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Regulatory Matters (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | 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 |  | $ 833,130,000 | $ 519,144,000 |  |  |
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries |  | $ 83,100,000 |  |  |  |
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 |  | $ 510,200,000 |  |  |  |
Actual Amount |  |  |  |  |  |
Total capital to risk weighted assets: |  | 2,432,419,000 | 2,134,344,000 |  |  |
Tier I capital to risk weighted assets: |  | 2,218,003,000 | 1,936,313,000 |  |  |
Common Equity Tier I Capital to risk weighted assets |  | 2,217,880,000 | 1,936,209,000 |  |  |
Tier I capital to average assets (*): | [1] | $ 2,218,003,000 | $ 1,936,313,000 |  |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  | 11.5414% | 11.3471% |  |  |
Tier I capital to risk weighted assets: |  | 10.524% | 10.2943% |  |  |
Common Equity Tier I Capital to Risk Weighted Assets |  | 10.5235% | 10.2938% |  |  |
Tier I capital to average assets (*): | [1] | 9.80% | 9.7273% |  |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  | $ 1,686,046,000 | $ 1,504,765,000 |  |  |
Tier I capital to risk weighted assets: |  | 1,264,535,000 | 1,128,574,000 |  |  |
Common Equity Tier I Risk Based Capital to risk weighted assets |  | 948,401,000 | 846,430,000 |  |  |
Tier I capital to average assets (*): | [1] | $ 906,185,000 | $ 796,235,000 |  |  |
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 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: |  | $ 2,107,558,000 | $ 1,880,956,000 |  |  |
Tier I capital to risk weighted assets: |  | 1,686,046,000 | 1,504,765,000 |  |  |
Common Equity Tier I capital to risk weighted assets |  | 1,369,912,000 | 1,222,621,000 |  |  |
Tier I capital to average assets (*): | [1] | $ 1,132,731,000 | $ 995,294,000 |  |  |
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 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: |  | $ 2,580,143,000 | $ 2,266,161,000 |  |  |
Tier I capital to risk weighted assets: |  | 2,024,193,000 | 1,725,323,000 |  |  |
Common Equity Tier I Capital to risk weighted assets |  | 2,024,070,000 | 1,725,219,000 |  |  |
Tier I capital to average assets (*): | [1] | $ 2,024,193,000 | $ 1,725,323,000 |  |  |
Actual Ratios |  |  |  |  |  |
Total capital to risk weighted assets: |  | 12.2063% | 12.0102% |  |  |
Tier I capital to risk weighted assets: |  | 9.5762% | 9.1438% |  |  |
Common Equity Tier I Capital to Risk Weighted Assets |  | 9.5756% | 9.1433% |  |  |
Tier I capital to average assets (*): | [1] | 8.90% | 8.6497% |  |  |
Minimum Capital Requirement |  |  |  |  |  |
Total capital to risk weighted assets: |  | $ 1,691,017,000 | $ 1,509,496,000 |  |  |
Tier I capital to risk weighted assets: |  | 1,268,263,000 | 1,132,122,000 |  |  |
Common Equity Tier I Risk Based Capital to risk weighted assets |  | 951,197,000 | 849,092,000 |  |  |
Tier I capital to average assets (*): | [1] | $ 909,102,000 | $ 797,861,000 |  |  |
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 I Risk Based Capital to risk weighted assets: |  | 4.50% | 4.50% |  |  |
Tier I capital to average assets (*): | [1] | 4.00% | 4.00% |  |  |
[1] | (*) Average assets for the above calculations were based on the most recent quarter.

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- Definition The Common Equity Tier I capital ratio (Common Equity Tier I capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum amount of Common Equity Tier I Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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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=84167132&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=84167132&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=84167132&loc=SL5958568-112826 + Details
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