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Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2013
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 |  | $ 1,184,183 | $ 833,130 |  |  |
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries |  | 114,000 |  |  |  |
Dividends Payable, Amount Per Share |  |  | $ 0.16 | $ 0.14 | $ 0.12 | $ 0.08
Pinnacle Bank |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Retained earnings |  | 721,200 |  |  |  |
Actual Amount |  |  |  |  |  |
Total capital to risk weighted assets: |  | 2,906,853 | $ 2,432,419 |  |  |
Tier I capital to risk weighted assets: |  | 2,679,713 | 2,218,003 |  |  |
Common Equity Tier I Capital to risk weighted assets |  | 2,679,590 | 2,217,880 |  |  |
Tier I capital to average assets (*): | [1] | $ 2,679,713 | $ 2,218,003 |  |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  | 12.20% | 11.50% |  |  |
Tier I capital to risk weighted assets: |  | 11.20% | 10.50% |  |  |
Common Equity Tier I Capital to Risk Weighted Assets |  | 11.20% | 10.50% |  |  |
Tier I capital to average assets (*): | [1] | 10.50% | 9.80% |  |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  | $ 1,906,839 | $ 1,686,046 |  |  |
Tier I capital to risk weighted assets: |  | 1,430,129 | 1,264,535 |  |  |
Common Equity Tier I Risk Based Capital to risk weighted assets |  | 1,072,597 | 948,401 |  |  |
Tier I capital to average assets (*): | [1] | $ 1,019,210 | $ 906,185 |  |  |
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 I 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: |  | $ 2,383,549 | $ 2,107,558 |  |  |
Tier I capital to risk weighted assets: |  | 1,906,839 | 1,686,046 |  |  |
Common Equity Tier I capital to risk weighted assets |  | 1,549,307 | 1,369,912 |  |  |
Tier I capital to average assets (*): | [1] | $ 1,274,012 | $ 1,132,731 |  |  |
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 I 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: |  | $ 3,159,375 | $ 2,580,143 |  |  |
Tier I capital to risk weighted assets: |  | 2,319,234 | 2,024,193 |  |  |
Common Equity Tier I Capital to risk weighted assets |  | 2,319,112 | 2,024,070 |  |  |
Tier I capital to average assets (*): | [1] | $ 2,319,234 | $ 2,024,193 |  |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  | 13.20% | 12.20% |  |  |
Tier I capital to risk weighted assets: |  | 9.70% | 9.60% |  |  |
Common Equity Tier I Capital to Risk Weighted Assets |  | 9.70% | 9.60% |  |  |
Tier I capital to average assets (*): | [1] | 9.10% | 8.90% |  |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  | $ 1,912,885 | $ 1,691,017 |  |  |
Tier I capital to risk weighted assets: |  | 1,434,664 | 1,268,263 |  |  |
Common Equity Tier I Risk Based Capital to risk weighted assets |  | 1,075,998 | 951,197 |  |  |
Tier I capital to average assets (*): | [1] | $ 1,021,836 | $ 909,102 |  |  |
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 I 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: |  | $ 2,391,106 | $ 2,113,772 |  |  |
Tier I capital to risk weighted assets: |  | $ 1,912,885 | $ 1,691,017 |  |  |
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% |  |  |
[1] | (*) Average assets for the above calculations were based on the most recent quarter.

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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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