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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 146,438 |
Minimum Required for Capital Adequacy Purposes | $ 64,227 |
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 10.26% |
Minimum Required for Capital Adequacy Purposes (as a percent) | 4.50% |
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 219,255 | $ 240,566
Minimum Required for Capital Adequacy Purposes | $ 114,195 | $ 108,853
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 15.36% | 17.68%
Minimum Required for Capital Adequacy Purposes (as a percent) | 8.00% | 8.00%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 170,697 | $ 196,499
Minimum Required for Capital Adequacy Purposes | $ 85,634 | $ 54,432
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 11.96% | 14.44%
Minimum Required for Capital Adequacy Purposes (as a percent) | 6.00% | 4.00%
Tier 1 capital to average assets, Amount |  |
Actual | $ 170,697 | $ 196,499
Minimum Required for Capital Adequacy Purposes | $ 80,708 | $ 79,154
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 8.46% | 9.93%
Minimum Required for Capital Adequacy Purposes (as a percent) | 4.00% | 4.00%
Old Second National Bank |  |
Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 227,335 |
Minimum Required for Capital Adequacy Purposes | 64,179 |
Minimum Required to Be Well Capitalized | $ 92,702 |
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 15.94% |
Minimum Required for Capital Adequacy Purposes (as a percent) | 4.50% |
Minimum Required to Be Well Capitalized (as a percent) | 6.50% |
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 243,942 | $ 254,897
Minimum Required for Capital Adequacy Purposes | 114,125 | 108,872
Minimum Required to Be Well Capitalized | $ 142,656 | $ 136,090
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 17.10% | 18.73%
Minimum Required for Capital Adequacy Purposes (as a percent) | 8.00% | 8.00%
Minimum Required to Be Well Capitalized (as a percent) | 10.00% | 10.00%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 227,335 | $ 237,828
Minimum Required for Capital Adequacy Purposes | 85,572 | 54,454
Minimum Required to Be Well Capitalized | $ 114,095 | $ 81,681
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 15.94% | 17.47%
Minimum Required for Capital Adequacy Purposes (as a percent) | 6.00% | 4.00%
Minimum Required to Be Well Capitalized (as a percent) | 8.00% | 6.00%
Tier 1 capital to average assets, Amount |  |
Actual | $ 227,335 | $ 237,828
Minimum Required for Capital Adequacy Purposes | 80,758 | 79,144
Minimum Required to Be Well Capitalized | $ 100,948 | $ 98,930
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 11.26% | 12.02%
Minimum Required for Capital Adequacy Purposes (as a percent) | 4.00% | 4.00%
Minimum Required to Be Well Capitalized (as a percent) | 5.00% | 5.00%

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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://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 2: 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 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 + Details
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