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Regulatory Matters - Capital Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 7.00% |
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 8.50% |
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 10.50% |
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 4.00% |
Consolidated [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
CET1 Capital (to Risk Weighted Assets), Actual Amount | $ 3,908,497 | $ 3,681,430
Tier I Capital (to Risk Weighted Assets), Actual Amount | 3,908,497 | 3,681,430
Total Capital (to Risk Weighted Assets), Actual Amount | 4,206,669 | 3,923,052
Tier I Capital (to Average Tangible Assets), Actual Amount | $ 3,908,497 | $ 3,681,430
CET1 Capital (to Risk Weighted Assets), Actual Ratio | 0.1642 | 0.1554
Tier I Capital (to Risk Weighted Assets), Actual Ratio | 0.1642 | 0.1554
Total Capital (to Risk Weighted Assets), Actual Ratio | 0.1767 | 0.1656
Tier I Capital (to Average Tangible Assets), Actual Ratio | 0.1082 | 0.1039
CET1 Capital (to Risk Weighted Assets) , Minimum Required Amount For Capital Adequacy Purposes | $ 1,071,015 | $ 1,065,744
Tier I Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes | 1,428,021 | 1,420,992
Total Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes | 1,904,028 | 1,894,656
Tier I Capital (to Average Tangible Assets), Minimum Required Amount For Capital Adequacy Purposes | $ 1,445,504 | $ 1,417,440
CET1 Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 4.50% | 4.50%
Tier I Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 0.06 | 0.06
Total Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 0.08 | 0.08
Tier I Capital (to Average Tangible Assets), Minimum Required Ratio For Capital Adequacy Purposes | 0.04 | 0.04
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | $ 1,666,024 | $ 1,657,824
Tier I Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | 2,023,029 | 2,013,072
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | 2,499,036 | 2,486,736
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | $ 1,445,504 | $ 1,417,440
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 7.00% | 7.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 8.50% | 8.50%
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 10.50% | 10.50%
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 4.00% | 4.00%
Prosperity Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
CET1 Capital (to Risk Weighted Assets), Actual Amount | $ 3,893,275 | $ 3,665,750
Tier I Capital (to Risk Weighted Assets), Actual Amount | 3,893,275 | 3,665,750
Total Capital (to Risk Weighted Assets), Actual Amount | 4,191,332 | 3,907,375
Tier I Capital (to Average Tangible Assets), Actual Amount | $ 3,893,275 | $ 3,665,750
CET1 Capital (to Risk Weighted Assets), Actual Ratio | 0.1636 | 0.1548
Tier I Capital (to Risk Weighted Assets), Actual Ratio | 0.1636 | 0.1548
Total Capital (to Risk Weighted Assets), Actual Ratio | 0.1762 | 0.165
Tier I Capital (to Average Tangible Assets), Actual Ratio | 0.1078 | 0.1035
CET1 Capital (to Risk Weighted Assets) , Minimum Required Amount For Capital Adequacy Purposes | $ 1,070,586 | $ 1,065,417
Tier I Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes | 1,427,448 | 1,420,556
Total Capital (to Risk Weighted Assets), Minimum Required Amount For Capital Adequacy Purposes | 1,903,264 | 1,894,074
Tier I Capital (to Average Tangible Assets), Minimum Required Amount For Capital Adequacy Purposes | $ 1,445,188 | $ 1,417,269
CET1 Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 4.50% | 4.50%
Tier I Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 0.06 | 0.06
Total Capital (to Risk Weighted Assets), Minimum Required Ratio For Capital Adequacy Purposes | 0.08 | 0.08
Tier I Capital (to Average Tangible Assets), Minimum Required Ratio For Capital Adequacy Purposes | 400 | 0.04
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | $ 1,665,356 | $ 1,657,315
Tier I Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | 2,022,219 | 2,012,454
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | 2,498,035 | 2,485,972
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Amount | $ 1,445,188 | $ 1,417,269
CET1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 7.00% | 7.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 8.50% | 8.50%
Total Capital (to Risk Weighted Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 10.50% | 10.50%
Tier I Capital (to Average Tangible Assets), Minimum Required Plus Capital Conservation Buffer for 2020 Ratio | 4.00% | 4.00%
CET1 Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | $ 1,546,402 | $ 1,538,935
Tier I Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 1,903,264 | 1,894,074
Total Capital (to Risk Weighted Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 2,379,081 | 2,367,593
Tier I Capital (to Average Tangible Assets), Amount To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | $ 1,806,485 | $ 1,771,586
CET1 Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 6.50% | 6.50%
Tier I Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 0.08 | 0.08
Total Capital (to Risk Weighted Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 0.10 | 0.10
Tier I Capital (to Average Tangible Assets), Ratio To Be Categorized As Well Capitalized Under Prompt Corrective Action Provisions | 0.05 | 0.05

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