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Note 15 - Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | March 31, 2019 |  | December 31, 2018
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 663,467 |  |  |  | 9.64 | % |  | $ | 660,782 |  |  |  | 9.85 | %
Requirement to be well capitalized |  |  | 344,216 |  |  |  | 5.00 |  |  |  | 335,512 |  |  |  | 5.00 |
Excess |  |  | 319,251 |  |  |  | 4.64 |  |  |  | 325,270 |  |  |  | 4.85 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 663,467 |  |  |  | 13.08 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 329,701 |  |  |  | 6.50 |  |  |  | 323,386 |  |  |  | 6.50 |
Excess |  |  | 333,766 |  |  |  | 6.58 |  |  |  | 337,396 |  |  |  | 6.78 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 663,467 |  |  |  | 13.08 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 405,786 |  |  |  | 8.00 |  |  |  | 398,014 |  |  |  | 8.00 |
Excess |  |  | 257,681 |  |  |  | 5.08 |  |  |  | 262,768 |  |  |  | 5.28 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 684,482 |  |  |  | 13.49 | % |  | $ | 681,727 |  |  |  | 13.70 | %
Requirement to be well capitalized |  |  | 507,232 |  |  |  | 10.00 |  |  |  | 497,517 |  |  |  | 10.00 |
Excess |  |  | 177,250 |  |  |  | 3.49 |  |  |  | 184,210 |  |  |  | 3.70 |
|  | March 31, 2019 |  | December 31, 2018
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 594,196 |  |  |  | 8.63 | % |  | $ | 586,582 |  |  |  | 8.74 | %
Requirement to be well capitalized |  |  | 344,147 |  |  |  | 5.00 |  |  |  | 335,616 |  |  |  | 5.00 |
Excess |  |  | 250,049 |  |  |  | 3.63 |  |  |  | 250,966 |  |  |  | 3.74 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 552,793 |  |  |  | 10.90 | % |  | $ | 546,230 |  |  |  | 10.98 | %
Requirement to be well capitalized |  |  | 329,661 |  |  |  | 6.50 |  |  |  | 323,382 |  |  |  | 6.50 |
Excess |  |  | 223,132 |  |  |  | 4.40 |  |  |  | 222,848 |  |  |  | 4.48 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 594,196 |  |  |  | 11.72 | % |  | $ | 586,582 |  |  |  | 11.79 | %
Requirement to be well capitalized |  |  | 405,737 |  |  |  | 8.00 |  |  |  | 398,008 |  |  |  | 8.00 |
Excess |  |  | 188,459 |  |  |  | 3.72 |  |  |  | 188,574 |  |  |  | 3.79 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 690,211 |  |  |  | 13.61 | % |  | $ | 682,527 |  |  |  | 13.72 | %
Requirement to be well capitalized |  |  | 507,171 |  |  |  | 10.00 |  |  |  | 497,511 |  |  |  | 10.00 |
Excess |  |  | 183,040 |  |  |  | 3.61 |  |  |  | 185,016 |  |  |  | 3.72 |

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