| Pay vs Performance Disclosure | 12 Months Ended |
| Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) |
| Pay vs Performance Disclosure [Table] | | | |
| Pay vs Performance [Table Text Block] | Year Summary Compensation Table Total for Compensation Actually Paid to M. Terry Turner¹˒²˒³ Average Summary Compensation Table Total for Non-PEO NEOs 1 ($) Average Compensation Actually Paid to Non-PEO NEOs 1,2,3 ($) Value of Initial Fixed $100 Investment based on: 4 Net Income TBV Accretion⁵ TSR Peer Group TSR (a) (b) (c) (d) (e) (f) (g) (h) (i) 2022 10,891,661 1,868,022 6,436,622 1,432,359 118.52 116.10 560,742 5.1% 2021 6,826,962 16,108,634 3,684,459 7,899,479 152.58 124.74 527,323 14.2% 2020 4,386,838 (1,689,066) 2,447,282 (534,859) 102.05 91.29 312,321 14.8% | | |
| Named Executive Officers, Footnote [Text Block] | M. Terry Turner was our PEO for each year presented. The individuals comprising the Non-PEO named executive officers for each year presented are listed below. 2020 - 2022 Robert A. McCabe Richard D. Callicutt Hugh M. Queener Harold R. Carpenter | | |
| Peer Group Issuers, Footnote [Text Block] | The Peer Group TSR set forth in this table utilizes the KBW Regional Bank Index (“KRX”), which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2022. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the KRX, respectively and that all dividends were reinvested. Historical stock performance is not necessarily indicative of future stock performance. | | |
| PEO Total Compensation Amount | $ 10,891,661 | $ 6,826,962 | $ 4,386,838 |
| PEO Actually Paid Compensation Amount | $ 1,868,022 | 16,108,634 | (1,689,066) |
| Adjustment To PEO Compensation, Footnote [Text Block] | Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards columns set forth in the Summary Compensation Table. Amounts in the Exclusion of Change in Pension Value column reflect the amounts attributable to the Change in Pension Value reported in the Summary Compensation Table. There was no pension service cost for services rendered during any listed year, as reflected in the tables below. Year Summary Exclusion Exclusion Inclusion Inclusion Compensation Actually Paid to 2022 10,891,661 — (7,994,640) — (1,028,999) 1,868,022 2021 6,826,962 — (3,710,507) — 12,992,179 16,108,634 2020 4,386,838 — (2,517,253) — (3,558,651) (1,689,066) Year Average Summary Average Exclusion Average Exclusion Average Inclusion Average Inclusion Average 2022 6,436,622 (110,912) (4,676,704) — (216,647) 1,432,359 2021 3,684,459 (129,566) (1,741,150) — 6,085,736 7,899,479 2020 2,447,282 (122,045) (1,191,344) — (1,668,752) (534,859) The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables: Year Year-End Fair Value of Change in Fair Value from Change in Fair Value from Total - Inclusion of Equity 2022 3,840,520 (4,391,854) (477,665) (1,028,999) 2021 7,455,667 5,204,446 332,066 12,992,179 2020 — (3,436,701) (121,950) (3,558,651) Year Average Year-End Fair Average Change in Fair Average Change in Fair Total - Average 2022 2,076,177 (2,062,669) (230,155) (216,647) 2021 3,487,342 2,484,090 114,304 6,085,736 2020 — (1,616,075) (52,677) (1,668,752) | | |
| Non-PEO NEO Average Total Compensation Amount | $ 6,436,622 | 3,684,459 | 2,447,282 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,432,359 | 7,899,479 | (534,859) |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards columns set forth in the Summary Compensation Table. Amounts in the Exclusion of Change in Pension Value column reflect the amounts attributable to the Change in Pension Value reported in the Summary Compensation Table. There was no pension service cost for services rendered during any listed year, as reflected in the tables below. Year Summary Exclusion Exclusion Inclusion Inclusion Compensation Actually Paid to 2022 10,891,661 — (7,994,640) — (1,028,999) 1,868,022 2021 6,826,962 — (3,710,507) — 12,992,179 16,108,634 2020 4,386,838 — (2,517,253) — (3,558,651) (1,689,066) Year Average Summary Average Exclusion Average Exclusion Average Inclusion Average Inclusion Average 2022 6,436,622 (110,912) (4,676,704) — (216,647) 1,432,359 2021 3,684,459 (129,566) (1,741,150) — 6,085,736 7,899,479 2020 2,447,282 (122,045) (1,191,344) — (1,668,752) (534,859) The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables: Year Year-End Fair Value of Change in Fair Value from Change in Fair Value from Total - Inclusion of Equity 2022 3,840,520 (4,391,854) (477,665) (1,028,999) 2021 7,455,667 5,204,446 332,066 12,992,179 2020 — (3,436,701) (121,950) (3,558,651) Year Average Year-End Fair Average Change in Fair Average Change in Fair Total - Average 2022 2,076,177 (2,062,669) (230,155) (216,647) 2021 3,487,342 2,484,090 114,304 6,085,736 2020 — (1,616,075) (52,677) (1,668,752) | | |
| Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Description of Relationship Between Compensation Actually Paid and Company Total Shareholder Return (“TSR”) The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and the Company’s cumulative TSR over the three most recently completed fiscal years. | | |
| Compensation Actually Paid vs. Net Income [Text Block] | Description of Relationship Between Compensation Actually Paid and Net Income The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and our net income during each of the three most recently completed fiscal years. | | |
| Compensation Actually Paid vs. Company Selected Measure [Text Block] | Description of Relationship Between Compensation Actually Paid and TBV Accretion The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and our TBV Accretion during each of the three most recently completed fiscal years. | | |
| Total Shareholder Return Vs Peer Group [Text Block] | Description of Relationship Between Company TSR and Peer Group TSR The following chart compares our cumulative TSR over each of the three most recently completed fiscal years to that of the KBW Regional Bank Index over the same period. | | |
| Tabular List [Table Text Block] | TBV Accretion Earnings per diluted share Pre-provision net revenue Return on average tangible common equity Classified asset ratio Non-performing asset ratio | | |
| Total Shareholder Return Amount | $ 118.52 | 152.58 | 102.05 |
| Peer Group Total Shareholder Return Amount | 116.10 | 124.74 | 91.29 |
| Net Income (Loss) | $ 560,742 | $ 527,323 | $ 312,321 |
| Company Selected Measure Amount | 5.1 | 14.2 | 14.8 |
| PEO Name | M. Terry Turner | | |
| Additional 402(v) Disclosure [Text Block] | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below. | | |
| Measure [Axis]: 1 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | TBV Accretion | | |
| Non-GAAP Measure Description [Text Block] | We determined TBV Accretion to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2022. As described in the Compensation Discussion and Analysis, TBV Accretion is one of the two peer-relative performance metrics we utilized for purposes of our recurring performance-based restricted stock units granted under our LTI Plan in 2022. Under these awards we measure our TBV Accretion over a 3-year performance period and compare that to the TBV Accretion over that same time period for each member of a peer group selected by our Compensation Committee with the number of performance units being earned by our NEOs based on the Company's TBV Accretion in relation to the peer group. Though TBV Accretion utilized for our LTI Plan is based on a three-year performance period the values included in column (i) are for each of the stated years. TBV Accretion may not have been the most important financial performance measure for years 2021 and 2020 and we may determine a different financial performance measure to be the most important financial performance measure in future years. | | |
| Measure [Axis]: 2 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | Earnings per diluted share | | |
| Measure [Axis]: 3 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | Pre-provision net revenue | | |
| Measure [Axis]: 4 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | Return on average tangible common equity | | |
| Measure [Axis]: 5 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | Classified asset ratio | | |
| Measure [Axis]: 6 | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Measure Name | Non-performing asset ratio | | |
| PEO [Member] | Adjustment, Exclusion Of Change In Pension Value [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | $ 0 | $ 0 | $ 0 |
| PEO [Member] | Adjustment, Exclusion Of Stock Awards [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (7,994,640) | (3,710,507) | (2,517,253) |
| PEO [Member] | Adjustment, Inclusion Of Pension Service Cost [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | 0 | 0 | 0 |
| PEO [Member] | Adjustment, Equity Award Adjustment [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (1,028,999) | 12,992,179 | (3,558,651) |
| PEO [Member] | Equity Awards Granted During The Year, Unvested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | 3,840,520 | 7,455,667 | 0 |
| PEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (4,391,854) | 5,204,446 | (3,436,701) |
| PEO [Member] | Equity Awards Granted In Prior Years, Vested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (477,665) | 332,066 | (121,950) |
| Non-PEO NEO [Member] | Adjustment, Exclusion Of Change In Pension Value [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (110,912) | (129,566) | (122,045) |
| Non-PEO NEO [Member] | Adjustment, Exclusion Of Stock Awards [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (4,676,704) | (1,741,150) | (1,191,344) |
| Non-PEO NEO [Member] | Adjustment, Inclusion Of Pension Service Cost [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | 0 | 0 | 0 |
| Non-PEO NEO [Member] | Adjustment, Equity Award Adjustment [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (216,647) | 6,085,736 | (1,668,752) |
| Non-PEO NEO [Member] | Equity Awards Granted During The Year, Unvested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | 2,076,177 | 3,487,342 | 0 |
| Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Unvested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | (2,062,669) | 2,484,090 | (1,616,075) |
| Non-PEO NEO [Member] | Equity Awards Granted In Prior Years, Vested [Member] | | | |
| Pay vs Performance Disclosure [Table] | | | |
| Adjustment to Compensation Amount | $ (230,155) | $ 114,304 | $ (52,677) |
