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Note 15 - Regulatory Capital (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Percent of |  |  |  |  |  |  | Percent of |
|  | Amount |  |  | Assets |  |  | Amount |  |  | Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 667,882 |  |  |  | 9.69 | % |  | $ | 660,782 |  |  |  | 9.85 | %
Requirement to be well capitalized |  |  | 344,642 |  |  |  | 5.00 |  |  |  | 335,512 |  |  |  | 5.00 |
Excess |  |  | 323,240 |  |  |  | 4.69 |  |  |  | 325,270 |  |  |  | 4.85 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 667,882 |  |  |  | 12.66 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 342,872 |  |  |  | 6.50 |  |  |  | 323,386 |  |  |  | 6.50 |
Excess |  |  | 325,010 |  |  |  | 6.16 |  |  |  | 337,396 |  |  |  | 6.78 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 667,882 |  |  |  | 12.66 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 421,997 |  |  |  | 8.00 |  |  |  | 398,014 |  |  |  | 8.00 |
Excess |  |  | 245,885 |  |  |  | 4.66 |  |  |  | 262,768 |  |  |  | 5.28 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 689,392 |  |  |  | 13.07 | % |  | $ | 681,727 |  |  |  | 13.70 | %
Requirement to be well capitalized |  |  | 527,496 |  |  |  | 10.00 |  |  |  | 497,517 |  |  |  | 10.00 |
Excess |  |  | 161,896 |  |  |  | 3.07 |  |  |  | 184,210 |  |  |  | 3.70 |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Percent of |  |  |  |  |  |  | Percent of |
|  | Amount |  |  | Assets |  |  | Amount |  |  | Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 600,730 |  |  |  | 8.72 | % |  | $ | 586,582 |  |  |  | 8.74 | %
Requirement to be well capitalized |  |  | 344,637 |  |  |  | 5.00 |  |  |  | 335,616 |  |  |  | 5.00 |
Excess |  |  | 256,093 |  |  |  | 3.72 |  |  |  | 250,966 |  |  |  | 3.74 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 558,848 |  |  |  | 10.60 | % |  | $ | 546,230 |  |  |  | 10.98 | %
Requirement to be well capitalized |  |  | 342,840 |  |  |  | 6.50 |  |  |  | 323,382 |  |  |  | 6.50 |
Excess |  |  | 216,008 |  |  |  | 4.10 |  |  |  | 222,848 |  |  |  | 4.48 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 600,730 |  |  |  | 11.39 | % |  | $ | 586,582 |  |  |  | 11.79 | %
Requirement to be well capitalized |  |  | 421,957 |  |  |  | 8.00 |  |  |  | 398,008 |  |  |  | 8.00 |
Excess |  |  | 178,773 |  |  |  | 3.39 |  |  |  | 188,574 |  |  |  | 3.79 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 697,240 |  |  |  | 13.22 | % |  | $ | 682,527 |  |  |  | 13.72 | %
Requirement to be well capitalized |  |  | 527,446 |  |  |  | 10.00 |  |  |  | 497,511 |  |  |  | 10.00 |
Excess |  |  | 169,794 |  |  |  | 3.22 |  |  |  | 185,016 |  |  |  | 3.72 |

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