Loans Held for Investment - Aging of Modified Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	$ 300	$ 172
60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	420	686
90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	4,385	1,786
Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	5,105	2,644
Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	4,823	15,948
Commercial real estate \| Non-owner occupied \| 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans		316
Commercial real estate \| Non-owner occupied \| 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	1
Commercial real estate \| Non-owner occupied \| Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	1	316
Commercial real estate \| Non-owner occupied \| Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	1	316
Commercial real estate \| Owner occupied \| 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans		4
Commercial real estate \| Owner occupied \| 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	274
Commercial real estate \| Owner occupied \| Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	274	4
Commercial real estate \| Owner occupied \| Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	274	4
Commercial and industrial
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Loans modified and subsequently charged off	5,100	18,700
Commercial and industrial \| 30-59 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	300	168
Commercial and industrial \| 60-89 Days
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	146	370
Commercial and industrial \| 90 Days or More
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	4,384	1,786
Commercial and industrial \| Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	4,830	2,324
Commercial and industrial \| Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	4,333	15,606
Construction and land development \| Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans	$ 215
1-4 family residential \| Not Past Due
Non-Covered Loans and Allowance for Non-Covered Loan Losses
Modified Loans		$ 22