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Regulatory Matters (Tables) | 3 Months Ended
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Mar. 31, 2017
Banking and Thrift [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations |
| Actual |  | Required For Capital Adequacy Purposes |  | Minimum Capital Adequacy With Capital Buffer |  | Required To Be Well Capitalized Under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
| (Dollars in thousands)
As of March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity tier 1 capital (to risk weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,413,592 |  |  | 12.22 | % |  | $ | 520,711 |  |  | 4.50 | % |  | $ | 665,353 |  |  | 5.75 | % |  | N/A |  |  | N/A |
Bank | $ | 1,489,239 |  |  | 12.88 | % |  | $ | 520,425 |  |  | 4.50 | % |  | $ | 664,987 |  |  | 5.75 | % |  | $ | 751,724 |  |  | 6.50 | %
Total capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,591,852 |  |  | 13.76 | % |  | $ | 925,708 |  |  | 8.00 | % |  | $ | 1,070,350 |  |  | 9.25 | % |  | N/A |  |  | N/A |
Bank | $ | 1,571,333 |  |  | 13.59 | % |  | $ | 925,199 |  |  | 8.00 | % |  | $ | 1,069,762 |  |  | 9.25 | % |  | $ | 1,156,499 |  |  | 10.00 | %
Tier I capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,509,758 |  |  | 13.05 | % |  | $ | 694,281 |  |  | 6.00 | % |  | $ | 838,923 |  |  | 7.25 | % |  | N/A |  |  | N/A |
Bank | $ | 1,489,239 |  |  | 12.88 | % |  | $ | 693,899 |  |  | 6.00 | % |  | $ | 838,462 |  |  | 7.25 | % |  | $ | 925,199 |  |  | 8.00 | %
Tier I capital (to average assets): |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,509,758 |  |  | 11.72 | % |  | $ | 515,352 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Bank | $ | 1,489,239 |  |  | 11.56 | % |  | $ | 515,212 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | $ | 644,014 |  |  | 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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