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Note 14 - Regulatory Capital (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | June 30, 2017 |  | December 31, 2016
|  |  |  | Percent of |  |  |  | Percent of
|  | Amount |  | Assets |  | Amount |  | Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 624,074 |  |  |  | 10.04 | % |  | $ | 607,033 |  |  |  | 10.12 | %
Requirement to be well capitalized |  |  | 310,889 |  |  |  | 5.00 |  |  |  | 299,848 |  |  |  | 5.00 |
Excess |  |  | 313,185 |  |  |  | 5.04 |  |  |  | 307,185 |  |  |  | 5.12 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 624,074 |  |  |  | 13.58 | % |  | $ | 607,033 |  |  |  | 14.12 | %
Requirement to be well capitalized |  |  | 298,648 |  |  |  | 6.50 |  |  |  | 279,443 |  |  |  | 6.50 |
Excess |  |  | 325,426 |  |  |  | 7.08 |  |  |  | 327,590 |  |  |  | 7.62 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 624,074 |  |  |  | 13.58 | % |  | $ | 607,033 |  |  |  | 14.12 | %
Requirement to be well capitalized |  |  | 367,567 |  |  |  | 8.00 |  |  |  | 343,930 |  |  |  | 8.00 |
Excess |  |  | 256,507 |  |  |  | 5.58 |  |  |  | 263,103 |  |  |  | 6.12 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 646,231 |  |  |  | 14.07 | % |  | $ | 629,262 |  |  |  | 14.64 | %
Requirement to be well capitalized |  |  | 459,459 |  |  |  | 10.00 |  |  |  | 429,913 |  |  |  | 10.00 |
Excess |  |  | 186,772 |  |  |  | 4.07 |  |  |  | 199,349 |  |  |  | 4.64 |
|  | June 30, 2017 |  | December 31, 2016
|  |  |  | Percent of |  |  |  | Percent of
|  | Amount |  | Assets |  | Amount |  | Assets
|  | (Dollars in thousands)
Tier I (leverage) capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 558,756 |  |  |  | 9.00 | % |  | $ | 539,228 |  |  |  | 9.00 | %
Requirement to be well capitalized |  |  | 310,554 |  |  |  | 5.00 |  |  |  | 299,654 |  |  |  | 5.00 |
Excess |  |  | 248,202 |  |  |  | 4.00 |  |  |  | 239,574 |  |  |  | 4.00 |
Common Equity Tier I risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 524,830 |  |  |  | 11.43 | % |  | $ | 506,432 |  |  |  | 11.79 | %
Requirement to be well capitalized |  |  | 298,350 |  |  |  | 6.50 |  |  |  | 279,121 |  |  |  | 6.50 |
Excess |  |  | 226,480 |  |  |  | 4.93 |  |  |  | 227,311 |  |  |  | 5.29 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 558,756 |  |  |  | 12.17 | % |  | $ | 539,228 |  |  |  | 12.56 | %
Requirement to be well capitalized |  |  | 367,199 |  |  |  | 8.00 |  |  |  | 343,534 |  |  |  | 8.00 |
Excess |  |  | 191,557 |  |  |  | 4.17 |  |  |  | 195,694 |  |  |  | 4.56 |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital level |  | $ | 655,913 |  |  |  | 14.29 | % |  | $ | 636,457 |  |  |  | 14.82 | %
Requirement to be well capitalized |  |  | 458,999 |  |  |  | 10.00 |  |  |  | 429,417 |  |  |  | 10.00 |
Excess |  |  | 196,914 |  |  |  | 4.29 |  |  |  | 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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