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Note 7 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure Text Block [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   

Gross

                   

Net

 
   

Intangible

   

Additions/

   

Accumulated

   

Intangible

 

(dollars in thousands)

 

Assets

   

(Adjustments)

   

Amortization

   

Assets

 
                                 

December 31, 2015

                               

Goodwill (1)

  $ 104,425     $ (257 )   $ -     $ 104,168  

Core deposit (2)

    7,070       -       (3,084 )     3,986  

Excess servicing (3)

    282       379       (274 )     387  
    $ 111,777     $ 122     $ (3,358 )   $ 108,541  
                                 

December 31, 2014

                               

Goodwill (1)

  $ 2,163     $ 102,262     $ -     $ 104,425  

Core deposit (2)

    2,520       4,550       (1,869 )     5,201  

Excess servicing (3)

    865       330       (913 )     282  
    $ 5,548     $ 107,142     $ (2,782 )   $ 109,908  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years Ending December 31:

       

(dollars in thousands)

       
         

2016

  $ 1,207  

2017

    1,064  

2018

    957  

2019

    715  

2020

    43  

Thereafter

    -  

Total

  $ 3,986