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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
Regulatory Matters [Abstract] |
Summary of State Bank's actual capital amounts and ratios |
|  | Actual |  |  | For Capital Adequacy Purposes |  |  | To Be Well Capitalized Under Prompt Corrective Action Procedures |
($ in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital to average assets |  | $ | 83,807 |  |  |  | 9.72 | % |  | $ | 34,477 |  |  |  | 4.0 | % |  | $ | 43,097 |  |  |  | 5.0 | %
Tier I Common equity capital to risk-weighted assets |  |  | 83,807 |  |  |  | 10.54 | % |  |  | 35,786 |  |  |  | 4.5 | % |  |  | 51,691 |  |  |  | 6.5 | %
Tier I Capital to risk-weighted assets |  |  | 83,807 |  |  |  | 10.54 | % |  |  | 47,715 |  |  |  | 6.0 | % |  |  | 63,620 |  |  |  | 8.0 | %
Total Risk-based capital to risk-weighted assets |  |  | 91,737 |  |  |  | 11.54 | % |  |  | 63,620 |  |  |  | 8.0 | % |  |  | 79,524 |  |  |  | 10.0 | %
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier I Capital to average assets |  | $ | 74,183 |  |  |  | 9.31 | % |  | $ | 31,875 |  |  |  | 4.0 | % |  | $ | 39,844 |  |  |  | 5.0 | %
Tier I Common equity capital to risk-weighted assets |  |  | 74,183 |  |  |  | 10.28 | % |  |  | 32,477 |  |  |  | 4.5 | % |  |  | 46,912 |  |  |  | 6.5 | %
Tier I Capital to risk-weighted assets |  |  | 74,183 |  |  |  | 10.28 | % |  |  | 43,303 |  |  |  | 6.0 | % |  |  | 57,738 |  |  |  | 8.0 | %
Total Risk-based capital to risk-weighted assets |  |  | 81,908 |  |  |  | 11.35 | % |  |  | 57,738 |  |  |  | 8.0 | % |  |  | 72,172 |  |  |  | 10.0 | %

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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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