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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Banking and Thrift [Abstract] |
Schedule of Actual Amounts and Ratios | The Company’s and the Bank’s actual capital amounts and ratios are presented in the table below:
| Actual |  | Required For Capital Adequacy Purposes |  | Minimum Capital Adequacy With Capital Conservation Buffer |  | Required To Be Well Capitalized under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
| (Dollars in thousands)
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity tier 1 capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,458,344 |  |  | 11.44 | % |  | $ | 573,723 |  |  | 4.50 | % |  | $ | 812,774 |  |  | 6.375 | % |  | N/A |  |  | N/A |
Bank | $ | 1,737,092 |  |  | 13.63 | % |  | $ | 573,699 |  |  | 4.50 | % |  | $ | 812,740 |  |  | 6.375 | % |  | $ | 828,677 |  |  | 6.50 | %
Total capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,649,664 |  |  | 12.94 | % |  | $ | 1,019,952 |  |  | 8.00 | % |  | $ | 1,259,004 |  |  | 9.875 | % |  | N/A |  |  | N/A |
Bank | $ | 1,830,385 |  |  | 14.36 | % |  | $ | 1,019,910 |  |  | 8.00 | % |  | $ | 1,258,951 |  |  | 9.875 | % |  | $ | 1,274,887 |  |  | 10.00 | %
Tier I capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,556,371 |  |  | 12.21 | % |  | $ | 764,964 |  |  | 6.00 | % |  | $ | 1,004,015 |  |  | 7.875 | % |  | N/A |  |  | N/A |
Bank | $ | 1,737,092 |  |  | 13.63 | % |  | $ | 764,932 |  |  | 6.00 | % |  | $ | 812,740 |  |  | 7.875 | % |  | $ | 1,019,910 |  |  | 8.00 | %
Tier I capital (to average assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,556,371 |  |  | 10.55 | % |  | $ | 590,176 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Bank | $ | 1,737,092 |  |  | 11.76 | % |  | $ | 590,639 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | $ | 738,299 |  |  | 5.00 | %
| Actual |  | Required For Capital Adequacy Purposes |  | Minimum Capital Adequacy With Capital Conservation Buffer |  | Required To Be Well Capitalized under Prompt Corrective Action Provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
| (Dollars in thousands)
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity tier 1 capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,471,193 |  |  | 12.30 | % |  | $ | 538,435 |  |  | 4.50 | % |  | $ | 688,000 |  |  | 5.75 | % |  | N/A |  |  | N/A |
Bank | $ | 1,548,401 |  |  | 12.95 | % |  | $ | 538,178 |  |  | 4.50 | % |  | $ | 687,672 |  |  | 5.75 | % |  | $ | 777,368 |  |  | 6.50 | %
Total capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,653,521 |  |  | 13.82 | % |  | $ | 957,217 |  |  | 8.00 | % |  | $ | 1,106,782 |  |  | 9.25 | % |  | N/A |  |  | N/A |
Bank | $ | 1,633,778 |  |  | 13.66 | % |  | $ | 956,761 |  |  | 8.00 | % |  | $ | 1,106,255 |  |  | 9.25 | % |  | $ | 1,195,951 |  |  | 10.00 | %
Tier I capital (to risk-weighted assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,568,144 |  |  | 13.11 | % |  | $ | 717,913 |  |  | 6.00 | % |  | $ | 867,478 |  |  | 7.25 | % |  | N/A |  |  | N/A |
Bank | $ | 1,548,401 |  |  | 12.95 | % |  | $ | 717,571 |  |  | 6.00 | % |  | $ | 687,672 |  |  | 7.25 | % |  | $ | 956,761 |  |  | 8.00 | %
Tier I capital (to average assets): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company | $ | 1,568,144 |  |  | 11.54 | % |  | $ | 543,528 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Bank | $ | 1,548,401 |  |  | 11.40 | % |  | $ | 543,441 |  |  | 4.00 | % |  | N/A |  |  | N/A |  |  | $ | 679,301 |  |  | 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=84167132&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=84167132&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=84167132&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=84167132&loc=SL5958577-112826 + Details
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