Junior Subordinated Debentures	12 Months Ended
Dec. 31, 2018
Junior Subordinated Debentures.
Junior Subordinated Debentures	Note 11: Junior Subordinated Debentures The Company completed the sale of $27.5 million of cumulative trust preferred securities by its unconsolidated subsidiary, Old Second Capital Trust I in June 2003. An additional $4.1 million of cumulative trust preferred securities were sold in July 2003. The costs associated with the issuance of the cumulative trust preferred securities are being amortized over 30 years. The trust preferred securities may remain outstanding for a 30‑year term but, subject to regulatory approval, can be called in whole or in part by the Company after June 30, 2008, and can be exercised by the Company from time to time thereafter. When not in deferral, distributions on the securities are payable quarterly at an annual rate of 7.80%. The Company issued a new $32.6 million subordinated debenture to Old Second Capital Trust I in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities. The Company sold an additional $25.0 million of cumulative trust preferred securities through a private placement completed by an additional, unconsolidated subsidiary, Old Second Capital Trust II, in April 2007. These trust preferred securities also mature in 30 years, but subject to the aforementioned regulatory approval, can be called in whole or in part on a quarterly basis commencing June 15, 2017. The quarterly cash distributions on the securities are fixed at 6.77% through June 15, 2017, and float at 150 basis points over three-month LIBOR thereafter. The Trust II issuance converted from fixed to float rate at three month LIBOR plus 150 basis points on June 16, 2017; as of December 31, 2018, the rate effective for the Trust II issuance was 4.37%. Upon conversion to a floating rate, a cash flow hedge was initiated which resulted in the total interest rate period on the debt of 4.30% as of December 31, 2017, compared to the rate paid prior to June 15, 2017 of 6.77%. The Company issued a new $25.8 million subordinated debenture to the Old Second Capital Trust II in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities. Both of the debentures issued by the Company are disclosed on the Consolidated Balance Sheet as junior subordinated debentures and the related interest expense for each issuance is included in the Consolidated Statements of Income. As of December 31, 2018 and 2017, unamortized debt issuance costs related to the junior subordinated debentures were $692,000 and $739,000 respectively, and are included as a reduction to the balance of the junior subordinated debentures on the Consolidated Balance Sheet. Under the terms of the subordinated debentures issued to each of Old Second Capital Trust I and II, the Company is allowed to defer payments of interest for 20 quarterly periods without default or penalty, but such amounts continue to accrue. Also during a deferral period, the Company generally may not pay cash dividends on or repurchase its common stock or preferred stock. As of December 31, 2018, the Company is current on the payments due on these securities.

Note 11: Junior Subordinated Debentures

The Company completed the sale of $27.5 million of cumulative trust preferred securities by its unconsolidated subsidiary, Old Second Capital Trust I in June 2003. An additional $4.1 million of cumulative trust preferred securities were sold in July 2003. The costs associated with the issuance of the cumulative trust preferred securities are being amortized over 30 years. The trust preferred securities may remain outstanding for a 30‑year term but, subject to regulatory approval, can be called in whole or in part by the Company after June 30, 2008, and can be exercised by the Company from time to time thereafter. When not in deferral, distributions on the securities are payable quarterly at an annual rate of 7.80%. The Company issued a new $32.6 million subordinated debenture to Old Second Capital Trust I in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities.

The Company sold an additional $25.0 million of cumulative trust preferred securities through a private placement completed by an additional, unconsolidated subsidiary, Old Second Capital Trust II, in April 2007. These trust preferred securities also mature in 30 years, but subject to the aforementioned regulatory approval, can be called in whole or in part on a quarterly basis commencing June 15, 2017. The quarterly cash distributions on the securities are fixed at 6.77% through June 15, 2017, and float at 150 basis points over three-month LIBOR thereafter. The Trust II issuance converted from fixed to float rate at three month LIBOR plus 150 basis points on June 16, 2017; as of December 31, 2018, the rate effective for the Trust II issuance was 4.37%. Upon conversion to a floating rate, a cash flow hedge was initiated which resulted in the total interest rate period on the debt of 4.30% as of December 31, 2017, compared to the rate paid prior to June 15, 2017 of 6.77%. The Company issued a new $25.8 million subordinated debenture to the Old Second Capital Trust II in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities. Both of the debentures issued by the Company are disclosed on the Consolidated Balance Sheet as junior subordinated debentures and the related interest expense for each issuance is included in the Consolidated Statements of Income. As of December 31, 2018 and 2017, unamortized debt issuance costs related to the junior subordinated debentures were $692,000 and $739,000 respectively, and are included as a reduction to the balance of the junior subordinated debentures on the Consolidated Balance Sheet.

Under the terms of the subordinated debentures issued to each of Old Second Capital Trust I and II, the Company is allowed to defer payments of interest for 20 quarterly periods without default or penalty, but such amounts continue to accrue. Also during a deferral period, the Company generally may not pay cash dividends on or repurchase its common stock or preferred stock. As of December 31, 2018, the Company is current on the payments due on these securities.