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v3.25.3

Derivatives and Hedging Activities - Additional Information (Detail) bbl in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) Derivative | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Derivative bbl | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) Derivative | Jan. 31, 2025 USD ($) Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Termination value of derivatives in net liability position | $ 4,400,000 |  | $ 4,400,000 |  |  |
Collateral posted for derivative instruments | $ 4,400,000 |  | $ 4,400,000 |  |  |
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Interest rate hedging exposure to variability in future cash flows for forecasted transactions, maximum period |  |  | 11 years |  |  |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Unrealized gain on terminated fair value hedges in AOCI |  |  | $ 47,600,000 |  | $ 50,400,000 |
Number of interest rate swaps | Derivative | 0 |  | 0 |  | 0 |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Increase To Interest Income [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Fair value hedges reclassification from AOCI to interest | $ 1,300,000 | $ 1,200,000 | $ 3,700,000 | $ 4,900,000 |  |
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 51,500,000 |  | $ 51,500,000 |  | $ 51,500,000 |
Number of interest rate swaps | Derivative | 2 |  | 2 |  | 2 |
Reclassification from AOCI to interest | $ 600,000 |  | $ 600,000 |  |  |
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 11,600,000,000 |  | $ 11,600,000,000 |  | $ 5,500,000,000 |
Number of interest rate swaps | Derivative | 834 |  | 834 |  | 298 |
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member] | Heartland Financial USA, Inc [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 4,200,000,000
Number of interest rate swaps | Derivative |  |  |  |  |  | 478
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 3,000,000,000 |  | $ 3,000,000,000 |  | $ 3,000,000,000 |
Reclassification from AOCI to interest | $ 1,800,000 |  | $ 1,800,000 |  |  |
Commodity Derivatives [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative number of commodity swaps and option contracts | Derivative | 14 |  | 14 |  |  |
Commodity Derivatives [Member] | Derivatives not Designated as Hedging Instruments [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Aggregate remaining volume | bbl |  |  | 2.1 |  |  |

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- Definition Interest rate fair value hedge gain (loss) reclassified from accumulated accumulated other comprehensive income into interest income during period. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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- Definition Maximum period of hedging exposure to variability in future cash flows for forecasted transaction of interest rate cash flow hedge, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transaction for payment of variable interest on existing financial instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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