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Note 22 - Regulatory Matters - Capital Amounts and Ratios for the Company and Bank (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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CET1 capital (to risk weighted aseets) minimum required for capital adequacy purposes |  | 5.125% |  | 4.50%
CET1 capital (to risk weighted aseets) to be well capitalized under prompt corrective action regulations | [1] | 6.50% |  | 6.50%
Total capital (to risk weighted assets) minimum required for capital adequacy purposes |  | 8.625% |  | 8.00%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations | [1] | 10.00% |  | 10.00%
Tier 1 capital (to risk weighted assets) minimum required for capital adequacy purposes |  | 6.625% |  | 6.00%
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations | [1] | 8.00% |  | 8.00%
Tier 1 capital (to average assets) minimum required for capital adequacy purposes |  | 5.00% |  | 4.00%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action regulations |  | 5.00% | [1] | 5.00%
Parent Company [Member] |  |  |  |
CET1 capital (to risk weighted aseets) actual amount |  | $ 737,512 |  | $ 632,408
CET1 capital (to risk weighted aseets) actual ratio |  | 10.80% |  | 10.68%
Total capital (to risk weighted assets) actual amount |  | $ 1,016,712 |  | $ 755,212
Total capital (to risk weighted assets) actual ratio |  | 14.89% |  | 12.75%
Tier 1 capital (to risk weighted assets) actual amount |  | $ 737,512 |  | $ 632,408
Tier 1 capital (to risk weighted assets) actual ratio |  | 10.80% |  | 10.68%
Tier 1 capital (to average assets) actual amount |  | $ 737,512 |  | $ 632,408
Tier 1 capital (to average assets) actual ratio |  | 10.72% |  | 10.90%
Bank [Member] |  |  |  |
CET1 capital (to risk weighted aseets) actual amount |  | $ 854,226 |  | $ 620,879
CET1 capital (to risk weighted aseets) actual ratio |  | 12.55% |  | 10.52%
Total capital (to risk weighted assets) actual amount |  | $ 913,100 |  | $ 673,442
Total capital (to risk weighted assets) actual ratio |  | 13.41% |  | 11.41%
Tier 1 capital (to risk weighted assets) actual amount |  | $ 854,226 |  | $ 620,879
Tier 1 capital (to risk weighted assets) actual ratio |  | 12.55% |  | 10.52%
Tier 1 capital (to average assets) actual amount |  | $ 854,226 |  | $ 620,879
Tier 1 capital (to average assets) actual ratio |  | 12.44% |  | 10.74%
[1] | Applies to Bank only

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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