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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 | Oct. 31, 2003 | Jun. 30, 2003 | Dec. 31, 2019
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
LIBOR period |  |  |  |  |  |  | 3 months
Salin Bank Shares [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  | $ 20,000,000.0 |  |
Securities bearing interest rate |  |  |  |  |  |  | 90-day LIBOR plus 2.95%
Junior subordinated debentures and the securities variable rate |  |  |  |  | 2.95% |  |
LIBOR period |  |  |  |  |  |  | 90 days
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 4.86%
Junior subordinated debentures maturity date |  |  |  |  |  |  | Oct. 01, 2033
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  |  | $ 17,700,000
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 |  |  |  |  |  |  | 3.86%
Junior subordinated debentures maturity date |  |  |  |  |  |  | Nov. 23, 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 |  |  |  |  |  |  | 3.56%
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 |  |  |  |  |  |  | 4.56%
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 |  |  |  |  |  |  | 4.76%
Junior subordinated debentures maturity date |  |  |  |  |  |  | Dec. 01, 2033
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  |  | $ 3,500,000
Heartland Statutory Trust Two [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold | $ 3,000,000.0 |  |  |  |  |  |
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 |  |  |  |  |  |  | 3.58%
Junior subordinated debentures maturity date |  |  |  |  |  |  | Dec. 01, 2036
Carrying value of securities, net of remaining purchase discount |  |  |  |  |  |  | $ 1,900,000
City Savings Trust [Member] |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  |  | $ 5,000,000.0 |
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 |  |  |  |  |  |  | 5.01%
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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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