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Note 14 - Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | December 31, 2014 |  |  | December 31, 2013 |
|  | Amount |  |  | Percent of Assets |  |  | Amount |  |  | Percent of Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 472,251 |  |  |  | 9.63 | % |  | $ | 447,305 |  |  |  | 9.48 | %
Requirement to be well capitalized |  |  | 245,254 |  |  |  | 5.00 |  |  |  | 235,992 |  |  |  | 5.00 |
Excess |  |  | 226,997 |  |  |  | 4.63 |  |  |  | 211,313 |  |  |  | 4.48 |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 472,251 |  |  |  | 13.87 | % |  | $ | 447,305 |  |  |  | 14.59 | %
Requirement to be well capitalized |  |  | 204,354 |  |  |  | 6.00 |  |  |  | 183,944 |  |  |  | 6.00 |
Excess |  |  | 267,897 |  |  |  | 7.87 |  |  |  | 263,361 |  |  |  | 8.59 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 497,347 |  |  |  | 14.60 | % |  | $ | 479,081 |  |  |  | 15.63 | %
Requirement to be well capitalized |  |  | 340,589 |  |  |  | 10.00 |  |  |  | 306,573 |  |  |  | 10.00 |
Excess |  |  | 156,758 |  |  |  | 4.60 |  |  |  | 172,508 |  |  |  | 5.63 |
|  | December 31, 2014 |  |  | December 31, 2013 |
|  | Amount |  |  | Percent of Assets |  |  | Amount |  |  | Percent of Assets |
|  | (Dollars in thousands) |
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 471,233 |  |  |  | 9.62 | % |  | $ | 456,772 |  |  |  | 9.70 | %
Requirement to be well capitalized |  |  | 244,960 |  |  |  | 5.00 |  |  |  | 235,547 |  |  |  | 5.00 |
Excess |  |  | 226,273 |  |  |  | 4.62 |  |  |  | 221,225 |  |  |  | 4.70 |
Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 471,233 |  |  |  | 13.87 | % |  | $ | 456,772 |  |  |  | 14.93 | %
Requirement to be well capitalized |  |  | 203,878 |  |  |  | 6.00 |  |  |  | 183,579 |  |  |  | 6.00 |
Excess |  |  | 267,355 |  |  |  | 7.87 |  |  |  | 273,193 |  |  |  | 8.93 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 496,329 |  |  |  | 14.61 | % |  | $ | 488,548 |  |  |  | 15.97 | %
Requirement to be well capitalized |  |  | 339,797 |  |  |  | 10.00 |  |  |  | 305,966 |  |  |  | 10.00 |
Excess |  |  | 156,532 |  |  |  | 4.61 |  |  |  | 182,582 |  |  |  | 5.97 |

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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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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=35709795&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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 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=35709795&loc=SL5958577-112826 + Details
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