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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]

The change in goodwill during the year is as follows:

 

   2018   2017 
   (dollars in thousands) 
Balance, January 1  $145,909   $145,909 
Acquired goodwill   -    - 
Impairment   -    - 
Balance, December 31  $145,909   $145,909 
Intangible Assets Disclosure [Text Block]

The table below provides information regarding the carrying amounts and accumulated amortization of total amortized intangible assets as of the dates set forth below. 

 

   Gross
Carrying
Amount		   Accumulated
Amortization		   Net
Carrying
Amount		 
   (dollars in thousands) 
As of December 31, 2018            
Core deposit intangibles  $6,011   $(4,274)   $1,737 
As of December 31, 2017               
Core deposit intangibles  $6,011   $(3,647)   $2,364 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Aggregate amortization expense was approximately $627,000, $724,000 and $820,000 for 2018, 2017 and 2016, respectively. Estimated amortization expense for each of the next five years (dollars in thousands):

 

2019  $531 
2020   434 
2021   338 
2022   241 
2023   145