Organization, Consolidation and Presentation of Financial Statements (Policies)	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of Central Bancompany, Inc., and its subsidiaries. Central Bancompany owns all the outstanding capital stock of The Central Trust Bank, which is headquartered in Missouri. The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, all adjustments necessary to present fairly the financial position and the results of operations for the interim periods have been made. In addition, all significant intercompany accounts and transactions have been eliminated. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and revenues and expenses for the periods presented. Actual results could differ significantly from those estimates. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of results to be attained for the full year or any other interim period. The consolidated financial statements have been prepared in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission. Accordingly, the financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and should be read in conjunction with the Company's audited consolidated financial statements and notes for the year ended December 31, 2025 contained in the Company's 2025 Annual Report on Form 10-K. Management has evaluated subsequent events for potential recognition or disclosure.
Fair Value Measurements	Fair Value Hierarchy The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as AFS and trading securities are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as loans, loans held for sale, mortgage servicing rights, and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or market accounting or write-downs of individual assets. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value, which are in accordance with ASC 820. ASC 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: •Level 1 - inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. •Level 2 - inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds). •Level 3 - inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company's best information and assumptions that a market participant would consider. The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in Note 16, “Fair Value Disclosures” to the Company's 2025 Annual Report on Form 10-K. There have been no significant changes in these methodologies since then.
Segments	The Company's reportable segments are determined by its Chief Executive Officer, who is the designated Chief Operating Decision Maker (“CODM”). The company has strategically aligned its operations into the following three reportable segments: Consumer Banking, Commercial Banking, and Wealth Management (collectively, the Business Segments). These operating segments are strategic business units that offer different products and services and have different marketing strategies. To evaluate segment performance and inform resource allocation decisions, the CODM regularly reviews each segment’s revenues and net income compared to budget. This process allows the Company to (1) assess the profitability of a specific business segment by aligning relevant costs with revenue, and (2) evaluate each business segment in a way that reflects its economic impact on consolidated earnings. During the year ended December 31, 2025, the Company modified the structure of its internal organization to better align financial reporting with the way management evaluates performance and allocates resources. Previously, the Company reported two operating segments: Community Banking and Wealth Management. As a result of the organizational changes, management now reviews operating performance and makes resource allocation decisions based on three operating segments: Consumer, Commercial, and Wealth Management. This change represents a reconsideration of the Company’s operating and reportable segments in accordance with ASC 280, Segment Reporting. In accordance with ASC 280‑10‑50‑34, the Company has recast all prior‑period segment information presented for comparative purposes to reflect the new segment structure. The change affected the aggregation and presentation of certain revenues, expenses, and allocated corporate costs among the Company’s operating segments, but did not impact consolidated net income, total assets, shareholders’ equity, or cash flows for any periods presented. Consistent with the requirements of ASC 250‑10‑50‑1(a), the recast of prior periods has been applied retrospectively to all comparative periods presented herein, and the nature and reason for the change in segment presentation are disclosed. The change did not result from a change in accounting principle but rather from a change in the organizational structure that constitutes a change in the internal information regularly reviewed by the CODM. Management believes the new segment structure provides improved transparency into the distinct customer groups served by the Company and the economic characteristics of each segment. The Consumer Banking operating segment consists of various consumer loan and deposit products offered primarily through its 156 full-service branches. This segment also includes residential mortgage, installment lending and other consumer loan financing options, along with debit and credit card loan and fee businesses. The Commercial Banking operating segment includes full-service relationship banking solutions to businesses, agencies and community organizations including commercial, small business and government segments. Our business payment solutions include treasury management services, merchant and commercial bank card products. The Wealth Management operating segment provides a full range of “fee-only” wealth management solutions, including investment management, fiduciary services, financial, estate, and tax planning services to individuals, businesses, and foundations. Services are provided through Central Trust Company and Central Investment Advisors, both divisions of The Central Trust Bank. The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, cash, etc.) and funds provided (deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current interest rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments. The operating segments also include a number of allocations of income and expense from various support and overhead centers within the Company. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results. The segment activity, as shown above, includes both direct and allocated items. Amounts in the "Corporate / Other" column include activity not related to the segments, such as administrative functions, various support and overhead operating units of the Company. Corporate administrative functions such as Compliance, Accounting, Credit Administration, Human Resources, and our Central Technology Services team expenses are allocated to the segments with an offset in Corp/Other noninterest expense. Expenses for the parent company, the administrative and support functions within the markets not specific to a segment, regulatory expenses, director and shareholder costs, community outreach, and other similar expenses are not allocated to the segments. The Company's reportable segments are strategic lines of business that offer different products and services. They are managed separately because each line services a specific customer need, requiring different performance measurement analysis and marketing strategies. The performance measurement of the segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments' financial condition and results of operations if they were independent entities.

Organization, Consolidation and Presentation of Financial Statements (Policies)

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying consolidated financial statements include the accounts of Central Bancompany, Inc., and its subsidiaries. Central Bancompany owns all the outstanding capital stock of The Central Trust Bank, which is headquartered in Missouri. The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but in the opinion of management, all adjustments necessary to present fairly the financial position and the results of operations for the interim periods have been made. In addition, all significant intercompany accounts and transactions have been eliminated. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and revenues and expenses for the periods presented. Actual results could differ significantly from those estimates.

The results of operations for the three months ended March 31, 2026 are not necessarily indicative of results to be attained for the full year or any other interim period. The consolidated financial statements have been prepared in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q adopted by the Securities and Exchange Commission. Accordingly, the financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and should be read in conjunction with the Company's audited consolidated financial statements and notes for the year ended December 31, 2025 contained in the Company's 2025 Annual Report on Form 10-K. Management has evaluated subsequent events for potential recognition or disclosure.

Fair Value Measurements

Fair Value Hierarchy

The Company uses fair value measurements to record fair value adjustments to certain financial and nonfinancial assets and liabilities and to determine fair value disclosures. Various financial instruments such as AFS and trading securities are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets and liabilities on a nonrecurring basis, such as loans, loans held for sale, mortgage servicing rights, and certain other investment securities. These nonrecurring fair value adjustments typically involve lower of cost or market accounting or write-downs of individual assets.

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Depending on the nature of the asset or liability, the Company uses various valuation techniques and assumptions when estimating fair value, which are in accordance with ASC 820. ASC 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows:

•Level 1 - inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

•Level 2 - inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the assets or liabilities, either directly or indirectly (such as interest rates, yield curves, and prepayment speeds).

•Level 3 - inputs to the valuation methodology are unobservable and significant to the fair value. These may be internally developed, using the Company's best information and assumptions that a market participant would consider.

The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in Note 16, “Fair Value Disclosures” to the Company's 2025 Annual Report on Form 10-K. There have been no significant changes in these methodologies since then.

Segments

The Company's reportable segments are determined by its Chief Executive Officer, who is the designated Chief Operating Decision Maker (“CODM”). The company has strategically aligned its operations into the following three reportable segments: Consumer Banking, Commercial Banking, and Wealth Management (collectively, the Business Segments). These operating segments are strategic business units that offer different products and services and have different marketing strategies.

To evaluate segment performance and inform resource allocation decisions, the CODM regularly reviews each segment’s revenues and net income compared to budget. This process allows the Company to (1) assess the profitability of a specific business segment by aligning relevant costs with revenue, and (2) evaluate each business segment in a way that reflects its economic impact on consolidated earnings.

During the year ended December 31, 2025, the Company modified the structure of its internal organization to better align financial reporting with the way management evaluates performance and allocates resources. Previously, the Company reported two operating segments: Community Banking and Wealth Management. As a result of the organizational changes, management now reviews operating performance and makes resource allocation decisions based on three operating segments: Consumer, Commercial, and Wealth Management.

This change represents a reconsideration of the Company’s operating and reportable segments in accordance with ASC 280, Segment Reporting. In accordance with ASC 280‑10‑50‑34, the Company has recast all prior‑period segment information presented for comparative purposes to reflect the new segment structure. The change affected the aggregation and presentation of certain revenues, expenses, and allocated corporate costs among the Company’s operating segments, but did not impact consolidated net income, total assets, shareholders’ equity, or cash flows for any periods presented.

Consistent with the requirements of ASC 250‑10‑50‑1(a), the recast of prior periods has been applied retrospectively to all comparative periods presented herein, and the nature and reason for the change in segment presentation are disclosed. The change did not result from a change in accounting principle but rather from a change in the organizational structure that constitutes a change in the internal information regularly reviewed by the CODM.

Management believes the new segment structure provides improved transparency into the distinct customer groups served by the Company and the economic characteristics of each segment.

The Consumer Banking operating segment consists of various consumer loan and deposit products offered primarily through its 156 full-service branches. This segment also includes residential mortgage, installment lending and other consumer loan financing options, along with debit and credit card loan and fee businesses.

The Commercial Banking operating segment includes full-service relationship banking solutions to businesses, agencies and community organizations including commercial, small business and government segments. Our business payment solutions include treasury management services, merchant and commercial bank card products.

The Wealth Management operating segment provides a full range of “fee-only” wealth management solutions, including investment management, fiduciary services, financial, estate, and tax planning services to individuals, businesses, and foundations. Services are provided through Central Trust Company and Central Investment Advisors, both divisions of The Central Trust Bank.

The Company uses a funds transfer pricing method to value funds used (e.g., loans, fixed assets, cash, etc.) and funds provided (deposits, borrowings, and equity) by the business segments and their components. This process assigns a specific value to each new source or use of funds with a maturity, based on current interest rates, thus determining an interest spread at the time of the transaction. Non-maturity assets and liabilities are valued using weighted average pools. The funds transfer pricing process attempts to remove interest rate risk from valuation, allowing management to compare profitability under various rate environments. The operating segments also include a number of allocations of income and expense from various support and overhead centers within the Company. Management periodically makes changes to methods of assigning costs and income to its business segments to better reflect operating results.

The segment activity, as shown above, includes both direct and allocated items. Amounts in the "Corporate / Other" column include activity not related to the segments, such as administrative functions, various support and overhead

operating units of the Company. Corporate administrative functions such as Compliance, Accounting, Credit Administration, Human Resources, and our Central Technology Services team expenses are allocated to the segments with an offset in Corp/Other noninterest expense. Expenses for the parent company, the administrative and support functions within the markets not specific to a segment, regulatory expenses, director and shareholder costs, community outreach, and other similar expenses are not allocated to the segments.

The Company's reportable segments are strategic lines of business that offer different products and services. They are managed separately because each line services a specific customer need, requiring different performance measurement analysis and marketing strategies. The performance measurement of the segments is based on the management structure of the Company and is not necessarily comparable with similar information for any other financial institution. The information is also not necessarily indicative of the segments' financial condition and results of operations if they were independent entities.