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Regulatory Capital Requirements (Tables) | 6 Months Ended
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Jun. 30, 2017
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 June 30, 2017 and December 31, 2016 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 June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 896,927 |  | 20.42% |  | $ | 351,306 |  | 8.00% |  | $ | 439,132 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 840,704 |  | 19.14% |  | $ | 263,479 |  | 6.00% |  | $ | 351,306 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 643,607 |  | 14.66% |  | $ | 197,609 |  | 4.50% |  | $ | 285,436 |  | 6.50%
Tier 1 capital to average total assets | $ | 840,704 |  | 13.69% |  | $ | 245,577 |  | 4.00% |  | $ | 306,971 |  | 5.00%
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 876,657 |  | 19.62% |  | $ | 357,404 |  | 8.00% |  | $ | 446,756 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 819,662 |  | 18.35% |  | $ | 268,053 |  | 6.00% |  | $ | 357,404 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 627,733 |  | 14.05% |  | $ | 201,040 |  | 4.50% |  | $ | 290,391 |  | 6.50%
Tier 1 capital to average total assets | $ | 819,662 |  | 12.99% |  | $ | 252,344 |  | 4.00% |  | $ | 315,430 |  | 5.00%
|  |  |  |  |  | Minimum Capital |  | Minimum to be Well
| Actual |  | Requirement |  | Capitalized
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
| (Dollars in thousands)
Bank Ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 887,024 |  | 20.20% |  | $ | 351,244 |  | 8.00% |  | $ | 439,055 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 831,012 |  | 18.93% |  | $ | 263,433 |  | 6.00% |  | $ | 351,244 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 831,012 |  | 18.93% |  | $ | 197,575 |  | 4.50% |  | $ | 285,386 |  | 6.50%
Tier 1 capital to average total assets | $ | 831,012 |  | 13.59% |  | $ | 244,618 |  | 4.00% |  | $ | 305,773 |  | 5.00%
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital to risk-weighted assets | $ | 857,259 |  | 19.23% |  | $ | 356,596 |  | 8.00% |  | $ | 445,745 |  | 10.00%
Tier 1 capital to risk-weighted assets | $ | 800,544 |  | 17.96% |  | $ | 267,447 |  | 6.00% |  | $ | 356,596 |  | 8.00%
Common equity tier 1 capital to risk-weighted assets | $ | 800,544 |  | 17.96% |  | $ | 200,585 |  | 4.50% |  | $ | 289,734 |  | 6.50%
Tier 1 capital to average total assets | $ | 800,544 |  | 12.75% |  | $ | 251,200 |  | 4.00% |  | $ | 314,000 |  | 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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