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Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements | Following is an analysis of capital ratios under Basel III guidelines for BancShares and FCB as of December 31, 2017 and 2016:
| December 31, 2017 |  | December 31, 2016
(Dollars in thousands) | Amount |  | Ratio |  | Requirements to be well-capitalized |  | Amount |  | Ratio |  | Requirements to be well-capitalized
BancShares |  |  |  |  |  |  |  |  |  |  |
Tier 1 risk-based capital | $ | 3,287,364 |  |  | 12.88 | % |  | 8.00 | % |  | $ | 2,995,557 |  |  | 12.42 | % |  | 8.00 | %
Common equity Tier 1 | 3,287,364 |  |  | 12.88 |  |  | 6.50 |  |  | 2,995,557 |  |  | 12.42 |  |  | 6.50 |
Total risk-based capital | 3,626,789 |  |  | 14.21 |  |  | 10.00 |  |  | 3,339,986 |  |  | 13.85 |  |  | 10.00 |
Leverage capital | 3,287,364 |  |  | 9.47 |  |  | 5.00 |  |  | 2,995,557 |  |  | 9.05 |  |  | 5.00 |
FCB |  |  |  |  |  |  |  |  |  |  |
Tier 1 risk-based capital | 3,189,709 |  |  | 12.54 |  |  | 8.00 |  |  | 2,942,829 |  |  | 12.25 |  |  | 8.00 |
Common equity Tier 1 | 3,189,709 |  |  | 12.54 |  |  | 6.50 |  |  | 2,942,829 |  |  | 12.25 |  |  | 6.50 |
Total risk-based capital | 3,422,634 |  |  | 13.46 |  |  | 10.00 |  |  | 3,172,757 |  |  | 13.21 |  |  | 10.00 |
Leverage capital | 3,189,709 |  |  | 9.22 |  |  | 5.00 |  |  | 2,942,829 |  |  | 8.94 |  |  | 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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