FHLB Borrowings (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]

The Company’s FHLB borrowings and weighted average interest rates are summarized below:

   December 31, 2016   December 31, 2015 
   Amount   Rate   Amount   Rate 
   (in thousands) 
Total FHLB borrowings  $461,280    1.55%  $656,587    1.26% 
                     
By remaining period to maturity:                    
One year or less  $231,280    1.02%   270,587    0.64% 
One to two years   130,000    1.84%   156,000    1.13% 
Two to three years   35,000    1.60%   130,000    1.84% 
Three to four years   65,000    2.82%   35,000    1.60% 
Four to five years   -         65,000    2.82% 
Total borrowings  $461,280    1.55%  $656,587    1.26%