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Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Financial assets [Abstract] |  |  |  |
Securities held-to-maturity, fair value |  | $ 2,744,946 |  | $ 1,188,049
Securities Purchased under Agreements to Resell |  | 513,276 |  | 1,000,000
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 |  | 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 |  | 2,744,946 |  | 1,188,049
Loans Receivable, Fair Value Disclosure |  | 0 |  | 0
Consumer loans held-for-sale |  | 42,353 |  | 46,288
Commercial loans held-for-sale |  | 21,151 |  | 17,871
Securities Purchased under Agreements to Resell |  | 0 |  | 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 |  | 27,901,662 |  | 23,223,299
Consumer loans held-for-sale |  | 0 |  | 0
Commercial loans held-for-sale |  | 0 |  | 0
Securities Purchased under Agreements to Resell |  | 440,390 |  | 980,543
Financial liabilities [Abstract] |  |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 34,435,447 |  | 30,812,222
Federal Home Loan Bank advances |  | 477,673 |  | 1,006,866
Subordinated debt and other borrowings |  | 430,884 |  | 479,879
Off-balance sheet instruments [Abstract] |  |  |  |
Commitments to extend credit | [1] | 26,780 |  | 24,351
Reported Value Measurement [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Securities held-to-maturity, fair value |  | 3,079,050 |  | 1,155,958
Loans Receivable, Fair Value Disclosure |  | 28,740,940 |  | 23,151,029
Consumer loans held-for-sale |  | 42,237 |  | 45,806
Commercial loans held-for-sale |  | 21,093 |  | 17,685
Securities Purchased under Agreements to Resell |  | 513,276 |  | 1,000,000
Financial liabilities [Abstract] |  |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 35,156,148 |  | 31,457,092
Federal Home Loan Bank advances |  | 464,436 |  | 888,681
Subordinated debt and other borrowings |  | 424,055 |  | 423,172
Off-balance sheet instruments [Abstract] |  |  |  |
Commitments to extend credit | [1] | 16,224,349 |  | 13,063,942
Estimate of Fair Value Measurement [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Securities held-to-maturity, fair value | [2] | 2,744,946 |  | 1,188,049
Loans Receivable, Fair Value Disclosure | [2] | 27,901,662 |  | 23,223,299
Consumer loans held-for-sale | [2] | 42,353 |  | 46,288
Commercial loans held-for-sale | [2] | 21,151 |  | 17,871
Securities Purchased under Agreements to Resell |  | 440,390 | [2] | 980,543
Financial liabilities [Abstract] |  |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure | [2] | 34,435,447 |  | 30,812,222
Federal Home Loan Bank advances | [2] | 477,673 |  | 1,006,866
Subordinated debt and other borrowings | [2] | 430,884 |  | 479,879
Off-balance sheet instruments [Abstract] |  |  |  |
Commitments to extend credit | [1],[2] | $ 26,780 |  | $ 24,351
[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, 2022 and 2021, Pinnacle Financial included in other liabilities $25.0 million and $22.5 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, 2022 and 2021, are unamortized fees related to these commitments of $1.8 million and $1.9 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 https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + 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 https://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 https://asc.fasb.org/extlink&oid=126897435&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 https://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 https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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