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v3.25.3

Borrowed Funds - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2025 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) LettersOfCredit | Dec. 31, 2024 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Retired subordinated notes |  |  |  |  | $ 200,000 |
Long-term debt |  |  |  |  | 471,331 | $ 385,292
FHLB Stock owned |  |  |  |  | $ 10,200 | 10,200
Federal Home Loan Bank [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of letters of credit outstanding | LettersOfCredit |  |  |  |  | 6 |
Letter of Credit [Member] | Federal Home Loan Bank [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letter of credit |  |  |  |  | $ 203,300 |
Letter of credit, expiration date |  |  |  |  | Oct. 31, 2025 |
Remaining borrowing capacity |  |  |  |  | $ 1,800,000 |
Subordinated notes 3.70%, net of issuance costs [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes, issued |  |  | $ 200,000 |  |  |
Debt instrument, interest rate |  |  | 3.70% |  |  |
Debt instrument, maturity date |  |  | Sep. 17, 2030 |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  | semi-annually |
Unamortized debt issuance costs |  |  |  |  |  | 300
Retired subordinated notes |  |  |  | $ 11,100 |  |
Subordinated notes 6.25%, net of issuance costs [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes, issued |  | $ 110,000 |  |  |  |
Debt instrument, interest rate |  | 6.25% |  |  |  |
Debt instrument, maturity date |  | Sep. 28, 2032 |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  | semi-annually |
Debt instrument, redemption, description |  |  |  |  | The Company may redeem the notes, in whole or in part, on September 28, 2027, or on any interest payment date thereafter. |
Debt instrument, redemption period, start date |  | Sep. 28, 2027 |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 900 | 1,200
Trust Preferred Securities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 218,929 | 76,782
Heartland Financial USA Inc [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 278,018 |  |  |  |  |
Heartland Financial USA Inc [Member] | Subordinated notes 2.75% [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes, issued | 150,000 |  |  |  |  |
Fair value of subordinated notes | $ 138,800 |  |  |  |  |
Debt instrument, interest rate | 2.75% |  |  |  |  |
Debt instrument, maturity date | Sep. 15, 2031 |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  | semi-annually |
Debt instrument, redemption, description |  |  |  |  | The Company may redeem the notes, in whole or in part, on September 15, 2026, or on any interest payment date thereafter. |
Marquette Capital Trust I, Marquette Capital Trust II, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 103,100
Long-term debt acquired at fair value |  |  |  |  |  | $ 76,800
Marquette Financial Companies And HTLF [Member] | Trust Preferred Securities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt obligations aggregate contractual balance |  |  |  |  | $ 262,900 |
Long-term debt |  |  |  |  | $ 218,900 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: 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/1943274/2147478777/944-210-S99-1 + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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