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Note 15 - Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | September 30, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 488,327 |  |  |  | 9.02 | % |  | $ | 472,251 |  |  |  | 9.63 | %
Requirement to be well capitalized |  |  | 270,676 |  |  |  | 5.00 |  |  |  | 245,254 |  |  |  | 5.00 |
Excess |  |  | 217,651 |  |  |  | 4.02 |  |  |  | 226,997 |  |  |  | 4.63 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 488,327 |  |  |  | 12.86 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 246,781 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 241,546 |  |  |  | 6.36 |  |  |  | n/a |  |  |  | n/a |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 488,327 |  |  |  | 12.86 | % |  | $ | 472,251 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 303,731 |  |  |  | 8.00 |  |  |  | 204,345 |  |  |  | 6.00 |
Excess |  |  | 184,596 |  |  |  | 4.86 |  |  |  | 267,906 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 511,300 |  |  |  | 13.47 | % |  | $ | 497,347 |  |  |  | 14.60 | %
Requirement to be well capitalized |  |  | 379,664 |  |  |  | 10.00 |  |  |  | 340,589 |  |  |  | 10.00 |
Excess |  |  | 131,636 |  |  |  | 3.47 |  |  |  | 156,758 |  |  |  | 4.60 |
|  | September 30, 2015 |  | December 31, 2014
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 482,684 |  |  |  | 8.93 | % |  | $ | 471,233 |  |  |  | 9.62 | %
Requirement to be well capitalized |  |  | 270,288 |  |  |  | 5.00 |  |  |  | 244,960 |  |  |  | 5.00 |
Excess |  |  | 212,396 |  |  |  | 3.93 |  |  |  | 226,273 |  |  |  | 4.62 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 455,153 |  |  |  | 12.01 | % |  |  | n/a |  |  |  | n/a |
Requirement to be well capitalized |  |  | 246,358 |  |  |  | 6.50 |  |  |  | n/a |  |  |  | n/a |
Excess |  |  | 208,795 |  |  |  | 5.51 |  |  |  | n/a |  |  |  | n/a |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 482,684 |  |  |  | 12.74 | % |  | $ | 471,233 |  |  |  | 13.87 | %
Requirement to be well capitalized |  |  | 303,209 |  |  |  | 8.00 |  |  |  | 203,878 |  |  |  | 6.00 |
Excess |  |  | 179,475 |  |  |  | 4.74 |  |  |  | 267,355 |  |  |  | 7.87 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 505,657 |  |  |  | 13.34 | % |  | $ | 496,329 |  |  |  | 14.61 | %
Requirement to be well capitalized |  |  | 379,012 |  |  |  | 10.00 |  |  |  | 339,797 |  |  |  | 10.00 |
Excess |  |  | 126,645 |  |  |  | 3.34 |  |  |  | 156,532 |  |  |  | 4.61 |

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