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Regulatory & Capital Matters (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended |  | 0 Months Ended |  |  |  | 6 Months Ended |  |  |
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Apr. 21, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | May 15, 2014 Series B Stock | Apr. 28, 2014 Series B Stock | Apr. 15, 2014 Series B Stock | May 31, 2014 Series B Stock | Jun. 30, 2014 Series B Stock | Apr. 28, 2014 Series B Stock | Apr. 28, 2014 Series B Stock Large private investor | Apr. 28, 2014 Series B Stock Directors | Jun. 30, 2014 Bank of America credit facility, subordinated debt | Dec. 31, 2013 Bank of America credit facility, subordinated debt | Jun. 30, 2014 Junior subordinated debentures item | Jun. 30, 2014 Junior subordinated debentures Maximum item | Jun. 30, 2014 Old Second National Bank | Dec. 31, 2013 Old Second National Bank | Jun. 30, 2014 Old Second National Bank Minimum
Regulatory & Capital Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital leverage ratio, board-designated threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%
Total Capital Ratio, board-designated threshold (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00%
Tier One leverage ratio, basis point increase (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.31% |  |
Risk-based capital ratio, basis point increase (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |
Proceeds from issuance of common stock |  |  | $ 64,395,000 |  |  |  |  |  | $ 64,000,000 |  |  |  |  |  |  |  |  |  |
Total capital to risk weighted assets, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual at period end |  | 233,167,000 | 233,167,000 | 191,139,000 |  |  |  |  |  |  |  |  |  |  |  |  | 241,394,000 | 227,467,000 |
Minimum Required for Capital Adequacy Purposes |  | 105,625,000 | 105,625,000 | 100,865,000 |  |  |  |  |  |  |  |  |  |  |  |  | 105,585,000 | 100,872,000 |
Minimum Required to Be Well Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 131,981,000 | 126,090,000 |
Total capital to risk weighted assets, Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-based capital ratio (as a percent) |  | 17.66% | 17.66% | 15.16% |  |  |  |  |  |  |  |  |  |  |  |  | 18.29% | 18.04% |
Minimum Required for Capital Adequacy Purposes (as a percent) |  | 8.00% | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  | 189,576,000 | 189,576,000 | 134,199,000 |  |  |  |  |  |  |  |  |  |  |  |  | 224,812,000 | 211,568,000 |
Minimum Required for Capital Adequacy Purposes |  | 52,807,000 | 52,807,000 | 50,403,000 |  |  |  |  |  |  |  |  |  |  |  |  | 52,804,000 | 50,433,000 |
Minimum Required to Be Well Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,206,000 | 75,650,000 |
Tier 1 capital to risk weighted assets, Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual (as a percent) |  | 14.36% | 14.36% | 10.65% |  |  |  |  |  |  |  |  |  |  |  |  | 17.03% | 16.78% |
Minimum Required for Capital Adequacy Purposes (as a percent) |  | 4.00% | 4.00% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% |
Minimum Required to Be Well Capitalized (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |
Tier 1 capital to average assets, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual |  | 189,576,000 | 189,576,000 | 134,199,000 |  |  |  |  |  |  |  |  |  |  |  |  | 224,812,000 | 211,568,000 |
Minimum Required for Capital Adequacy Purposes |  | 79,738,000 | 79,738,000 | 77,126,000 |  |  |  |  |  |  |  |  |  |  |  |  | 79,721,000 | 77,144,000 |
Minimum Required to Be Well Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,651,000 | 96,430,000 |
Tier 1 capital to average assets, Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 capital leverage ratio (as a percent) |  | 9.51% | 9.51% | 6.96% |  |  |  |  |  |  |  |  |  |  |  |  | 11.28% | 10.97% |
Minimum Required for Capital Adequacy Purposes (as a percent) |  | 4.00% | 4.00% | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% |
Minimum Required to Be Well Capitalized (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |
Other regulatory capital information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated debt |  | 45,000,000 | 45,000,000 | 45,000,000 |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |  |  |
Debt obligation as a percent of Tier 2 regulatory capital |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% | 80.00% |  |  |  |  |
Trust preferred proceeds qualified as Tier 1 regulatory capital |  |  |  |  |  |  |  |  |  |  |  |  | 56,600,000 | 51,600,000 |  |  |  |  |
Trust preferred proceeds qualified as Tier 2 regulatory capital |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |
Dividend Restrictions and Deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of previous years retained profit considered for dividend payment |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated debenture |  | 58,378,000 | 58,378,000 | 58,378,000 |  |  |  |  |  |  |  |  |  |  | 58,400,000 |  |  |  |
Number of statutory business trusts that hold junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of quarterly periods for deferral of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Payments to indentured trustees | 19,700,000 | 19,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend amount |  |  |  |  |  |  | 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  | 10,258,000 |  | 10,300,000 |  |  | 10,300,000 |  |  |  |  |  |  |  |  |  |  |
Shares redeemed (in shares) |  |  |  |  |  | 25,669 |  |  | 25,669 |  |  |  |  |  |  |  |  |  |
Repurchase price percentage of liquidation value (as a percent) |  |  |  |  |  | 94.75% |  |  | 94.75% |  |  |  |  |  |  |  |  |  |
Preferred stock, Liquidation value (in dollars per share) |  | $ 1,000 | $ 1,000 | $ 1,000 |  |  |  |  |  | $ 947.50 |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 1,000 | $ 1,000 | $ 1,000 |  |  |  |  |  | $ 947.50 |  |  |  |  |  |  |  |  |
Payments for repurchase of preferred stock |  |  |  |  |  | 24,300,000 |  |  | 24,300,000 |  | 22,900,000 | 1,400,000 |  |  |  |  |  |  |
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption |  | $ 5,433,000 | $ 5,433,000 |  |  |  |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: 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=7881181&loc=d3e65071-112826 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=7881181&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 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=7881181&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: 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=7881181&loc=d3e65071-112826 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=7881181&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 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized 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=7881181&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in 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=7881181&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital divided by average assets as defined in the regulations. + References Reference 1: 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=7881181&loc=d3e65071-112826 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=7881181&loc=SL5958568-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: 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=7881181&loc=d3e65071-112826 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=7881181&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 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=7881181&loc=SL5958568-112826 + Details
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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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 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=7881181&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 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized 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=7881181&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" 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=7881181&loc=SL5958568-112826 + Details
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