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Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | $ 1,188,049 | $ 1,066,531
Securities Purchased under Agreements to Resell |  | 1,000,000 | 0
Quoted Market Prices in an Active Market (Level 1) |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | 0 | 0
Loans Receivable, Fair Value Disclosure |  | 0 | 0
Consumer loans held-for-sale |  | 0 | 0
Commercial loans held-for-sale |  | 0 | 0
Securities Purchased under Agreements to Resell |  | 0 |
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 0 | 0
Federal Home Loan Bank advances |  | 0 | 0
Subordinated debt and other borrowings |  | 0 | 0
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 0 | 0
Models with Significant Observable Market Parameters (Level 2) |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | 1,188,049 | 1,066,531
Loans Receivable, Fair Value Disclosure |  | 0 | 0
Consumer loans held-for-sale |  | 46,288 | 89,625
Commercial loans held-for-sale |  | 17,871 | 31,841
Securities Purchased under Agreements to Resell |  | 0 |
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 0 | 0
Federal Home Loan Bank advances |  | 0 | 0
Subordinated debt and other borrowings |  | 0 | 0
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 0 | 0
Models with Significant Unobservable Market Parameters (Level 3) |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | 0 | 0
Loans Receivable, Fair Value Disclosure |  | 23,223,299 | 22,407,546
Consumer loans held-for-sale |  | 0 | 0
Commercial loans held-for-sale |  | 0 | 0
Securities Purchased under Agreements to Resell |  | 980,543 |
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 30,812,222 | 26,929,142
Federal Home Loan Bank advances |  | 1,006,866 | 1,189,035
Subordinated debt and other borrowings |  | 479,879 | 677,521
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 24,351 | 24,887
Reported Value Measurement [Member] |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | 1,155,958 | 1,028,359
Loans Receivable, Fair Value Disclosure |  | 23,151,029 | 22,139,451
Consumer loans held-for-sale |  | 45,806 | 87,821
Commercial loans held-for-sale |  | 17,685 | 31,200
Securities Purchased under Agreements to Resell |  | 1,000,000 |
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 31,457,092 | 27,833,739
Federal Home Loan Bank advances |  | 888,681 | 1,087,927
Subordinated debt and other borrowings |  | 423,172 | 670,575
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 13,063,942 | 9,692,607
Estimate of Fair Value Measurement [Member] |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value | [2] | 1,188,049 | 1,066,531
Loans Receivable, Fair Value Disclosure | [2] | 23,223,299 | 22,407,546
Consumer loans held-for-sale | [2] | 46,288 | 89,625
Commercial loans held-for-sale | [2] | 17,871 | 31,841
Securities Purchased under Agreements to Resell | [2] | 980,543 |
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure | [2] | 30,812,222 | 26,929,142
Federal Home Loan Bank advances | [2] | 1,006,866 | 1,189,035
Subordinated debt and other borrowings | [2] | 479,879 | 677,521
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1],[2] | $ 24,351 | $ 24,887
[1] | At the end of each period, Pinnacle Financial evaluates the inherent risks of the outstanding off-balance sheet commitments, including both commitments for unfunded loans and standby letters of credit. In making this evaluation, Pinnacle Financial utilizes credit loss expectations on funded loans from our allowance for credit losses methodology and evaluates the probability that the outstanding commitment will eventually become a funded loan. As a result, at December 31, 2021 and 2020, Pinnacle Financial included in other liabilities $22.5 million and $23.2 million, respectively, representing expected credit losses on off-balance sheet commitments, which are reflected in the estimated fair values of the related commitments. Also included in the fair values at December 31, 2021 and 2020, are unamortized fees related to these commitments of $1.9 million and $1.7 million, respectively.
[2] | Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)(A)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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