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Regulatory Capital Requirements | 12 Months Ended
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Dec. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Regulatory Capital Requirements | Note 20—Regulatory Capital Requirements The Company and the Bank are subject to various regulatory capital requirements administered by their respective banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off‑balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of Common Equity Tier 1 capital ("CET1"), Tier 1 capital and total capital to risk‑weighted assets and of Tier 1 capital to average consolidated assets, as defined in the regulations. As of December 31, 2024, the most recent notification from the FDIC categorized the Bank as well‑capitalized under the framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s category. The required regulatory capital ratios are set forth in the following tables along with the minimum capital amounts required for the Company and the Bank and the minimum capital amount required for the Bank to be considered well capitalized. The Company’s and the Bank’s actual capital amounts and ratios as of December 31, 2024 and 2023 are also presented.
|  | Actual |  |  | Minimum Capital Required |  |  | Required to be Considered Well Capitalized |
2024 |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,242,391 |  |  |  | 14.74 | % |  | $ | 674,471 |  |  |  | 8.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 1,181,699 |  |  |  | 14.07 | % |  |  | 672,045 |  |  |  | 8.00 | % |  | $ | 840,056 |  |  |  | 10.00 | %
Tier 1 capital to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,073,042 |  |  |  | 12.73 | % |  | $ | 505,853 |  |  |  | 6.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 1,087,350 |  |  |  | 12.94 | % |  |  | 504,033 |  |  |  | 6.00 | % |  | $ | 672,045 |  |  |  | 8.00 | %
Common Equity Tier 1 (CET1) to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 986,042 |  |  |  | 11.70 | % |  | $ | 379,390 |  |  |  | 4.50 | % |  | N/A |  |  | N/A |
Bank |  |  | 1,087,350 |  |  |  | 12.94 | % |  |  | 378,025 |  |  |  | 4.50 | % |  | $ | 546,036 |  |  |  | 6.50 | %
Tier 1 capital to average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,073,042 |  |  |  | 11.74 | % |  | $ | 365,470 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 1,087,350 |  |  |  | 11.92 | % |  |  | 364,899 |  |  |  | 4.00 | % |  | $ | 456,124 |  |  |  | 5.00 | %
|  | Actual |  |  | Minimum Capital Required |  |  | Required to be Considered Well Capitalized |
2023 |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
Total capital to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,123,568 |  |  |  | 13.38 | % |  | $ | 671,576 |  |  |  | 8.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 1,085,915 |  |  |  | 12.97 | % |  |  | 669,904 |  |  |  | 8.00 | % |  | $ | 837,380 |  |  |  | 10.00 | %
Tier 1 capital to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 956,027 |  |  |  | 11.39 | % |  | $ | 503,682 |  |  |  | 6.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 993,375 |  |  |  | 11.86 | % |  |  | 502,428 |  |  |  | 6.00 | % |  | $ | 669,904 |  |  |  | 8.00 | %
Common Equity Tier 1 (CET1) to risk weighted assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 869,027 |  |  |  | 10.35 | % |  | $ | 377,762 |  |  |  | 4.50 | % |  | N/A |  |  | N/A |
Bank |  |  | 993,375 |  |  |  | 11.86 | % |  |  | 376,821 |  |  |  | 4.50 | % |  | $ | 544,297 |  |  |  | 6.50 | %
Tier 1 capital to average assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 956,027 |  |  |  | 10.86 | % |  | $ | 352,089 |  |  |  | 4.00 | % |  | N/A |  |  | N/A |
Bank |  |  | 993,375 |  |  |  | 11.30 | % |  |  | 351,735 |  |  |  | 4.00 | % |  | $ | 439,669 |  |  |  | 5.00 | %
Note 20—Regulatory Capital Requirements (continued) The ratios above reflect the Company’s election to opt into the regulators’ joint CECL transition provision, which allows the Company to phase in the capital impact of the adoption of CECL over the next three years beginning January 1, 2022. Accordingly, capital ratios reflect 75% of the CECL impact as of December 31, 2024, 50% as of December 31, 2023, and 25% as of December 31, 2022. As of January 1, 2025, the capital impact of the adoption of CECL is fully phased in. The Company and Byline Bank must maintain a capital conservation buffer consisting of CET1 capital greater than 2.5% of risk-weighted assets above the required minimum risk-based capital levels in order to avoid limitations on paying dividends, repurchasing shares, and paying discretionary bonuses. The Company and Byline Bank's capital ratios exceeded the minimum capital requirement, including the conservation buffers, by 7.20% and 8.44%, r espectively, as of December 31, 2024. Provisions of state and federal banking regulations may limit, by statute, the amount of dividends that may be paid to the Company by Byline Bank without prior approval of Byline Bank’s regulatory agencies. The Company is economically dependent on the cash dividends received from Byline Bank. These dividends represent the Company’s primary cash flow from operating activities used to service its obligations. For the years ended December 31, 2024 and 2023, the Company received $46.0 million and $35.0 million, respectively, in cash dividends from Byline Bank. These funds were primarily used to pay interest on the subordinated notes, subordinated debentures issued in connection with trust preferred securities, dividends on the Company’s common, and other corporate expenses.

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- Definition The entire disclosure for regulatory capital requirement for depository and lending institutions. Institutions include, but not are not limited to, finance company, insured depository institution, bank holding company, savings and loan association holding company, bank and savings institution not federally insured, mortgage company, foreign financial institution and credit union. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1D Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1F + Details
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