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Summary of Significant Accounting Policies | 3 Months Ended
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Mar. 31, 2026
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. These estimates and assumptions also impact reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. A summary of the significant accounting policies to assist the reader in understanding the financial presentation is provided in the Notes to Consolidated Financial Statements in the Form 10-K. Business Combinations The Company accounts for business combinations using the purchase method of accounting in accordance with FASB ASC Topic 805, Business Combinations, which requires assets acquired and liabilities assumed to be recognized at fair value as of the acquisition date. On January 31, 2025 (Acquisition Date), the Company acquired Heartland Financial USA, Inc. (HTLF) pursuant to an Agreement and Plan of Merger, dated as of April 28, 2024. See Note 13, “Acquisition” for additional information. Cash and cash equivalents Cash and cash equivalents includes Cash and due from banks and amounts due from the Federal Reserve Bank (FRB). Cash on hand, cash items in the process of collection, and amounts due from correspondent banks are included in Cash and due from banks. Amounts due from the FRB are interest-bearing for all periods presented and are included in the Interest-bearing due from banks line on the Company’s Consolidated Balance Sheets. This table provides a summary of cash and cash equivalents as presented on the Consolidated Statements of Cash Flows as of March 31, 2026 and March 31, 2025 (in thousands):
|  | March 31, |
|  | 2026 |  |  | 2025 |
Due from the FRB |  | $ | 5,525,511 |  |  | $ | 9,692,616 |
Cash and due from banks |  |  | 735,829 |  |  |  | 917,450 |
Cash and cash equivalents at end of period |  | $ | 6,261,340 |  |  | $ | 10,610,066 |
Also included in the Interest-bearing due from banks, but not considered cash and cash equivalents, are interest-bearing accounts held at other financial institutions, which totaled $129.8 m illion and $119.3 million at March 31, 2026 and March 31, 2025, respectively. Acquired Loans Acquired loans are initially recorded at fair value. The Company’s accounting methods for acquired loans depends on whether or not the loan reflects more than insignificant credit deterioration since origination at the date of acquisition. Non-Purchased Credit Deteriorated Loans Non-purchased credit deteriorated (Non-PCD) loans do not reflect more than insignificant credit deterioration since origination at the date of acquisition. These loans are recorded at fair value and an increase to the allowance for credit losses (ACL) is recorded with a corresponding increase to the provision for credit losses at the date of acquisition. The difference between fair value and the unpaid principal balance at the acquisition date is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Purchased Credit Deteriorated Loans Purchased loans that reflect a more than insignificant credit deterioration since origination at the date of acquisition are classified as purchased credit deteriorated (PCD) loans. PCD loans are recorded at fair value plus the ACL expected at the time of acquisition. Under this method, there is no provision for credit losses on acquisition of PCD loans. The non-credit-related difference between fair value and the unpaid principal balance at the acquisition date is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Per Share Data Basic net income per common share is computed using net income available to common shareholders and the weighted average number of shares of common stock outstanding during each period. Diluted net income per common share is determined using net income available to common shareholders and the weighted average common shares and assumed incremental common shares issued. The following table provides the amounts used in the determination of basic and diluted net income per common share for the three months ended March 31, 2026 and 2025 (in thousands, except share and per share data):
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Net income |  | $ | 261,438 |  |  | $ | 81,333 |
Less: Preferred dividends |  |  | 5,813 |  |  |  | 2,013 |
Net income available to common shareholders |  | $ | 255,625 |  |  | $ | 79,320 |
Weighted average common shares outstanding for basic earnings per share |  |  | 76,032,620 |  |  |  | 65,063,262 |
Assumed incremental common shares issued upon vesting of outstanding restricted stock units |  |  | 366,613 |  |  |  | 432,796 |
Weighted average common shares for diluted earnings per share |  |  | 76,399,233 |  |  |  | 65,496,058 |
Net income per common share – basic |  | $ | 3.36 |  |  | $ | 1.22 |
Net income per common share – diluted |  |  | 3.35 |  |  |  | 1.21 |
Number of antidilutive restricted stock units excluded from diluted earnings per share computation |  |  | 202,485 |  |  |  | — |
Number of antidilutive stock options excluded from diluted earnings per share computation |  |  | — |  |  |  | 4,962 |
Derivatives The Company records all derivatives on the Consolidated Balance Sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Currently, 15 of the Company’s derivatives are designated in qualifying hedging relationships. However, the remainder of the Company’s derivatives are not designated in qualifying hedging relationships, as the derivatives are not used to manage risks within the Company’s assets or liabilities. All changes in fair value of the Company’s non-designated derivatives and fair value hedges are recognized directly in earnings. Changes in fair value of the Company’s cash flow hedges are recognized in accumulated other comprehensive income (AOCI) and are reclassified to earnings when the hedged transaction affects earnings.

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/235/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-1 + Details
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