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Note 20 - Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
   

Company

   

Bank

   

For Capital

Adequacy

   

To Be Well Capitalized Under

 

(dollars in thousands)

 

Actual

Amount

   

Ratio

   

Actual

Amount

   

Ratio

   

Purposes Ratio

   

Prompt Corrective Action

Provision Ratio *

 
                                                 

As of December 31, 2014

                                               

Total capital (to risk weighted assets)

  $ 631,340       12.97 %   $ 568,637       11.73 %     8.0 %     10.0 %

Tier 1 capital (to risk weighted assets)

    505,864       10.39 %     522,637       10.78 %     4.0 %     6.0 %

Tier 1 capital (to average assets)

    505,864       10.69 %     522,637       11.09 %     3.0 %     5.0 %
                                                 

As of December 31, 2013

                                               

Total capital (to risk weighted assets)

  $ 440,332       13.01 %   $ 403,910       12.00 %     8.0 %     10.0 %

Tier 1 capital (to risk weighted assets)

    390,111       11.53 %     363,166       10.79 %     4.0 %     6.0 %

Tier 1 capital (to average assets)

    390,111       10.93 %     363,166       10.22 %     3.0 %     5.0 %