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v3.26.1

Borrowed Funds - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2025 USD ($) | Sep. 30, 2022 USD ($) | Mar. 31, 2026 USD ($) LettersOfCredit | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Retired subordinated notes |  |  |  | $ 11,055,000 |
Long-term debt |  |  | $ 477,164,000 |  | $ 474,229,000
FHLB Stock owned |  |  | 10,300,000 |  | 10,300,000
Federal Home Loan Bank [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term borrowing outstanding |  |  | 0 |  | 0
Letter of Credit [Member] | Federal Home Loan Bank [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit |  |  | $ 210,000,000 |  |
Letter of credit, expiration date |  |  | Aug. 31, 2026 |  |
Remaining borrowing capacity |  |  | $ 2,300,000,000 |  |
Number of letters of credit outstanding | LettersOfCredit |  |  | 4 |  |
Subordinated notes 6.25%, net of issuance costs [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated notes, issued |  | $ 110,000,000 |  |  |
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 |  |  | $ 600,000 |  | 700,000
Trust Preferred Securities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt obligations aggregate contractual balance |  |  | 262,900,000 |  | 262,900,000
Long-term debt |  |  | $ 221,176,000 |  | $ 220,034,000
Heartland Financial USA Inc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 278,018,000 |  |  |  |
Heartland Financial USA Inc [Member] | Subordinated notes 2.75% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated notes, issued | 150,000,000 |  |  |  |
Fair value of subordinated notes | $ 138,800,000 |  |  |  |
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. |  |

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