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Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | $ 1,066,531 | $ 201,217
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
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 |  | 1,066,531 | 201,217
Loans Receivable, Fair Value Disclosure |  | 0 | 0
Consumer loans held-for-sale |  | 89,625 | 82,986
Commercial loans held-for-sale |  | 31,841 | 17,836
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 |  | 22,407,546 | 19,717,845
Consumer loans held-for-sale |  | 0 | 0
Commercial loans held-for-sale |  | 0 | 0
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 26,929,142 | 19,647,392
Federal Home Loan Bank advances |  | 1,189,035 | 2,078,514
Subordinated debt and other borrowings |  | 677,521 | 712,220
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 24,887 | 3,786
Reported Value Measurement [Member] |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value |  | 1,028,359 | 188,996
Loans Receivable, Fair Value Disclosure |  | 22,139,451 | 19,693,099
Consumer loans held-for-sale |  | 87,821 | 81,820
Commercial loans held-for-sale |  | 31,200 | 17,585
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure |  | 27,833,739 | 20,307,382
Federal Home Loan Bank advances |  | 1,087,927 | 2,062,534
Subordinated debt and other borrowings |  | 670,575 | 749,080
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1] | 9,692,607 | 8,141,920
Estimate of Fair Value Measurement [Member] |  |  |
Financial assets [Abstract] |  |  |
Securities held-to-maturity, fair value | [2] | 1,066,531 | 201,217
Loans Receivable, Fair Value Disclosure | [2] | 22,407,546 | 19,171,845
Consumer loans held-for-sale | [2] | 89,625 | 82,986
Commercial loans held-for-sale | [2] | 31,841 | 17,836
Financial liabilities [Abstract] |  |  |
Deposits and securities sold under agreements to repurchase, fair value disclosure | [2] | 26,929,142 | 19,647,392
Federal Home Loan Bank advances | [2] | 1,189,035 | 2,078,514
Subordinated debt and other borrowings | [2] | 677,521 | 712,220
Off-balance sheet instruments [Abstract] |  |  |
Commitments to extend credit | [1],[2] | $ 24,887 | $ 3,786
[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, 2020 and 2019, Pinnacle Financial included in other liabilities $23.2 million and $2.4 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, 2020 and 2019, are unamortized fees related to these commitments of $1.7 million and $1.4 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=121572278&loc=d3e13433-108611 + Details
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