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v3.26.1

Loans and Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2025 USD ($) | Mar. 31, 2026 USD ($) Loan | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) Loan | Dec. 31, 2025 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Proceeds from sales of loans held for sale |  | $ 27,232,000 |  |  | $ 16,389,000 |
Nonaccrual Loans |  | 151,250,000 |  |  |  | $ 144,666,000
Restructured loans |  | 163,000 |  |  |  | 169,000
Total Past Due |  | 40,134,325,000 |  |  |  | 38,779,408,000
Non accrual loans with no related allowance for credit losses |  | 76,877,000 |  |  |  | 76,789,000
Accrued interest on loans |  | $ 180,100,000 |  |  |  | 176,100,000
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 |
Loan modifications made to borrowers experiencing financial difficulty | Loan |  | 0 |  |  | 0 |
PCD ACL at acquisition | $ 85,299,000 |  |  |  | $ 62,126,000 |
Heartland Financial USA Inc [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
PCD ACL at acquisition |  | $ 62,100,000 | $ 8,000,000 | $ 15,200,000 |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Proceeds from sales of loans held for sale |  | $ 27,200,000 |  |  | $ 16,400,000 |
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Number of Contracts | Loan |  | 3 |  |  | 1 |
Pre-modification loan balance |  | $ 534,000 |  |  | $ 225,000 |
Post-modification loan balance |  | $ 538,000 |  |  | $ 225,000 |
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 |  | $ 14,924,000 |  |  |  | $ 18,403,000

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