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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Summary of State Bank's actual capital amounts and ratios |  |
Tier I Capital to average assets, Actual, Amount | $ 110,022 | $ 83,807
Tier I Capital to average assets, Adequacy Purposes, Amount | 39,183 | 34,477
Tier I Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount | 48,979 | 43,097
Tier I Common equity capital to risk-weighted assets, Actual, Amount | 110,022 | 83,807
Tier I Common equity capital to risk-weighted assets, Adequacy Purposes, Amount | 39,386 | 35,786
Tier I Common equity capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount | 56,890 | 51,691
Tier I Capital to risk-weighted assets, Actual, Amount | 110,022 | 83,807
Tier I Capital to risk-weighted assets, Adequacy Purposes, Amount | 52,514 | 47,715
Tier I Capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount | 70,019 | 63,620
Total Risk-based capital to risk-weighted assets, Actual, Amount | 118,189 | 91,737
Total Risk-based capital to risk-weighted assets, Adequacy Purposes, Amount | 70,019 | 63,620
Total Risk-based capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Amount | $ 87,524 | $ 79,524
Tier I Capital to average assets, Actual, Ratio | 11.23% | 9.72%
Tier I Capital to average assets, Adequacy Purposes, Ratio | 4.00% | 4.00%
Tier I Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio | 5.00% | 5.00%
Tier I Common equity capital to risk-weighted assets, Actual, Ratio | 12.57% | 10.54%
Tier I Common equity capital to risk-weighted assets, Adequacy Purposes, Ratio | 4.50% | 4.50%
Tier I Common equity capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio | 6.50% | 6.50%
Tier I Capital to risk-weighted assets, Actual, Ratio | 12.57% | 10.54%
Tier I Capital to risk-weighted assets, Adequacy Purposes, Ratio | 6.00% | 6.00%
Tier I Capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio | 8.00% | 8.00%
Total Risk-based capital to risk-weighted assets, Actual, Ratio | 13.50% | 11.54%
Total Risk-based capital to risk-weighted assets, Adequacy Purposes, Ratio | 8.00% | 8.00%
Total Risk-based capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Procedures, Ratio | 10.00% | 10.00%

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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