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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
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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The amount of CET1 capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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