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Junior Subordinated Debentures Issued to Capital Trusts (Details) - USD ($) $ in Millions	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, 2023	Jun. 24, 2020
Subordinate Debenture [Line Items]
Junior subordinated debentures and the securities variable rate							5.49%
Interest rate on junior subordinated debentures and securities								5.625%
Salin
Subordinate Debenture [Line Items]
Trust preferred capital securities sold					$ 20.0
Junior subordinated debentures and the securities variable rate					3.21%
Interest rate on junior subordinated debentures and securities							8.54%
Subordinated notes							$ 18.2
Horizon Statutory Trust II
Subordinate Debenture [Line Items]
Trust preferred capital securities sold		$ 10.3
Junior subordinated debentures and the securities variable rate		2.21%
Interest rate on junior subordinated debentures and securities							7.59%
Horizon Bancorp Capital Trust III
Subordinate Debenture [Line Items]
Trust preferred capital securities sold	$ 12.4
Junior subordinated debentures and the securities variable rate	1.91%
Interest rate on junior subordinated debentures and securities							7.30%
Alliance Financial Statutory Trust I
Subordinate Debenture [Line Items]
Trust preferred capital securities sold			$ 5.2
Junior subordinated debentures and the securities variable rate			2.91%
Interest rate on junior subordinated debentures and securities							8.29%
Am Tru Statutory Trust I
Subordinate Debenture [Line Items]
Trust preferred capital securities sold				$ 3.5
Junior subordinated debentures and the securities variable rate				3.11%
Interest rate on junior subordinated debentures and securities							8.49%
Heartland Trust
Subordinate Debenture [Line Items]
Trust preferred capital securities sold	$ 3.0
Junior subordinated debentures and the securities variable rate	1.93%
Interest rate on junior subordinated debentures and securities							7.32%
Subordinated notes							$ 2.2
City Savings Trust
Subordinate Debenture [Line Items]
Trust preferred capital securities sold						$ 5.0
Junior subordinated debentures and the securities variable rate						3.36%
Interest rate on junior subordinated debentures and securities							8.72%
Subordinated notes							$ 4.6

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- Definition

Preferred capital securities sold by entity wholly owned trust.

+ References

No definition available.

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Subordinate Debenture [Line Items]

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
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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
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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