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Note 15 - Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | September 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Percent of |  |  |  |  |  |  | Percent of |
|  | Amount |  |  | Assets |  |  | Amount |  |  | Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 673,084 |  |  |  | 9.66 | % |  | $ | 660,782 |  |  |  | 9.85 | %
Requirement to be well capitalized |  |  | 348,415 |  |  |  | 5.00 |  |  |  | 335,512 |  |  |  | 5.00 |
Excess |  |  | 324,669 |  |  |  | 4.66 |  |  |  | 325,270 |  |  |  | 4.85 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 673,084 |  |  |  | 12.79 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 342,103 |  |  |  | 6.50 |  |  |  | 323,386 |  |  |  | 6.50 |
Excess |  |  | 330,981 |  |  |  | 6.29 |  |  |  | 337,396 |  |  |  | 6.78 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 673,084 |  |  |  | 12.79 | % |  | $ | 660,782 |  |  |  | 13.28 | %
Requirement to be well capitalized |  |  | 421,049 |  |  |  | 8.00 |  |  |  | 398,014 |  |  |  | 8.00 |
Excess |  |  | 252,035 |  |  |  | 4.79 |  |  |  | 262,768 |  |  |  | 5.28 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 695,120 |  |  |  | 13.21 | % |  | $ | 681,727 |  |  |  | 13.70 | %
Requirement to be well capitalized |  |  | 526,312 |  |  |  | 10.00 |  |  |  | 497,517 |  |  |  | 10.00 |
Excess |  |  | 168,808 |  |  |  | 3.21 |  |  |  | 184,210 |  |  |  | 3.70 |
|  | September 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Percent of |  |  |  |  |  |  | Percent of |
|  | Amount |  |  | Assets |  |  | Amount |  |  | Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 606,844 |  |  |  | 8.71 | % |  | $ | 586,582 |  |  |  | 8.74 | %
Requirement to be well capitalized |  |  | 348,355 |  |  |  | 5.00 |  |  |  | 335,616 |  |  |  | 5.00 |
Excess |  |  | 258,489 |  |  |  | 3.71 |  |  |  | 250,966 |  |  |  | 3.74 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 564,466 |  |  |  | 10.73 | % |  | $ | 546,230 |  |  |  | 10.98 | %
Requirement to be well capitalized |  |  | 342,078 |  |  |  | 6.50 |  |  |  | 323,382 |  |  |  | 6.50 |
Excess |  |  | 222,388 |  |  |  | 4.23 |  |  |  | 222,848 |  |  |  | 4.48 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 606,844 |  |  |  | 11.53 | % |  | $ | 586,582 |  |  |  | 11.79 | %
Requirement to be well capitalized |  |  | 421,019 |  |  |  | 8.00 |  |  |  | 398,008 |  |  |  | 8.00 |
Excess |  |  | 185,825 |  |  |  | 3.53 |  |  |  | 188,574 |  |  |  | 3.79 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 703,879 |  |  |  | 13.37 | % |  | $ | 682,527 |  |  |  | 13.72 | %
Requirement to be well capitalized |  |  | 526,274 |  |  |  | 10.00 |  |  |  | 497,511 |  |  |  | 10.00 |
Excess |  |  | 177,605 |  |  |  | 3.37 |  |  |  | 185,016 |  |  |  | 3.72 |

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