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Subordinated Debentures - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2006 | Oct. 31, 2004 | Jun. 30, 2004 | Mar. 30, 2004 | Jun. 30, 2003 | Dec. 31, 2017 | Dec. 31, 2016
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  |  |  | 2.75% |
LIBOR period |  |  |  |  |  | 3 months |
Junior subordinated debentures maturity date |  |  |  |  |  | Jul. 13, 2019 |
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  | $ 37,653,000 | $ 37,456,000
Horizon Statutory Trust Two [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  | $ 10,300,000 |  |  |  |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 1.95% |
Junior subordinated debentures and the securities variable rate |  | 1.95% |  |  |  |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 3.64% |
Junior subordinated debentures maturity date |  |  |  |  |  | Oct. 21, 2034 |
Cost of issuance of the securities |  | $ 17,500 |  |  |  |  |
First call date of the securities |  |  |  |  |  | Oct. 31, 2009 |
Horizon Bancorp Capital Trust Three [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold | $ 12,400,000 |  |  |  |  |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 1.65% |
Junior subordinated debentures and the securities variable rate | 1.65% |  |  |  |  |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 3.34% |
Junior subordinated debentures maturity date |  |  |  |  |  | Jan. 30, 2037 |
Cost of issuance of the securities | $ 12,647 |  |  |  |  |  |
Alliance Financial Statutory Trust One [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  | $ 5,200,000 |  |  |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 2.65% |
Junior subordinated debentures and the securities variable rate |  |  | 2.65% |  |  |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 4.34% |
Junior subordinated debentures maturity date |  |  |  |  |  | Jun. 01, 2034 |
Am Tru Statutory Trust One [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  | $ 3,500,000 |  |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 2.85% |
Junior subordinated debentures and the securities variable rate |  |  |  | 2.85% |  |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 4.54% |
Junior subordinated debentures maturity date |  |  |  |  |  | Mar. 01, 2034 |
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  | $ 3,300,000 |
Heartland Statutory Trust Two [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold | $ 3,000,000 |  |  |  |  |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 1.67% |
Junior subordinated debentures and the securities variable rate | 1.67% |  |  |  |  |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 3.36% |
Junior subordinated debentures maturity date |  |  |  |  |  | Dec. 01, 2036 |
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  | $ 1,800,000 |
City Savings Trust [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  | $ 5,000,000 |  |
Securities bearing interest rate |  |  |  |  |  | 90-day LIBOR plus 3.10% |
Junior subordinated debentures and the securities variable rate |  |  |  |  | 3.10% |  |
LIBOR period |  |  |  |  |  | 90 days |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  | 4.79% |
Junior subordinated debentures maturity date |  |  |  |  |  | Jun. 01, 2033 |
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  | $ 4,400,000 |

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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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 + Details
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