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Regulatory Matters (Details) $ / shares in Units, shares in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 shares | Sep. 30, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Preceding period of retained earnings used in calculation of dividend payable |  |  |  | 2 years |
Retained earnings |  | $ 1,748,491,000 |  | $ 1,748,491,000 | $ 1,407,723,000
Quarterly common stock dividend (in dollar per share) | $ / shares |  | $ 0.18 |  | $ 0.18 | $ 0.16
Depositary Shares | shares |  |  | 9,000 |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares |  | $ 16.88 |  |  |
Preferred Stock, Dividend Per Depositary Share |  | $ 0.422 |  |  |
Pinnacle Financial |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Cash dividends paid to Pinnacle Financial by Pinnacle Bank |  |  |  | $ 66,500,000 |
Actual |  |  |  |  |
Total capital to risk weighted assets |  | 3,915,561,000 |  | 3,915,561,000 | $ 3,678,405,000
Tier I capital to risk weighted assets |  | 3,156,777,000 |  | 3,156,777,000 | 2,803,541,000
Common equity Tier 1 capital to risk weighted assets |  | 2,939,528,000 |  | 2,939,528,000 | 2,586,292,000
Tier I capital to average assets | [1] | $ 3,156,777,000 |  | $ 3,156,777,000 | $ 2,803,541,000
Actual |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.140 |  | 0.140 | 0.143
Tier I capital to risk weighted assets (as percent) |  | 0.113 |  | 0.113 | 0.109
Common equity Tier 1 capital to risk weighted assets |  | 0.105 |  | 0.105 | 0.100
Tier I capital to average assets (as percent) | [1] | 0.093 |  | 0.093 | 0.086
Minimum Capital Requirement |  |  |  |  |
Total capital to risk weighted assets |  | $ 2,235,652,000 |  | $ 2,235,652,000 | $ 2,063,352,000
Tier I capital to risk weighted assets |  | 1,676,739,000 |  | 1,676,739,000 | 1,547,514,000
Common equity Tier 1 capital to risk weighted assets |  | 1,257,554,000 |  | 1,257,554,000 | 1,160,635,000
Tier I capital to average assets | [1] | $ 1,355,712,000 |  | $ 1,355,712,000 | $ 1,298,756,000
Minimum Capital Requirement |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.080 |  | 0.080 | 0.080
Tier I capital to risk weighted assets (as percent) |  | 0.060 |  | 0.060 | 0.060
Common Equity Tier I capital to risk weighted assets (as percent) |  | 0.045 |  | 0.045 | 0.045
Tier I capital to average assets (as percent) | [1] | 0.040 |  | 0.040 | 0.040
Minimum To Be Well-Capitalized |  |  |  |  |
Total capital to risk weighted assets |  | $ 2,794,565,000 |  | $ 2,794,565,000 | $ 2,579,190,000
Tier I capital to risk weighted assets |  | $ 2,235,652,000 |  | $ 2,235,652,000 | $ 2,063,352,000
Minimum To Be Well-Capitalized |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.100 |  | 0.100 | 0.100
Tier I capital to risk weighted assets (as percent) |  | 0.080 |  | 0.080 | 0.080
Pinnacle Bank |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Retained earnings |  | $ 773,100,000 |  | $ 773,100,000 |
Actual |  |  |  |  |
Total capital to risk weighted assets |  | 3,466,596,000 |  | 3,466,596,000 | $ 3,259,538,000
Tier I capital to risk weighted assets |  | 3,256,812,000 |  | 3,256,812,000 | 2,933,674,000
Common equity Tier 1 capital to risk weighted assets |  | 3,256,689,000 |  | 3,256,689,000 | 2,933,551,000
Tier I capital to average assets | [1] | $ 3,256,812,000 |  | $ 3,256,812,000 | $ 2,933,674,000
Actual |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.125 |  | 0.125 | 0.127
Tier I capital to risk weighted assets (as percent) |  | 0.117 |  | 0.117 | 0.114
Common equity Tier 1 capital to risk weighted assets |  | 0.117 |  | 0.117 | 0.114
Tier I capital to average assets (as percent) | [1] | 0.096 |  | 0.096 | 0.091
Minimum Capital Requirement |  |  |  |  |
Total capital to risk weighted assets |  | $ 2,223,799,000 |  | $ 2,223,799,000 | $ 2,055,892,000
Tier I capital to risk weighted assets |  | 1,667,849,000 |  | 1,667,849,000 | 1,541,919,000
Common equity Tier 1 capital to risk weighted assets |  | 1,250,887,000 |  | 1,250,887,000 | 1,156,439,000
Tier I capital to average assets | [1] | $ 1,350,660,000 |  | $ 1,350,660,000 | $ 1,294,033,000
Minimum Capital Requirement |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.080 |  | 0.080 | 0.080
Tier I capital to risk weighted assets (as percent) |  | 0.060 |  | 0.060 | 0.060
Common Equity Tier I capital to risk weighted assets (as percent) |  | 0.045 |  | 0.045 | 0.045
Tier I capital to average assets (as percent) | [1] | 0.040 |  | 0.040 | 0.040
Minimum To Be Well-Capitalized |  |  |  |  |
Total capital to risk weighted assets |  | $ 2,779,749,000 |  | $ 2,779,749,000 | $ 2,569,865,000
Tier I capital to risk weighted assets |  | 2,223,799,000 |  | 2,223,799,000 | 2,055,892,000
Common equity Tier 1 capital to risk weighted assets |  | 1,806,837,000 |  | 1,806,837,000 | 1,670,412,000
Tier I capital to average assets | [1] | $ 1,688,325,000 |  | $ 1,688,325,000 | $ 1,617,541,000
Minimum To Be Well-Capitalized |  |  |  |  |
Total capital to risk weighted assets (as percent) |  | 0.100 |  | 0.100 | 0.100
Tier I capital to risk weighted assets (as percent) |  | 0.080 |  | 0.080 | 0.080
Common Equity Tier I capital to risk weighted assets (as percent) |  | 0.065 |  | 0.065 | 0.065
Tier I capital to average assets (as percent) | [1] | 0.050 |  | 0.050 | 0.050
[1] | (*) Average assets for the above calculations were based on the most recent quarter.

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- Definition Refers to maximum preceding period of retained earnings used in calculation of dividend payable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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