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Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2025
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |  |
Summary of Regulatory Capital Requirement | Management believes, as of September 30, 2025, that Pinnacle Financial and Pinnacle Bank met all capital adequacy requirements to which they are subject. To be categorized as well-capitalized under applicable banking regulations, Pinnacle Bank must maintain certain total risk-based, Tier 1 risk-based, common equity Tier 1 and Tier 1 leverage ratios as set forth in the following table and not be subject to a written agreement, order or directive to maintain a higher capital level. The capital conservation buffer is not included in the required ratios of the table presented below. Pinnacle Financial's and Pinnacle Bank's actual capital amounts and resulting ratios, not including the applicable 2.5% capital conservation buffer, are presented in the following table (in thousands):
| Actual |  | Minimum Capital Requirement |  | Minimum To Be Well-Capitalized (1)
| Amount | Ratio |  | Amount | Ratio |  | Amount | Ratio
At September 30, 2025 |  |  |  |  |  |  |  |
Total capital to risk weighted assets: |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 5,898,518 |  | 12.9 | % |  | $ | 3,645,705 |  | 8.0 | % |  | $ | 4,557,131 |  | 10.0 | %
Pinnacle Bank | $ | 5,684,596 |  | 12.5 | % |  | $ | 3,640,273 |  | 8.0 | % |  | $ | 4,550,341 |  | 10.0 | %
Tier 1 capital to risk weighted assets: |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 5,150,632 |  | 11.3 | % |  | $ | 2,734,278 |  | 6.0 | % |  | $ | 2,734,278 |  | 6.0 | %
Pinnacle Bank | $ | 5,245,710 |  | 11.5 | % |  | $ | 2,730,205 |  | 6.0 | % |  | $ | 3,640,273 |  | 8.0 | %
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 4,933,383 |  | 10.8 | % |  | $ | 2,050,709 |  | 4.5 | % |  | N/A | N/A
Pinnacle Bank | $ | 5,245,588 |  | 11.5 | % |  | $ | 2,047,653 |  | 4.5 | % |  | $ | 2,957,722 |  | 6.5 | %
Tier 1 capital to average assets (*): |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 5,150,632 |  | 9.6 | % |  | $ | 2,152,066 |  | 4.0 | % |  | N/A | N/A
Pinnacle Bank | $ | 5,245,710 |  | 9.8 | % |  | $ | 2,148,674 |  | 4.0 | % |  | $ | 2,685,842 |  | 5.0 | %
At December 31, 2024 |  |  |  |  |  |  |  |
Total capital to risk weighted assets: |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 5,515,492 |  | 13.1 | % |  | $ | 3,358,116 |  | 8.0 | % |  | $ | 4,197,645 |  | 10.0 | %
Pinnacle Bank | $ | 5,246,472 |  | 12.5 | % |  | $ | 3,352,352 |  | 8.0 | % |  | $ | 4,190,440 |  | 10.0 | %
Tier 1 capital to risk weighted assets: |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 4,751,357 |  | 11.3 | % |  | $ | 2,518,587 |  | 6.0 | % |  | $ | 2,518,587 |  | 6.0 | %
Pinnacle Bank | $ | 4,851,336 |  | 11.6 | % |  | $ | 2,514,264 |  | 6.0 | % |  | $ | 3,352,352 |  | 8.0 | %
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 4,534,108 |  | 10.8 | % |  | $ | 1,888,940 |  | 4.5 | % |  | N/A | N/A
Pinnacle Bank | $ | 4,851,213 |  | 11.6 | % |  | $ | 1,885,698 |  | 4.5 | % |  | $ | 2,723,786 |  | 6.5 | %
Tier 1 capital to average assets (*): |  |  |  |  |  |  |  |
Pinnacle Financial | $ | 4,751,357 |  | 9.6 | % |  | $ | 1,989,495 |  | 4.0 | % |  | N/A | N/A
Pinnacle Bank | $ | 4,851,336 |  | 9.8 | % |  | $ | 1,984,252 |  | 4.0 | % |  | $ | 2,480,315 |  | 5.0 | %
(1) Well-capitalized minimum Common equity Tier 1 capital to risk weighted assets and Tier 1 capital to average assets are not formally defined under applicable banking regulations for bank holding companies. (*) Average assets for the above calculations were based on the most recent quarter. | [1]
[1] | Well-capitalized minimum Common equity Tier 1 capital to risk weighted assets and Tier 1 capital to average assets are not formally defined under applicable banking regulations for bank holding companies.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(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 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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