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Regulatory Matters (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020
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 |  |  | $ 1,407,723,000 | $ 1,184,183,000 |  |
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries |  |  | $ 119,100,000 |  |  |
Dividends Payable, Amount Per Share |  |  | $ 0.18 |  |  | $ 0.16
Preferred Stock, Dividend Rate, Per-Dollar-Amount |  |  | $ 16.88 |  |  |
Preferred Stock, Dividend Per Depositary Share |  |  | $ 0.422 |  |  |
Depositary Shares |  | 9,000 |  |  |  |
Minimum To Be Well Capitalized - Ratios |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants |  |  | 217,126,000 | 0 | $ 0 |
Pinnacle Bank |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Retained earnings |  |  | 788,300,000 |  |  |
Actual Amount |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 3,259,538,000 | 2,906,853,000 |  |
Tier I capital to risk weighted assets: |  |  | 2,933,674,000 | 2,679,713,000 |  |
Common Equity Tier 1 capital to risk weighted assets: |  |  | 2,933,551,000 | 2,679,590,000 |  |
Tier I capital to average assets (*): | [1] |  | $ 2,933,674,000 | $ 2,679,713,000 |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 12.70% | 12.20% |  |
Tier I capital to risk weighted assets: |  |  | 11.40% | 11.20% |  |
Common equity Tier 1 capital: |  |  | 11.40% | 11.20% |  |
Tier I capital to average assets (*): | [1] |  | 9.10% | 10.50% |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | $ 2,055,892,000 | $ 1,906,839,000 |  |
Tier I capital to risk weighted assets: |  |  | 1,541,919,000 | 1,430,129,000 |  |
Common equity Tier 1 capital to risk weighted assets: |  |  | 1,156,439,000 | 1,072,597,000 |  |
Tier I capital to average assets (*): | [1] |  | $ 1,294,033,000 | $ 1,019,210,000 |  |
Minimum Capital Requirement - Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 8.00% | 8.00% |  |
Tier I capital to risk weighted assets: |  |  | 6.00% | 6.00% |  |
Common equity Tier 1 risk based capital to risk weighted assets: |  |  | 4.50% | 4.50% |  |
Tier I capital to average assets (*): | [1] |  | 4.00% | 4.00% |  |
Minimum To Be Well Capitalized |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | $ 2,569,865,000 | $ 2,383,549,000 |  |
Tier I capital to risk weighted assets: |  |  | 2,055,892,000 | 1,906,839,000 |  |
Common equity Tier 1 capital to risk weighted assets: |  |  | 1,670,412,000 | 1,549,307,000 |  |
Tier I capital to average assets (*): | [1] |  | $ 1,617,541,000 | $ 1,274,012,000 |  |
Minimum To Be Well Capitalized - Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 10.00% | 10.00% |  |
Tier I capital to risk weighted assets: |  |  | 8.00% | 8.00% |  |
Common equity Tier 1 capital to risk weighted assets: |  |  | 6.50% | 6.50% |  |
Tier I capital to average assets (*): | [1] |  | 5.00% | 5.00% |  |
Pinnacle Financial |  |  |  |  |  |
Actual Amount |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | $ 3,678,405,000 | $ 3,159,375,000 |  |
Tier I capital to risk weighted assets: |  |  | 2,803,541,000 | 2,319,234,000 |  |
Common Equity Tier 1 capital to risk weighted assets: |  |  | 2,586,292,000 | 2,319,112,000 |  |
Tier I capital to average assets (*): | [1] |  | $ 2,803,541,000 | $ 2,319,234,000 |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 14.30% | 13.20% |  |
Tier I capital to risk weighted assets: |  |  | 10.90% | 9.70% |  |
Common equity Tier 1 capital: |  |  | 10.00% | 9.70% |  |
Tier I capital to average assets (*): | [1] |  | 8.60% | 9.10% |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | $ 2,063,352,000 | $ 1,912,885,000 |  |
Tier I capital to risk weighted assets: |  |  | 1,547,514,000 | 1,434,664,000 |  |
Common equity Tier 1 capital to risk weighted assets: |  |  | 1,160,635,000 | 1,075,998,000 |  |
Tier I capital to average assets (*): | [1] |  | $ 1,298,756,000 | $ 1,021,836,000 |  |
Minimum Capital Requirement - Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 8.00% | 8.00% |  |
Tier I capital to risk weighted assets: |  |  | 6.00% | 6.00% |  |
Common equity Tier 1 risk based capital to risk weighted assets: |  |  | 4.50% | 4.50% |  |
Tier I capital to average assets (*): | [1] |  | 4.00% | 4.00% |  |
Minimum To Be Well Capitalized |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | $ 2,579,190,000 | $ 2,391,106,000 |  |
Tier I capital to risk weighted assets: |  |  | $ 2,063,352,000 | $ 1,912,885,000 |  |
Minimum To Be Well Capitalized - Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  |  | 10.00% | 10.00% |  |
Tier I capital to risk weighted assets: |  |  | 8.00% | 8.00% |  |
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants |  |  | $ 217,126,000 | $ 0 | $ 0 |
[1] | (*) Average assets for the above calculations were based on the most recent quarter.

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