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Note 22 - Regulatory Matters (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] |
|  | As of December 31, 2014 |  |  | As of December 31, 2013 |
|  | Company |  |  | Bank |  |  | Company |  |  | Bank |
|  | Balance |  |  | Percentage |  |  | Balance |  |  | Percentage |  |  | Balance |  |  | Percentage |  |  | Balance |  |  | Percentage |
|  | (Dollars in thousands) |
Tier I Capital (to risk- weighted assets) |  | $ | 1,406,511 |  |  |  | 14.96 | % |  | $ | 1,353,481 |  |  |  | 14.42 | % |  | $ | 1,288,892 |  |  |  | 15.04 | % |  | $ | 1,244,480 |  |  |  | 14.53 | %
Tier I Capital minimum requirement |  |  | 376,072 |  |  |  | 4.00 |  |  |  | 375,318 |  |  |  | 4.00 |  |  |  | 342,899 |  |  |  | 4.00 |  |  |  | 342,701 |  |  |  | 4.00 |
Excess |  | $ | 1,030,439 |  |  |  | 10.96 | % |  | $ | 978,163 |  |  |  | 10.42 | % |  | $ | 945,993 |  |  |  | 11.04 | % |  | $ | 901,779 |  |  |  | 10.53 | %
Total Capital (to risk- weighted assets) |  | $ | 1,524,702 |  |  |  | 16.22 | % |  | $ | 1,471,337 |  |  |  | 15.68 | % |  | $ | 1,401,319 |  |  |  | 16.35 | % |  | $ | 1,352,415 |  |  |  | 15.79 | %
Total Capital minimum requirement |  |  | 752,144 |  |  |  | 8.00 |  |  |  | 750,637 |  |  |  | 8.00 |  |  |  | 685,799 |  |  |  | 8.00 |  |  |  | 685,402 |  |  |  | 8.00 |
Excess |  | $ | 772,558 |  |  |  | 8.22 | % |  | $ | 720,700 |  |  |  | 7.68 | % |  | $ | 715,520 |  |  |  | 8.35 | % |  | $ | 667,013 |  |  |  | 7.79 | %
Tier I Capital (to average assets) Leverage ratio |  | $ | 1,406,511 |  |  |  | 12.99 | % |  | $ | 1,353,481 |  |  |  | 12.52 | % |  | $ | 1,288,892 |  |  |  | 12.48 | % |  | $ | 1,244,480 |  |  |  | 12.06 | %
Minimum leverage requirement |  |  | 433,121 |  |  |  | 4.00 |  |  |  | 432,350 |  |  |  | 4.00 |  |  |  | 413,158 |  |  |  | 4.00 |  |  |  | 412,815 |  |  |  | 4.00 |
Excess |  | $ | 973,390 |  |  |  | 8.99 | % |  | $ | 921,131 |  |  |  | 8.52 | % |  | $ | 875,734 |  |  |  | 8.48 | % |  | $ | 831,665 |  |  |  | 8.06 | %
Total average assets (1) |  | $ | 10,828,015 |  |  |  |  |  |  | $ | 10,808,747 |  |  |  |  |  |  | $ | 10,328,952 |  |  |  |  |  |  | $ | 10,320,368 |  |  |  |  |
Risk-weighted assets |  | $ | 9,401,803 |  |  |  |  |  |  | $ | 9,382,961 |  |  |  |  |  |  | $ | 8,572,487 |  |  |  |  |  |  | $ | 8,567,523 |  |  |  |  |

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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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