295 |  |  |  | 8.00 |  |  |  | 203,878 |  |  |  | 6.00 |
Excess |  |  | 183,363 |  |  |  | 4.97 |  |  |  | 267,355 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 501,742 |  |  |  | 13.59 | % |  | $ | 496,329 |  |  |  | 14.61 | %
Requirement to be well capitalized |  |  | 369,119 |  |  |  | 10.00 |  |  |  | 339,797 |  |  |  | 10.00 |
Excess |  |  | 132,623 |  |  |  | 3.59 |  |  |  | 156,532 |  |  |  | 4.61 |

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