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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets: |  |  |
Securities purchased with agreement to resell |  | $ 500,000 | $ 0
Securities held-to-maturity |  | 1,014,407 | 1,066,531
Quoted market prices in an active market (Level 1) |  |  |
Financial assets: |  |  |
Securities purchased with agreement to resell |  | 0 |
Securities held-to-maturity |  | 0 | 0
Loans, net |  | 0 | 0
Consumer loans held-for-sale |  | 0 | 0
Commercial loans held-for-sale |  | 0 | 0
Financial liabilities: |  |  |
Deposits and securities sold under agreements to repurchase |  | 0 | 0
Federal Home Loan Bank advances |  | 0 | 0
Subordinated debt and other borrowings |  | 0 | 0
Off-balance sheet instruments: |  |  |
Commitments to extend credit | [1] | 0 | 0
Models with significant observable market parameters (Level 2) |  |  |
Financial assets: |  |  |
Securities purchased with agreement to resell |  | 0 |
Securities held-to-maturity |  | 1,014,407 | 1,066,531
Loans, net |  | 0 | 0
Consumer loans held-for-sale |  | 55,763 | 89,625
Commercial loans held-for-sale |  | 49,556 | 31,841
Financial liabilities: |  |  |
Deposits and securities sold under agreements to repurchase |  | 0 | 0
Federal Home Loan Bank advances |  | 0 | 0
Subordinated debt and other borrowings |  | 0 | 0
Off-balance sheet instruments: |  |  |
Commitments to extend credit | [1] | 0 | 0
Models with significant unobservable market parameters (Level 3) |  |  |
Financial assets: |  |  |
Securities purchased with agreement to resell |  | 486,315 |
Securities held-to-maturity |  | 0 | 0
Loans, net |  | 22,804,075 | 22,407,546
Consumer loans held-for-sale |  | 0 | 0
Commercial loans held-for-sale |  | 0 | 0
Financial liabilities: |  |  |
Deposits and securities sold under agreements to repurchase |  | 28,558,710 | 26,929,142
Federal Home Loan Bank advances |  | 938,917 | 1,189,035
Subordinated debt and other borrowings |  | 531,587 | 677,521
Off-balance sheet instruments: |  |  |
Commitments to extend credit | [1] | 24,255 | 24,887
Carrying/ Notional Amount |  |  |
Financial assets: |  |  |
Securities purchased with agreement to resell |  | 500,000 |
Securities held-to-maturity |  | 989,237 | 1,028,359
Loans, net |  | 22,789,826 | 22,139,451
Consumer loans held-for-sale |  | 55,273 | 87,821
Commercial loans held-for-sale |  | 49,121 | 31,200
Financial liabilities: |  |  |
Deposits and securities sold under agreements to repurchase |  | 29,518,047 | 27,833,739
Federal Home Loan Bank advances |  | 888,493 | 1,087,927
Subordinated debt and other borrowings |  | 542,712 | 670,575
Off-balance sheet instruments: |  |  |
Commitments to extend credit | [1] | 11,627,405 | 9,692,607
Estimated Fair Value |  |  |
Financial assets: |  |  |
Securities purchased with agreement to resell | [2] | 486,315 |
Securities held-to-maturity | [2] | 1,014,407 | 1,066,531
Loans, net | [2] | 22,804,075 | 22,407,546
Consumer loans held-for-sale | [2] | 55,763 | 89,625
Commercial loans held-for-sale | [2] | 49,556 | 31,841
Financial liabilities: |  |  |
Deposits and securities sold under agreements to repurchase | [2] | 28,558,710 | 26,929,142
Federal Home Loan Bank advances | [2] | 938,917 | 1,189,035
Subordinated debt and other borrowings | [2] | 531,587 | 677,521
Off-balance sheet instruments: |  |  |
Commitments to extend credit | [1],[2] | $ 24,255 | $ 24,887
[1] | At the end of each quarter, 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 September 30, 2021 and December 31, 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 September 30, 2021 and December 31, 2020 are unamortized fees related to these commitments of $1.8 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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