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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2015
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 a mounts and ratios as of December 31, 2015 and 2014 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, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 846,748 |  | 17.29% |  | $ | 391,723 |  | 8.00% |  | $ | 489,654 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 782,912 |  | 15.99% |  | $ | 293,792 |  | 6.00% |  | $ | 391,723 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 594,482 |  | 12.14% |  | $ | 220,344 |  | 4.50% |  | $ | 318,275 |  | 6.50%
Tier 1 capital to average total assets | $ | 782,912 |  | 11.18% |  | $ | 280,009 |  | 4.00% |  | $ | 350,011 |  | 5.00%
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%
|  |  |  |  |  | Minimum Capital |  | Minimum to be Well
| Actual |  | Requirement |  | Capitalized
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
| (Dollars in thousands)
Bank Ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 815,458 |  | 16.70% |  | $ | 390,688 |  | 8.00% |  | $ | 488,360 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 751,886 |  | 15.40% |  | $ | 293,016 |  | 6.00% |  | $ | 390,688 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 751,886 |  | 15.40% |  | $ | 219,762 |  | 4.50% |  | $ | 317,434 |  | 6.50%
Tier 1 capital to average total assets | $ | 751,886 |  | 10.80% |  | $ | 278,399 |  | 4.00% |  | $ | 347,999 |  | 5.00%
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%

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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