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

The Company's and the Bank's actual capital amounts and ratios as of December 31, 2014 and December 31, 2013 are as follows:

      Minimum Capital Minimum to be Well
 Actual  Requirement Capitalized
 Amount  Ratio  Amount  Ratio   Amount Ratio
 (Dollars in thousands)
Company Ratios              
As of December 31, 2014              
Total capital to risk-weighted assets$ 851,437 17.57% $ 387,772 8.00% $ 484,715 10.00%
Tier 1 capital to risk-weighted assets$ 776,525 16.02% $ 193,886 4.00% $ 290,829 6.00%
Tier 1 capital to average total assets$ 776,525 10.61% $ 292,738 4.00% $ 365,922 5.00%
As of December 31, 2013              
Total capital to risk-weighted assets$ 827,459 16.16% $ 409,514 8.00% $ 511,893 10.00%
Tier 1 capital to risk-weighted assets$ 736,106 14.38% $ 204,757 4.00% $ 307,136 6.00%
Tier 1 capital to average total assets$ 736,106 9.06% $ 324,910 4.00% $ 406,138 5.00%

               
               
      Minimum Capital Minimum to be Well
 Actual  Requirement Capitalized
 Amount  Ratio  Amount  Ratio  Amount  Ratio
 (Dollars in thousands)
Bank Ratios              
As of December 31, 2014              
Total capital to risk-weighted assets$ 820,884 16.99% $ 386,444 8.00% $ 483,055 10.00%
Tier 1 capital to risk-weighted assets$ 746,177 15.45% $ 193,222 4.00% $ 289,833 6.00%
Tier 1 capital to average total assets$ 746,177 10.26% $ 290,879 4.00% $ 363,599 5.00%
As of December 31, 2013              
Total capital to risk-weighted assets$ 779,414 15.30% $ 407,637 8.00% $ 509,547 10.00%
Tier 1 capital to risk-weighted assets$ 688,349 13.51% $ 203,819 4.00% $ 305,728 6.00%
Tier 1 capital to average total assets$ 688,349 8.54% $ 322,395 4.00% $ 402,993 5.00%