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Note 14 - Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | March 31, 2017 |  | December 31, 2016
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 616,017 |  |  |  | 9.98 | % |  | $ | 607,033 |  |  |  | 10.12 | %
Requirement to be well capitalized |  |  | 308,535 |  |  |  | 5.00 |  |  |  | 299,848 |  |  |  | 5.00 |
Excess |  |  | 307,482 |  |  |  | 4.98 |  |  |  | 307,185 |  |  |  | 5.12 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 616,017 |  |  |  | 13.80 | % |  | $ | 607,033 |  |  |  | 14.12 | %
Requirement to be well capitalized |  |  | 290,046 |  |  |  | 6.50 |  |  |  | 279,443 |  |  |  | 6.50 |
Excess |  |  | 325,971 |  |  |  | 7.30 |  |  |  | 327,590 |  |  |  | 7.62 |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 616,017 |  |  |  | 13.80 | % |  | $ | 607,033 |  |  |  | 14.12 | %
Requirement to be well capitalized |  |  | 356,980 |  |  |  | 8.00 |  |  |  | 343,930 |  |  |  | 8.00 |
Excess |  |  | 259,037 |  |  |  | 5.80 |  |  |  | 263,103 |  |  |  | 6.12 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 638,228 |  |  |  | 14.30 | % |  | $ | 629,262 |  |  |  | 14.64 | %
Requirement to be well capitalized |  |  | 446,225 |  |  |  | 10.00 |  |  |  | 429,913 |  |  |  | 10.00 |
Excess |  |  | 192,003 |  |  |  | 4.30 |  |  |  | 199,349 |  |  |  | 4.64 |
|  | March 31, 2017 |  | December 31, 2016
|  | Amount |  | Percent of Assets |  | Amount |  | Percent of Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 550,055 |  |  |  | 8.92 | % |  | $ | 539,228 |  |  |  | 9.00 | %
Requirement to be well capitalized |  |  | 308,284 |  |  |  | 5.00 |  |  |  | 299,654 |  |  |  | 5.00 |
Excess |  |  | 241,771 |  |  |  | 3.92 |  |  |  | 239,574 |  |  |  | 4.00 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 516,706 |  |  |  | 11.59 | % |  | $ | 506,432 |  |  |  | 11.79 | %
Requirement to be well capitalized |  |  | 289,733 |  |  |  | 6.50 |  |  |  | 279,121 |  |  |  | 6.50 |
Excess |  |  | 226,973 |  |  |  | 5.09 |  |  |  | 227,311 |  |  |  | 5.29 |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 550,055 |  |  |  | 12.34 | % |  | $ | 539,228 |  |  |  | 12.56 | %
Requirement to be well capitalized |  |  | 356,594 |  |  |  | 8.00 |  |  |  | 343,534 |  |  |  | 8.00 |
Excess |  |  | 193,461 |  |  |  | 4.34 |  |  |  | 195,694 |  |  |  | 4.56 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 647,266 |  |  |  | 14.52 | % |  | $ | 636,457 |  |  |  | 14.82 | %
Requirement to be well capitalized |  |  | 445,743 |  |  |  | 10.00 |  |  |  | 429,417 |  |  |  | 10.00 |
Excess |  |  | 201,523 |  |  |  | 4.52 |  |  |  | 207,040 |  |  |  | 4.82 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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