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Loans and Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) Loan | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) Loan | Sep. 30, 2025 USD ($) Loan | Sep. 30, 2024 USD ($) Loan | Dec. 31, 2024 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Loan portfolio purchases included in credit card receivables |  |  |  |  | $ 109,400,000 |  |
Proceeds from sales of loans held for sale |  |  |  |  | 75,312,000 | $ 60,779,000 |
Nonaccrual Loans |  | $ 131,965,000 |  |  | 131,965,000 |  | $ 19,282,000
Restructured loans |  | 177,000 |  |  | 177,000 |  | 196,000
Total Past Due |  | 37,706,507,000 |  |  | 37,706,507,000 |  | 25,642,301,000
Non accrual loans with no related allowance for credit losses |  | 62,453,000 |  |  | 62,453,000 |  | 19,282,000
Accrued interest on loans |  | 178,200,000 |  |  | $ 178,200,000 |  | 125,700,000
Credit card payments delinquency period beyond which payments considered significantly delinquent |  |  |  |  | 60 days |  |
Number of reasonable and supportable forecast period |  |  |  |  | 1 year |  |
Modifications made to borrowers experiencing financial difficulty commitment to lend |  | $ 0 |  | $ 0 | $ 0 | $ 0 |
Loan modifications made to borrowers experiencing financial difficulty | Loan |  | 0 |  | 0 | 0 | 0 |
PCD ACL at acquisition | $ 85,299,000 | $ 8,006,000 |  |  | $ 85,299,000 |  |
Heartland Financial USA Inc [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Fair value of loans acquired net of allowance for credit losses | $ 9,700,000,000 |  |  |  |  |  |
PCD ACL at acquisition |  | $ 8,000,000 | $ 15,200,000 |  | 62,100,000 |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Proceeds from sales of loans held for sale |  |  |  |  | $ 75,300,000 | $ 60,800,000 |
Residential Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Number of Contracts | Loan |  | 1 |  | 0 | 3 | 2 |
Pre-modification loan balance |  | $ 401,000 |  |  | $ 757,000 | $ 291,000 |
Post-modification loan balance |  | 432,000 |  |  | $ 790,000 | $ 293,000 |
Minimum [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Number of reasonable and supportable forecast period |  |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Number of reasonable and supportable forecast period |  |  |  |  | 3 years |  |
Greater than 90 days Past Due and Accruing [Member] |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |
Total Past Due |  | $ 6,131,000 |  |  | $ 6,131,000 |  | $ 7,602,000

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