Loans - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,206,004	$ 6,135,979
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	41,673	39,840
Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,403	21,386
Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	20,270	18,454
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,164,331	6,096,139
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,283,722	5,319,002
Real estate \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	35,253	34,959
Real estate \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,905	18,438
Real estate \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,348	16,521
Real estate \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,248,469	5,284,043
Real estate \| Residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,740,441	1,640,428
Real estate \| Residential properties \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	20,340	19,924
Real estate \| Residential properties \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,029	12,938
Real estate \| Residential properties \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,311	6,986
Real estate \| Residential properties \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,720,101	1,620,504
Real estate \| Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	480,518	534,366
Real estate \| Construction and land development \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,534	4,639
Real estate \| Construction and land development \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	655	1,131
Real estate \| Construction and land development \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,879	3,508
Real estate \| Construction and land development \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	477,984	529,727
Real estate \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	318,915	307,372
Real estate \| Farmland \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,203	3,077
Real estate \| Farmland \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,130	1,299
Real estate \| Farmland \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,073	1,778
Real estate \| Farmland \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	315,712	304,295
Real estate \| Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,743,848	2,836,836
Real estate \| Other commercial \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,176	7,319
Real estate \| Other commercial \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,091	3,070
Real estate \| Other commercial \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,085	4,249
Real estate \| Other commercial \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,734,672	2,829,517
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	687,372	603,828
Commercial and industrial loans \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,384	3,124
Commercial and industrial loans \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,898	1,948
Commercial and industrial loans \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,486	1,176
Commercial and industrial loans \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	682,988	600,704
Commercial and industrial loans \| Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	480,518	534,366
Commercial and industrial loans \| Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,743,848	2,836,836
Agricultural production and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	121,359	100,839
Agricultural production and other loans to farmers \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,486	1,062
Agricultural production and other loans to farmers \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	148	419
Agricultural production and other loans to farmers \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,338	643
Agricultural production and other loans to farmers \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	119,873	99,777
Agricultural production and other loans to farmers \| Farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	318,915	307,372
Consumer and other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	113,551	112,310
Consumer and other loans \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	550	695
Consumer and other loans \| Past Due 30-89 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	452	581
Consumer and other loans \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	98	114
Consumer and other loans \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 113,001	$ 111,615

BANCPLUS CORP 10-Q